[mkgmap-dev] Water polygons in default style

Fri Jun 5 12:44:47 BST 2015

According to wiki [1] landuse=reservoir and 
natural=water+water=reservoir are equivalent, but the latter (and 
preferred) form is missing in default style.
Another thing to comment is that all water bodies are treated the same 
in default style, despite they can vary from a few square meters (ponds) 
to thousands hectares. I've been playing a bit with area_size() and 
found some values that avoid too small water polygons at certain zoom 
levels in MapSource (it may require some more test though).
Below is current water_polygons file in my style. Do you think it's 
worth including such rules in default style?
landuse=basin|landuse=reservoir & area_size()>125000 [0x3f resolution 18]
landuse=basin|landuse=reservoir & area_size()>35000 [0x3f resolution 20]
landuse=basin|landuse=reservoir [0x3f resolution 22]

natural=bay [0x3d resolution 18]
natural=glacier [0x4d resolution 18]
natural=marsh [0x51 resolution 20]
natural=mud [0x51 resolution 20]
natural=wetland [0x51 resolution 20]
natural=water & water=reservoir & area_size()>125000 [0x3f resolution 18]
natural=water & water=reservoir & area_size()>35000 [0x3f resolution 20]
natural=water & water=reservoir [0x3f resolution 22]
natural=water & area_size()>125000 [0x3c resolution 18]
natural=water & area_size()>35000 [0x3c resolution 20]
natural=water [0x3c resolution 22]
natural=waterfall | waterway=waterfall [0x47 resolution 21]
natural=sea [0x32 resolution 10]

waterway=riverbank [0x46 resolution 20]

[1] http://wiki.openstreetmap.org/wiki/Key:water