imagery: add remainder of os_sv_diff

[chef.git] / cookbooks / imagery / recipes / gb_os_sv.rb

diff --git a/cookbooks/imagery/recipes/gb_os_sv.rb b/cookbooks/imagery/recipes/gb_os_sv.rb
index c6fa2b8c913b40eb7e17b20b6f07f3699ef38ecc..6dd2e98618fa9339d5c575624d21b518fe058a83 100644 (file)
--- a/cookbooks/imagery/recipes/gb_os_sv.rb
+++ b/cookbooks/imagery/recipes/gb_os_sv.rb
@@ -43,12 +43,13 @@ end
 
 imagery_site "os.openstreetmap.org" do
   title "OpenStreetMap - Ordnance Survey OpenData - Street View"
-  aliases ["os.openstreetmap.org.uk"]
+  aliases ["os.osm.org", "os.openstreetmap.org.uk"]
   bbox [[49.85, -10.5], [58.75, 1.9]]
 end
 
 imagery_layer "gb_os_sv_2010_04" do
   site "os.openstreetmap.org"
+  title "April 2010"
   projection "EPSG:27700"
   source "/data/imagery/gb/os-sv/ossv-2010-04-combined.vrt"
   copyright "Contains Ordnance Survey data © Crown copyright and database right 2010" # FIXME: Correct Copyright?
@@ -59,6 +60,7 @@ end
 
 imagery_layer "gb_os_sv_2010_11" do
   site "os.openstreetmap.org"
+  title "November 2010"
   projection "EPSG:27700"
   source "/data/imagery/gb/os-sv/ossv-2010-11-combined.vrt"
   copyright "Contains Ordnance Survey data © Crown copyright and database right 2010" # FIXME: Correct Copyright?
@@ -69,6 +71,7 @@ end
 
 imagery_layer "gb_os_sv_2011_05" do
   site "os.openstreetmap.org"
+  title "May 2011"
   projection "EPSG:27700"
   source "/data/imagery/gb/os-sv/ossv-2011-05-combined.vrt"
   copyright "Contains Ordnance Survey data © Crown copyright and database right 2011" # FIXME: Correct Copyright?
@@ -79,6 +82,7 @@ end
 
 imagery_layer "gb_os_sv_2011_11" do
   site "os.openstreetmap.org"
+  title "November 2011"
   projection "EPSG:27700"
   source "/data/imagery/gb/os-sv/ossv-2011-11-combined.vrt"
   copyright "Contains Ordnance Survey data © Crown copyright and database right 2011" # FIXME: Correct Copyright?
@@ -89,6 +93,7 @@ end
 
 imagery_layer "gb_os_sv_2012_05" do
   site "os.openstreetmap.org"
+  title "May 2012"
   projection "EPSG:27700"
   source "/data/imagery/gb/os-sv/ossv-2012-05-combined.vrt"
   copyright "Contains Ordnance Survey data © Crown copyright and database right 2012"
@@ -99,6 +104,7 @@ end
 
 imagery_layer "gb_os_sv_2012_11" do
   site "os.openstreetmap.org"
+  title "November 2012"
   projection "EPSG:27700"
   source "/data/imagery/gb/os-sv/ossv-2012-11-combined.vrt"
   copyright "Contains Ordnance Survey data © Crown copyright and database right 2012"
@@ -109,6 +115,7 @@ end
 
 imagery_layer "gb_os_sv_2013_05" do
   site "os.openstreetmap.org"
+  title "May 2013"
   projection "EPSG:27700"
   source "/data/imagery/gb/os-sv/ossv-2013-05-combined.vrt"
   copyright "Contains Ordnance Survey data © Crown copyright and database right 2013"
@@ -119,6 +126,7 @@ end
 
 imagery_layer "gb_os_sv_2013_11" do
   site "os.openstreetmap.org"
+  title "November 2013"
   projection "EPSG:27700"
   source "/data/imagery/gb/os-sv/ossv-2013-11-combined.vrt"
   copyright "Contains Ordnance Survey data © Crown copyright and database right 2013"
@@ -129,6 +137,7 @@ end
 
