[MapServer-dev] Rendering Openstreetmap data in Mapserver

[Tamas Szekeres]

Hi Devs,

I'm trying to create a vector based map for the openstreetmap data in
Mapserver by utilizing the mapnik styles provided by the openstreetmap-carto
<https://github.com/openstreetmap-carto/openstreetmap-carto> project. So
far, I could achieve a very good result and the map looks is very similar
to the online OSM at all scales, however the only thing I cannot replicate
is the concept of the *[way_pixels]* attribute conditions, where the
feature’s area in pixels at the current map scale should be the part of the
class expressions. I don't see such an option in Mapserver as it stands
now, but supporting the already existing *[map_cellsize] *would be a very
close solution I think, however that is only implemented for the
GEOMTRANSFORM expressions actually.

For example the mapnik style expression

[way_pixels] > 750

could be provided in a MapServer CLASS expression as somehing like:

[way_area] > 750 * [map_cellsize] * [map_cellsize]

Would that be reasonable to implement *[map_cellsize]* in the CLASS
expressions?

Best regards,

Tamas
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