Author: nigelbee
[Added to the original trac issue at 8.08pm, Sunday, 11th January 2009]

A new rule needs to be added after the [natural]='wood' rule:

    <Rule>
      <MaxScaleDenominator>500000</MaxScaleDenominator>
      <Filter>[natural] = 'marsh'</Filter>
      <PolygonPatternSymbolizer file= "c:/mapnik/symbols/marsh.png" type="png" width="30" height="30"/>
    </Rule>

I enclose a marsh.png file, prepared from the Osmarender SVG pattern but converted into a 30px * 30px .png file with a transparent background.

Author: steve8[at]mdx.ac.uk
[Added to the original trac issue at 8.35pm, Sunday, 11th January 2009]

OK to do in theory, but mapnik does not respect "layer" as such. Needs to be explicitly filtered for. As it stands the tagging at LWC would not work for mapnik. First point is that areas that are at "ground level" should NOT really be tagged as layer 1 and layer 2. Secondly the areas within areas should be tagged as a multipolygon relation. I will have a look at the png and try it on another area sometime though.

Author: steve8[at]mdx.ac.uk
[Added to the original trac issue at 5.22pm, Thursday, 22nd January 2009]

Done in this week's render. Going to tweak the symbol to get rid of the white bits (next week)