 imagery_layer "gb_os_sv_2014_04" do
   site "os.openstreetmap.org"
+  title "April 2014"
   projection "EPSG:27700"
   source "/data/imagery/gb/os-sv/ossv-2014-04-combined.vrt"
   copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
@@ -139,6 +148,7 @@ end
 
 imagery_layer "gb_os_sv_2014_10" do
   site "os.openstreetmap.org"
+  title "October 2014"
   projection "EPSG:27700"
   source "/data/imagery/gb/os-sv/ossv-2014-10-combined.vrt"
   copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
@@ -149,6 +159,7 @@ end
 
 imagery_layer "gb_os_sv_2015_05" do
   site "os.openstreetmap.org"
+  title "May 2015"
   projection "EPSG:27700"
   source "/data/imagery/gb/os-sv/ossv-2015-05-combined.vrt"
   copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
@@ -159,7 +170,7 @@ end
 
 imagery_layer "gb_os_sv_2015_11" do
   site "os.openstreetmap.org"
-  root_layer true
+  title "November 2015"
   projection "EPSG:27700"
   source "/data/imagery/gb/os-sv/ossv-2015-11-combined.vrt"
   copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
@@ -170,7 +181,8 @@ end
 
 imagery_layer "gb_os_sv_2016_04" do
   site "os.openstreetmap.org"
-  root_layer true
+  title "April 2016"
+  default_layer true
   projection "EPSG:27700"
   source "/data/imagery/gb/os-sv/ossv-2016-04-combined.vrt"
   copyright "Contains Ordnance Survey data © Crown copyright and database right 2016"
@@ -179,9 +191,11 @@ imagery_layer "gb_os_sv_2016_04" do
   url_aliases ["/sv-2016-04", "/sv"] # Add "/sv" to current edition for backward compatibility
 end
 
-# Diff layers
+# ======= Diff layers =======
+
 imagery_layer "gb_os_sv_diff_2010_04_2010_11" do
   site "os.openstreetmap.org"
+  title "Changes April 2010 to November 2010"
   projection "EPSG:27700"
   source "/data/imagery/gb/os-sv/ossv-diff-2010-04-2010-11-combined.vrt"
   copyright "Contains Ordnance Survey data © Crown copyright and database right 2010"
@@ -192,6 +206,7 @@ end
 
 imagery_layer "gb_os_sv_diff_2010_04_2011_05" do
   site "os.openstreetmap.org"
+  title "Changes April 2010 to May 2011"
   projection "EPSG:27700"
   source "/data/imagery/gb/os-sv/ossv-diff-2010-04-2011-05-combined.vrt"
   copyright "Contains Ordnance Survey data © Crown copyright and database right 2011"
@@ -200,764 +215,839 @@ imagery_layer "gb_os_sv_diff_2010_04_2011_05" do
   overlay true
 end
 
