hillshade hack

src/komap.conf

@@ -8,4 +8,6 @@ db_srid = 900913
 icons_path = /home/gis/mapnik/kosmo/icons/
 world_bnd_path = /home/gis/mapnik/world_boundaries/
 cleantopo_dem_path = /raid/srtm/Full/CleanTOPO2merc.tif
-srtm_dem_path = /raid/srtm/srtmm.vrt
+srtm_dem_path = /raid/srtm/srtmm.vrt
+cleantopo_hs_path = /raid/srtm/Full/CleanTOPO2merchs.tif
+srtm_hs_path = /raid/srtm/srtmhs.vrt

src/komap.py

@@ -76,6 +76,9 @@ libkomapnik.icons_path = config.get("mapnik", "icons_path")
 libkomapnik.world_bnd_path = config.get("mapnik", "world_bnd_path")
 libkomapnik.cleantopo_dem_path = config.get("mapnik", "cleantopo_dem_path")
 libkomapnik.srtm_dem_path = config.get("mapnik", "srtm_dem_path")
+libkomapnik.cleantopo_dem_path = config.get("mapnik", "cleantopo_hs_path")
+libkomapnik.srtm_dem_path = config.get("mapnik", "srtm_hs_path")
+
 
 from libkomapnik import *
 
@@ -276,6 +279,7 @@ if options.renderer == "mapnik":
   bgcolor = style.get_style("canvas", {}, maxzoom)[0].get("fill-color", "")
   opacity = style.get_style("canvas", {}, maxzoom)[0].get("opacity", 1)
   demhack = style.get_style("canvas", {}, maxzoom)[0].get("-x-mapnik-dem-hack", False)
+  hshack = style.get_style("canvas", {}, maxzoom)[0].get("-x-mapnik-hs-hack", False)
 
   if (opacity == 1) and bgcolor:
     mfile.write(xml_start(bgcolor))
@@ -357,6 +361,10 @@ if options.renderer == "mapnik":
       mfile.write(xml_layer("postgis", "polygon", itags, sql, zoom=zoom ))
     else:
       xml_nolayer()
+    
+    if hshack:
+      xml = xml_hillshade(zoom, x_scale)
+      mfile.write(xml)
 
     index_range = range(-6,7)
     full_layering = conf_full_layering

src/libkomapnik.py

@@ -32,7 +32,8 @@ icons_path = ""
 world_bnd_path = ""
 cleantopo_dem_path = ""
 srtm_dem_path = ""
-
+cleantopo_hs_path = ""
+srtm_hs_path = ""
 
 
 substyles = []
@@ -288,6 +289,35 @@ def xml_srtm(zoom, x_scale):
 </Layer>
       """ % (zoom, x_scale, zoom, zoom, srtm_dem_path)
 
+      
+def xml_hillshade(zoom, x_scale):
+  hs_path = cleantopo_hs_path
+  if zoom>6:
+    hs_path = srtm_hs_path
+  return """
+<Style name="hillshade%s">
+  <Rule>%s
+    <RasterSymbolizer opacity="1" scaling="bilinear" mode="multiply">
+      <RasterColorizer  default-mode="linear">
+        <stop value="0"   color="rgba(0,0,0,0.2)" />
+        <stop value="255" color="rgba(255,255,255,0)" />
+      </RasterColorizer>
+    </RasterSymbolizer>
+  </Rule>
+</Style>
+
+<Layer name="ele-hsz%s">
+    <StyleName>hillshade%s</StyleName>
+    <Datasource>
+        <Parameter name="file">%s</Parameter>
+        <Parameter name="type">gdal</Parameter>
+        <Parameter name="band">1</Parameter>
+        <Parameter name="srid">3857</Parameter>
+    </Datasource>
+</Layer>
+      """ % (zoom, x_scale, zoom, zoom, hs_path)
+      
+      
 def xml_hardcoded_arrows():
   return """
   <LineSymbolizer>