More patterns to SVG

landcover.mss

@@ -651,7 +651,7 @@
     [natural = 'beach'],
     [natural = 'shoal'] {
       [surface = 'sand'] {
-        polygon-pattern-file: url('symbols/beach.svg');
+        polygon-pattern-file: url('symbols/beach.png');
         polygon-pattern-alignment: global;
       }
       [surface = 'gravel'],

symbols/generating_patterns/beach.md

@@ -1,9 +1,9 @@
-Pattern file for forests is generated in two steps.
+Pattern file for beach is generated in two steps.
 
-In the first step visit [jsdotpattern (command sequence is recorded)](http://www.imagico.de/map/jsdotpattern.php#x,128,jdp59980;g,2.25,16,16;rx,250,2,8,8;rx,250,2,8,8;s,jdp58799;s,jdp49103;rx,250,2,8,8;rd,0,0,1,scree,0.1,5,10,0,jdp55873,9a9a9a,fff1ba)
+In the first step visit [jsdotpattern (command sequence is recorded)](http://www.imagico.de/map/jsdotpattern.php#x,128,jdp59980;g,2.25,16,16;rx,250,2,8,8;rx,250,2,8,8;s,jdp58799;s,jdp49103;rx,250,2,8,8;rd,0,0,1,scree,0.1,5,10,0,jdp31724,dbb677,fff1ba;)
 
-Generate file - use "render (px aligned)" followed by using "get pattern SVG data" (it is expected that background will be transparent, background colour in jsdotpattern is only for display).
+Use "get pattern SVG data" (it is expected that background will be transparent, background colour in jsdotpattern is only for display).
 
 Generated SVG image is sanitized for use with Mapnik by the script svg_pattern.sh from the jsdotpattern repository at https://github.com/imagico/jsdotpattern.
 
-The final file is beach.svg
+The final file is beach.svg

symbols/generating_patterns/reef.md

@@ -0,0 +1,9 @@
+
+The reef patterns are rasterized and colored versions of the provided SVG
+
+```
+convert -depth 8 reef.svg reef_raw.png
+
+convert -depth 8 -size 256x256 xc:"#969696" \( reef_raw.png -negate \) -set colorspace RGB -alpha Off -compose CopyOpacity -composite -set colorspace sRGB +gamma - beach_coarse.png
+convert -depth 8 -size 256x256 xc:"#549ccd" \( reef_raw.png -negate \) -set colorspace RGB -alpha Off -compose CopyOpacity -composite -set colorspace sRGB +gamma - reef.png
+```