-#
-# imagery_layer "gb_os_sv_diff_2010_04_2011_11" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2010-04-2011-11-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2011"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2010-04-2011-11"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2010_04_2012_05" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2010-04-2012-05-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2012"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2010-04-2012-05"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2010_04_2012_11" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2010-04-2012-11-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2012"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2010-04-2012-11"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2010_04_2013_05" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2010-04-2013-05-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2013"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2010-04-2013-05"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2010_04_2013_11" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2010-04-2013-11-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2013"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2010-04-2013-11"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2010_04_2014_04" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2010-04-2014-04-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2010-04-2014-04"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2010_04_2014_10" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2010-04-2014-10-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2010-04-2014-10"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2010_04_2015_05" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2010-04-2015-05-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2010-04-2015-05"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2010_04_2015_11" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2010-04-2015-11-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2010-04-2015-11"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2010_04_2016_04" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2010-04-2016-04-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2016"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2010-04-2016-04"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2010_11_2011_05" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2010-11-2011-05-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2011"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2010-11-2011-05"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2010_11_2011_11" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2010-11-2011-11-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2011"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2010-11-2011-11"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2010_11_2012_05" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2010-11-2012-05-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2012"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2010-11-2012-05"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2010_11_2012_11" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2010-11-2012-11-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2012"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2010-11-2012-11"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2010_11_2013_05" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2010-11-2013-05-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2013"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2010-11-2013-05"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2010_11_2013_11" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2010-11-2013-11-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2013"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2010-11-2013-11"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2010_11_2014_04" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2010-11-2014-04-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2010-11-2014-04"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2010_11_2014_10" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2010-11-2014-10-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2010-11-2014-10"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2010_11_2015_05" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2010-11-2015-05-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2010-11-2015-05"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2010_11_2015_11" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2010-11-2015-11-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2010-11-2015-11"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2010_11_2016_04" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2010-11-2016-04-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2016"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2010-11-2016-04"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2011_05_2011_11" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2011-05-2011-11-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2011"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2011-05-2011-11"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2011_05_2012_05" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2011-05-2012-05-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2012"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2011-05-2012-05"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2011_05_2012_11" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2011-05-2012-11-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2012"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2011-05-2012-11"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2011_05_2013_05" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2011-05-2013-05-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2013"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2011-05-2013-05"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2011_05_2013_11" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2011-05-2013-11-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2013"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2011-05-2013-11"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2011_05_2014_04" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2011-05-2014-04-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2011-05-2014-04"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2011_05_2014_10" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2011-05-2014-10-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2011-05-2014-10"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2011_05_2015_05" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2011-05-2015-05-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2011-05-2015-05"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2011_05_2015_11" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2011-05-2015-11-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2011-05-2015-11"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2011_05_2016_04" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2011-05-2016-04-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2016"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2011-05-2016-04"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2011_11_2012_05" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2011-11-2012-05-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2012"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2011-11-2012-05"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2011_11_2012_11" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2011-11-2012-11-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2012"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2011-11-2012-11"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2011_11_2013_05" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2011-11-2013-05-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2013"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2011-11-2013-05"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2011_11_2013_11" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2011-11-2013-11-