imagery: next gb_os_sv_diff layers

[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 e4d394d52b10c2f16a46df8941927c8222d0a0cd..7b99213ad71d2c42a716445daddbc76e63756469 100644 (file)
--- a/cookbooks/imagery/recipes/gb_os_sv.rb
+++ b/cookbooks/imagery/recipes/gb_os_sv.rb
@@ -1,3 +1,4 @@
+# coding: utf-8

 #
 # Cookbook Name:: imagery
 # Recipe:: gb_os_sv
 #
 # Cookbook Name:: imagery
 # Recipe:: gb_os_sv


@@ -33,15 +34,25 @@ cookbook_file "/srv/imagery/common/osstvw_process" do
   mode "0755"
 end
 
   mode "0755"
 end
 

+cookbook_file "/srv/imagery/common/osstvw_make_diffs" do
+  source "osstvw_make_diffs"
+  owner "root"
+  group "root"
+  mode "0755"
+end
+

 imagery_site "os.openstreetmap.org" do
 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"
 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"
   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?
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2010" # FIXME: Correct Copyright?

   background_colour "230 246 255" # OSSV Water Blue
   extension "os_sv_png"
   url_aliases ["/sv-2010-04"]
   background_colour "230 246 255" # OSSV Water Blue
   extension "os_sv_png"
   url_aliases ["/sv-2010-04"]


@@ -49,9 +60,10 @@ end
 
 imagery_layer "gb_os_sv_2010_11" do
   site "os.openstreetmap.org"
 
 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"
   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?
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2010" # FIXME: Correct Copyright?

   background_colour "230 246 255" # OSSV Water Blue
   extension "os_sv_png"
   url_aliases ["/sv-2010-11"]
   background_colour "230 246 255" # OSSV Water Blue
   extension "os_sv_png"
   url_aliases ["/sv-2010-11"]


@@ -59,9 +71,10 @@ end
 
 imagery_layer "gb_os_sv_2011_05" do
   site "os.openstreetmap.org"
 
 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"
   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?
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2011" # FIXME: Correct Copyright?

   background_colour "230 246 255" # OSSV Water Blue
   extension "os_sv_png"
   url_aliases ["/sv-2011-05"]
   background_colour "230 246 255" # OSSV Water Blue
   extension "os_sv_png"
   url_aliases ["/sv-2011-05"]


@@ -69,9 +82,10 @@ end
 
 imagery_layer "gb_os_sv_2011_11" do
   site "os.openstreetmap.org"
 
 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"
   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?
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2011" # FIXME: Correct Copyright?

   background_colour "230 246 255" # OSSV Water Blue
   extension "os_sv_png"
   url_aliases ["/sv-2011-11"]
   background_colour "230 246 255" # OSSV Water Blue
   extension "os_sv_png"
   url_aliases ["/sv-2011-11"]


@@ -79,9 +93,10 @@ end
 
 imagery_layer "gb_os_sv_2012_05" do
   site "os.openstreetmap.org"
 
 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"
   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"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2012"

   background_colour "230 246 255" # OSSV Water Blue
   extension "os_sv_png"
   url_aliases ["/sv-2012-05"]
   background_colour "230 246 255" # OSSV Water Blue
   extension "os_sv_png"
   url_aliases ["/sv-2012-05"]


@@ -89,9 +104,10 @@ end
 
 imagery_layer "gb_os_sv_2012_11" do
   site "os.openstreetmap.org"
 
 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"
   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"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2012"

   background_colour "230 246 255" # OSSV Water Blue
   extension "os_sv_png"
   url_aliases ["/sv-2012-11"]
   background_colour "230 246 255" # OSSV Water Blue
   extension "os_sv_png"
   url_aliases ["/sv-2012-11"]


@@ -99,9 +115,10 @@ end
 
 imagery_layer "gb_os_sv_2013_05" do
   site "os.openstreetmap.org"
 
 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"
   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"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2013"

   background_colour "230 246 255" # OSSV Water Blue
   extension "os_sv_png"
   url_aliases ["/sv-2013-05"]
   background_colour "230 246 255" # OSSV Water Blue
   extension "os_sv_png"
   url_aliases ["/sv-2013-05"]


@@ -109,9 +126,10 @@ end
 
 imagery_layer "gb_os_sv_2013_11" do
   site "os.openstreetmap.org"
 
 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"
   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"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2013"

   background_colour "230 246 255" # OSSV Water Blue
   extension "os_sv_png"
   url_aliases ["/sv-2013-11"]
   background_colour "230 246 255" # OSSV Water Blue
   extension "os_sv_png"
   url_aliases ["/sv-2013-11"]


@@ -119,9 +137,10 @@ end
 
 imagery_layer "gb_os_sv_2014_04" do
   site "os.openstreetmap.org"
 
 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"
   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"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"

   background_colour "230 246 255" # OSSV Water Blue
   extension "os_sv_png"
   url_aliases ["/sv-2014-04"]
   background_colour "230 246 255" # OSSV Water Blue
   extension "os_sv_png"
   url_aliases ["/sv-2014-04"]


@@ -129,9 +148,10 @@ end
 
 imagery_layer "gb_os_sv_2014_10" do
   site "os.openstreetmap.org"
 
 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"
   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"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2014"

   background_colour "230 246 255" # OSSV Water Blue
   extension "os_sv_png"
   url_aliases ["/sv-2014-10"]
   background_colour "230 246 255" # OSSV Water Blue
   extension "os_sv_png"
   url_aliases ["/sv-2014-10"]


@@ -139,9 +159,10 @@ end
 
 imagery_layer "gb_os_sv_2015_05" do
   site "os.openstreetmap.org"
 
 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"
   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"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"

   background_colour "230 246 255" # OSSV Water Blue
   extension "os_sv_png"
   url_aliases ["/sv-2015-05"]
   background_colour "230 246 255" # OSSV Water Blue
   extension "os_sv_png"
   url_aliases ["/sv-2015-05"]


@@ -149,10 +170,10 @@ end
 
 imagery_layer "gb_os_sv_2015_11" do
   site "os.openstreetmap.org"
 
 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"
   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"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2015"

   background_colour "230 246 255" # OSSV Water Blue
   extension "os_sv_png"
   url_aliases ["/sv-2015-11"]
   background_colour "230 246 255" # OSSV Water Blue
   extension "os_sv_png"
   url_aliases ["/sv-2015-11"]


@@ -160,11 +181,801 @@ end
 
 imagery_layer "gb_os_sv_2016_04" do
   site "os.openstreetmap.org"
 
 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"
   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"
+  copyright "Contains Ordnance Survey data © Crown copyright and database right 2016"

   background_colour "230 246 255" # OSSV Water Blue
   extension "os_sv_png"
   url_aliases ["/sv-2016-04", "/sv"] # Add "/sv" to current edition for backward compatibility
 end
   background_colour "230 246 255" # OSSV Water Blue
   extension "os_sv_png"
   url_aliases ["/sv-2016-04", "/sv"] # Add "/sv" to current edition for backward compatibility
 end

+
+# Diff layers
+imagery_layer "gb_os_sv_diff_2010_04_2010_11" do
+  site "os.openstreetmap.org"
+  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"
+  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
+  site "os.openstreetmap.org"
+  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"
+  extension "os_sv_diff_png"
+  url_aliases ["/sv-diff-2010-04-2011-05"]
+  overlay true
+  revision 2
+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
+  revision 2
+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
+  revision 2
+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
+  revision 1
+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
+  revision 1
+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
+  revision 1
+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
+#