X-Git-Url: https://git.openstreetmap.org./chef.git/blobdiff_plain/c8d5d507d85166e5e0f06247084743f49c82c890..fd98b3c103f6e6153e42cc3860f2ed61f1f4c5db:/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 a679ce444..35a04b1b5 100644
--- a/cookbooks/imagery/recipes/gb_os_sv.rb
+++ b/cookbooks/imagery/recipes/gb_os_sv.rb
@@ -42,12 +42,14 @@ cookbook_file "/srv/imagery/common/osstvw_make_diffs" do
 end
 
 imagery_site "os.openstreetmap.org" do
-  aliases ["os.openstreetmap.org.uk"]
+  title "OpenStreetMap - Ordnance Survey OpenData - Street View"
+  aliases ["os.openstreetmap.org", "a.os.openstreetmap.org", "b.os.openstreetmap.org", "c.os.openstreetmap.org", "os.openstreetmap.org.uk", "a.os.openstreetmap.org.uk", "b.os.openstreetmap.org.uk", "c.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?
@@ -58,6 +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?
@@ -68,6 +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?
@@ -78,6 +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?
@@ -88,6 +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"
@@ -98,6 +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"
@@ -108,6 +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"
@@ -118,6 +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"
@@ -128,6 +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"
@@ -138,6 +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"
@@ -148,6 +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"
@@ -158,7 +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"
@@ -169,7 +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"
@@ -186,6 +199,8 @@ imagery_layer "gb_os_sv_diff_2010_04_2010_11" do
   copyright "Contains Ordnance Survey data © Crown copyright and database right 2010"
   extension "os_sv_diff_png"
   url_aliases ["/sv-diff-2010-04-2010-11"]
+  overlay true
+  revision 2
 end
 
 imagery_layer "gb_os_sv_diff_2010_04_2011_05" do
@@ -195,10 +210,10 @@ imagery_layer "gb_os_sv_diff_2010_04_2011_05" do
   copyright "Contains Ordnance Survey data © Crown copyright and database right 2011"
   extension "os_sv_diff_png"
   url_aliases ["/sv-diff-2010-04-2011-05"]
+  overlay true
+  revision 2
 end
 
-=begin
-
 imagery_layer "gb_os_sv_diff_2010_04_2011_11" do
   site "os.openstreetmap.org"
   projection "EPSG:27700"
@@ -206,6 +221,8 @@ imagery_layer "gb_os_sv_diff_2010_04_2011_11" do
   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
+  revision 2
 end
 
 imagery_layer "gb_os_sv_diff_2010_04_2012_05" do
@@ -215,6 +232,8 @@ imagery_layer "gb_os_sv_diff_2010_04_2012_05" do
   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
+  revision 2
 end
 
 imagery_layer "gb_os_sv_diff_2010_04_2012_11" do
@@ -224,6 +243,8 @@ imagery_layer "gb_os_sv_diff_2010_04_2012_11" do
   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
+  revision 1
 end
 
 imagery_layer "gb_os_sv_diff_2010_04_2013_05" do
@@ -233,6 +254,8 @@ imagery_layer "gb_os_sv_diff_2010_04_2013_05" do
   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
+  revision 1
 end
 
 imagery_layer "gb_os_sv_diff_2010_04_2013_11" do
@@ -242,6 +265,8 @@ imagery_layer "gb_os_sv_diff_2010_04_2013_11" do
   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
+  revision 1
 end
 
 imagery_layer "gb_os_sv_diff_2010_04_2014_04" do
@@ -251,636 +276,706 @@ imagery_layer "gb_os_sv_diff_2010_04_2014_04" do
   copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"
   extension "os_sv_diff_png"
   url_aliases ["/sv-diff-2010-04-2014-04"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-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"]
-end
-
-=end
+  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
+#