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2013"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2011-11-2013-11"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2011_11_2014_04" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2011-11-2014-04-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2011-11-2014-04"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2011_11_2014_10" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2011-11-2014-10-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2011"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2011-11-2014-10"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2011_11_2015_05" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2011-11-2015-05-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2011-11-2015-05"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2011_11_2015_11" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2011-11-2015-11-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2011-11-2015-11"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2011_11_2016_04" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2011-11-2016-04-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2016"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2011-11-2016-04"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2012_05_2012_11" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2012-05-2012-11-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2012"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2012-05-2012-11"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2012_05_2013_05" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2012-05-2013-05-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2013"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2012-05-2013-05"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2012_05_2013_11" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2012-05-2013-11-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2013"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2012-05-2013-11"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2012_05_2014_04" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2012-05-2014-04-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2012-05-2014-04"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2012_05_2014_10" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2012-05-2014-10-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2012-05-2014-10"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2012_05_2015_05" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2012-05-2015-05-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2012-05-2015-05"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2012_05_2015_11" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2012-05-2015-11-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2012-05-2015-11"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2012_05_2016_04" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2012-05-2016-04-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2016"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2012-05-2016-04"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2012_11_2013_05" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2012-11-2013-05-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2013"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2012-11-2013-05"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2012_11_2013_11" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2012-11-2013-11-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2013"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2012-11-2013-11"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2012_11_2014_04" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2012-11-2014-04-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2012-11-2014-04"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2012_11_2014_10" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2012-11-2014-10-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2012-11-2014-10"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2012_11_2015_05" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2012-11-2015-05-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2012-11-2015-05"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2012_11_2015_11" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2012-11-2015-11-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2012-11-2015-11"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2012_11_2016_04" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2012-11-2016-04-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2016"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2012-11-2016-04"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2013_05_2013_11" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2013-05-2013-11-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2013"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2013-05-2013-11"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2013_05_2014_04" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2013-05-2014-04-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2013-05-2014-04"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2013_05_2014_10" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2013-05-2014-10-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2013-05-2014-10"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2013_05_2015_05" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2013-05-2015-05-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2013-05-2015-05"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2013_05_2015_11" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2013-05-2015-11-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2013-05-2015-11"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2013_05_2016_04" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2013-05-2016-04-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2016"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2013-05-2016-04"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2013_11_2014_04" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2013-11-2014-04-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2013-11-2014-04"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2013_11_2014_10" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2013-11-2014-10-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2013-11-2014-10"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2013_11_2015_05" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2013-11-2015-05-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2013-11-2015-05"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2013_11_2015_11" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2013-11-2015-11-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2013-11-2015-11"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2013_11_2016_04" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2013-11-2016-04-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2016"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2013-11-2016-04"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2014_04_2014_10" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2014-04-2014-10-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2014-04-2014-10"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2014_04_2015_05" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2014-04-2015-05-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2014-04-2015-05"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2014_04_2015_11" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2014-04-2015-11-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2014-04-2015-11"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2014_04_2016_04" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2014-04-2016-04-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2016"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2014-04-2016-04"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2014_10_2015_05" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2014-10-2015-05-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2014-10-2015-05"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2014_10_2015_11" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2014-10-2015-11-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2014-10-2015-11"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2014_10_2016_04" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2014-10-2016-04-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2016"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2014-10-2016-04"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2015_05_2015_11" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2015-05-2015-11-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2015-05-2015-11"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2015_05_2016_04" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2015-05-2016-04-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2016"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2015-05-2016-04"]
