[mkgmap-dev] mapnik TYP, forest and wetland

Mon Nov 2 15:55:59 GMT 2020

Hi.

In the example mapnik.txt TYP file, the draworder of the polygons for woods/
forest 0x50 and wetland 0x51 are given like this:

[_drawOrder]
..
Type=0x050,3
..
Type=0x051,2
..
[End]

When compiling a map, this means that wetlands in forests are not visible if 
this TYP is used.

I tried makling a map using the same draworder
Type=0x050,2
Type=0x051,2
plus using the option --order-by-decreasing-area

This makes the wetland visible in forests.
I could not see any negative impacts of this in the areas which i checked (a 
few in Sweden and Norway). Wetlands over other areas seems to work fine as 
well.

Do you think such a change would be of help or is there a great risk that this 
type of change would impact negatively on the drawing of the maps?

Regards
Karl