-#   overlay true
-# end
-#
-# imagery_layer "gb_os_sv_diff_2015_11_2016_04" do
-#   site "os.openstreetmap.org"
-#   projection "EPSG:27700"
-#   source "/data/imagery/gb/os-sv/ossv-diff-2015-11-2016-04-combined.vrt"
-#   copyright "Contains Ordnance Survey data © Crown copyright and database right 2016"
-#   extension "os_sv_diff_png"
-#   url_aliases ["/sv-diff-2015-11-2016-04"]
-#   overlay true
-# end
-#
+imagery_layer "gb_os_sv_diff_2010_04_2011_11" do
+  site "os.openstreetmap.org"
+  title "Changes April 2010 to November 2011"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2010-04-2011-11-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2011"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2010-04-2011-11"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2010_04_2012_05" do
+  site "os.openstreetmap.org"
+  title "Changes April 2010 to May 2012"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2010-04-2012-05-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2012"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2010-04-2012-05"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2010_04_2012_11" do
+  site "os.openstreetmap.org"
+  title "Changes April 2010 to November 2012"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2010-04-2012-11-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2012"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2010-04-2012-11"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2010_04_2013_05" do
+  site "os.openstreetmap.org"
+  title "Changes April 2010 to May 2013"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2010-04-2013-05-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2013"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2010-04-2013-05"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2010_04_2013_11" do
+  site "os.openstreetmap.org"
+  title "Changes April 2010 to November 2013"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2010-04-2013-11-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2013"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2010-04-2013-11"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2010_04_2014_04" do
+  site "os.openstreetmap.org"
+  title "Changes April 2010 to April 2014"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2010-04-2014-04-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2010-04-2014-04"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2010_04_2014_10" do
+  site "os.openstreetmap.org"
+  title "Changes April 2010 to October 2014"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2010-04-2014-10-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2010-04-2014-10"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2010_04_2015_05" do
+  site "os.openstreetmap.org"
+  title "Changes April 2010 to May 2015"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2010-04-2015-05-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2010-04-2015-05"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2010_04_2015_11" do
+  site "os.openstreetmap.org"
+  title "Changes April 2010 to November 2015"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2010-04-2015-11-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2010-04-2015-11"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2010_04_2016_04" do
+  site "os.openstreetmap.org"
+  title "Changes April 2010 to April 2016"
+  default_layer true
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2010-04-2016-04-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2016"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2010-04-2016-04"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2010_11_2011_05" do
+  site "os.openstreetmap.org"
+  title "Changes November 2010 to May 2011"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2010-11-2011-05-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2011"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2010-11-2011-05"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2010_11_2011_11" do
+  site "os.openstreetmap.org"
+  title "Changes November 2010 to November 2011"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2010-11-2011-11-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2011"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2010-11-2011-11"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2010_11_2012_05" do
+  site "os.openstreetmap.org"
+  title "Changes November 2010 to May 2012"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2010-11-2012-05-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2012"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2010-11-2012-05"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2010_11_2012_11" do
+  site "os.openstreetmap.org"
+  title "Changes November 2010 to November 2012"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2010-11-2012-11-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2012"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2010-11-2012-11"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2010_11_2013_05" do
+  site "os.openstreetmap.org"
+  title "Changes November 2010 to May 2013"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2010-11-2013-05-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2013"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2010-11-2013-05"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2010_11_2013_11" do
+  site "os.openstreetmap.org"
+  title "Changes November 2010 to November 2013"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2010-11-2013-11-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2013"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2010-11-2013-11"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2010_11_2014_04" do
+  site "os.openstreetmap.org"
+  title "Changes November 2010 to April 2014"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2010-11-2014-04-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2010-11-2014-04"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2010_11_2014_10" do
+  site "os.openstreetmap.org"
+  title "Changes November 2010 to October 2014"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2010-11-2014-10-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2010-11-2014-10"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2010_11_2015_05" do
+  site "os.openstreetmap.org"
+  title "Changes November 2010 to May 2015"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2010-11-2015-05-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2010-11-2015-05"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2010_11_2015_11" do
+  site "os.openstreetmap.org"
+  title "Changes November 2010 to November 2015"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2010-11-2015-11-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2010-11-2015-11"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2010_11_2016_04" do
+  site "os.openstreetmap.org"
+  title "Changes November 2010 to April 2016"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2010-11-2016-04-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2016"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2010-11-2016-04"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2011_05_2011_11" do
+  site "os.openstreetmap.org"
+  title "Changes May 2011 to November 2011"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2011-05-2011-11-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2011"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2011-05-2011-11"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2011_05_2012_05" do
+  site "os.openstreetmap.org"
+  title "Changes May 2011 to May 2012"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2011-05-2012-05-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2012"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2011-05-2012-05"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2011_05_2012_11" do
+  site "os.openstreetmap.org"
+  title "Changes May 2011 to November 2012"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2011-05-2012-11-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2012"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2011-05-2012-11"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2011_05_2013_05" do
+  site "os.openstreetmap.org"
+  title "Changes May 2011 to May 2013"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2011-05-2013-05-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2013"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2011-05-2013-05"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2011_05_2013_11" do
+  site "os.openstreetmap.org"
+  title "Changes May 2011 to November 2013"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2011-05-2013-11-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2013"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2011-05-2013-11"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2011_05_2014_04" do
+  site "os.openstreetmap.org"
+  title "Changes May 2011 to April 2014"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2011-05-2014-04-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2011-05-2014-04"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2011_05_2014_10" do
+  site "os.openstreetmap.org"
+  title "Changes May 2011 to October 2014"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2011-05-2014-10-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2011-05-2014-10"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2011_05_2015_05" do
+  site "os.openstreetmap.org"
+  title "Changes May 2011 to May 2015"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2011-05-2015-05-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2011-05-2015-05"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2011_05_2015_11" do
+  site "os.openstreetmap.org"
+  title "Changes May 2011 to November 2015"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2011-05-2015-11-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2011-05-2015-11"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2011_05_2016_04" do
+  site "os.openstreetmap.org"
+  title "Changes May 2011 to April 2016"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2011-05-2016-04-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2016"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2011-05-2016-04"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2011_11_2012_05" do
+  site "os.openstreetmap.org"
+  title "Changes November 2011 to May 2012"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2011-11-2012-05-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2012"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2011-11-2012-05"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2011_11_2012_11" do
+  site "os.openstreetmap.org"
+  title "Changes November 2011 to November 2012"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2011-11-2012-11-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2012"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2011-11-2012-11"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2011_11_2013_05" do
+  site "os.openstreetmap.org"
+  title "Changes November 2011 to May 2013"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2011-11-2013-05-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2013"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2011-11-2013-05"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2011_11_2013_11" do
+  site "os.openstreetmap.org"
+  title "Changes November 2011 to November 2013"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2011-11-2013-11-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2013"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2011-11-2013-11"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2011_11_2014_04" do
+  site "os.openstreetmap.org"
+  title "Changes November 2011 to April 2014"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2011-11-2014-04-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2011-11-2014-04"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2011_11_2014_10" do
+  site "os.openstreetmap.org"
+  title "Changes November 2011 to October 2014"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2011-11-2014-10-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2011"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2011-11-2014-10"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2011_11_2015_05" do
+  site "os.openstreetmap.org"
+  title "Changes November 2011 to May 2015"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2011-11-2015-05-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2011-11-2015-05"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2011_11_2015_11" do
+  site "os.openstreetmap.org"
+  title "Changes November 2011 to November 2015"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2011-11-2015-11-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2011-11-2015-11"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2011_11_2016_04" do
+  site "os.openstreetmap.org"
+  title "Changes November 2011 to April 2016"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2011-11-2016-04-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2016"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2011-11-2016-04"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2012_05_2012_11" do
+  site "os.openstreetmap.org"
+  title "Changes May 2012 to November 2012"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2012-05-2012-11-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2012"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2012-05-2012-11"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2012_05_2013_05" do
+  site "os.openstreetmap.org"
+  title "Changes May 2012 to May 2013"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2012-05-2013-05-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2013"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2012-05-2013-05"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2012_05_2013_11" do
+  site "os.openstreetmap.org"
+  title "Changes May 2012 to November 2013"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2012-05-2013-11-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2013"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2012-05-2013-11"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2012_05_2014_04" do
+  site "os.openstreetmap.org"
+  title "Changes May 2012 to April 2014"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2012-05-2014-04-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2012-05-2014-04"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2012_05_2014_10" do
+  site "os.openstreetmap.org"
+  title "Changes May 2012 to October 2014"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2012-05-2014-10-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2012-05-2014-10"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2012_05_2015_05" do
+  site "os.openstreetmap.org"
+  title "Changes May 2012 to May 2015"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2012-05-2015-05-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2012-05-2015-05"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2012_05_2015_11" do
+  site "os.openstreetmap.org"
+  title "Changes May 2012 to November 2015"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2012-05-2015-11-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2012-05-2015-11"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2012_05_2016_04" do
+  site "os.openstreetmap.org"
+  title "Changes May 2012 to April 2016"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2012-05-2016-04-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2016"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2012-05-2016-04"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2012_11_2013_05" do
+  site "os.openstreetmap.org"
+  title "Changes November 2012 to May 2013"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2012-11-2013-05-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2013"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2012-11-2013-05"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2012_11_2013_11" do
+  site "os.openstreetmap.org"
+  title "Changes November 2012 to November 2013"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2012-11-2013-11-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2013"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2012-11-2013-11"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2012_11_2014_04" do
+  site "os.openstreetmap.org"
+  title "Changes November 2012 to April 2014"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2012-11-2014-04-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2012-11-2014-04"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2012_11_2014_10" do
+  site "os.openstreetmap.org"
+  title "Changes November 2012 to October 2014"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2012-11-2014-10-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2012-11-2014-10"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2012_11_2015_05" do
+  site "os.openstreetmap.org"
+  title "Changes November 2012 to May 2015"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2012-11-2015-05-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2012-11-2015-05"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2012_11_2015_11" do
+  site "os.openstreetmap.org"
+  title "Changes November 2012 to November 2015"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2012-11-2015-11-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2012-11-2015-11"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2012_11_2016_04" do
+  site "os.openstreetmap.org"
+  title "Changes November 2012 to April 2016"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2012-11-2016-04-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2016"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2012-11-2016-04"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2013_05_2013_11" do
+  site "os.openstreetmap.org"
+  title "Changes May 2013 to November 2013"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2013-05-2013-11-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2013"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2013-05-2013-11"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2013_05_2014_04" do
+  site "os.openstreetmap.org"
+  title "Changes May 2013 to April 2014"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2013-05-2014-04-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2013-05-2014-04"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2013_05_2014_10" do
+  site "os.openstreetmap.org"
+  title "Changes May 2013 to October 2014"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2013-05-2014-10-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2013-05-2014-10"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2013_05_2015_05" do
+  site "os.openstreetmap.org"
+  title "Changes May 2013 to May 2015"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2013-05-2015-05-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2013-05-2015-05"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2013_05_2015_11" do
+  site "os.openstreetmap.org"
+  title "Changes May 2013 to November 2015"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2013-05-2015-11-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2013-05-2015-11"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2013_05_2016_04" do
+  site "os.openstreetmap.org"
+  title "Changes May 2013 to April 2016"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2013-05-2016-04-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2016"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2013-05-2016-04"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2013_11_2014_04" do
+  site "os.openstreetmap.org"
+  title "Changes November 2013 to April 2014"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2013-11-2014-04-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2013-11-2014-04"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2013_11_2014_10" do
+  site "os.openstreetmap.org"
+  title "Changes November 2013 to October 2014"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2013-11-2014-10-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2013-11-2014-10"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2013_11_2015_05" do
+  site "os.openstreetmap.org"
+  title "Changes November 2013 to May 2015"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2013-11-2015-05-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2013-11-2015-05"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2013_11_2015_11" do
+  site "os.openstreetmap.org"
+  title "Changes November 2013 to November 2015"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2013-11-2015-11-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2013-11-2015-11"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2013_11_2016_04" do
+  site "os.openstreetmap.org"
+  title "Changes November 2013 to April 2016"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2013-11-2016-04-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2016"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2013-11-2016-04"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2014_04_2014_10" do
+  site "os.openstreetmap.org"
+  title "Changes April 2014 to October 2014"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2014-04-2014-10-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2014-04-2014-10"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2014_04_2015_05" do
+  site "os.openstreetmap.org"
+  title "Changes April 2014 to May 2015"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2014-04-2015-05-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2014-04-2015-05"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2014_04_2015_11" do
+  site "os.openstreetmap.org"
+  title "Changes April 2014 to November 2015"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2014-04-2015-11-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2014-04-2015-11"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2014_04_2016_04" do
+  site "os.openstreetmap.org"
+  title "Changes April 2014 to April 2016"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2014-04-2016-04-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2016"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2014-04-2016-04"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2014_10_2015_05" do
+  site "os.openstreetmap.org"
+  title "Changes October 2014 to May 2015"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2014-10-2015-05-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2014-10-2015-05"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2014_10_2015_11" do
+  site "os.openstreetmap.org"
+  title "Changes October 2014 to November 2015"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2014-10-2015-11-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2014-10-2015-11"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2014_10_2016_04" do
+  site "os.openstreetmap.org"
+  title "Changes October 2014 to April 2016"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2014-10-2016-04-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2016"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2014-10-2016-04"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2015_05_2015_11" do
+  site "os.openstreetmap.org"
+  title "Changes May 2015 to November 2015"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2015-05-2015-11-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2015-05-2015-11"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2015_05_2016_04" do
+  site "os.openstreetmap.org"
+  title "Changes May 2015 to April 2016"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2015-05-2016-04-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2016"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2015-05-2016-04"]
+  overlay true
+end
+
+imagery_layer "gb_os_sv_diff_2015_11_2016_04" do
+  site "os.openstreetmap.org"
+  title "Changes November 2015 to April 2016"
+  projection "EPSG:27700"
+  source "/data/imagery/gb/os-sv/ossv-diff-2015-11-2016-04-combined.vrt"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2016"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2015-11-2016-04"]
+  overlay true
+end