[OSM-dev] Zeroing or Extending a Hillshade-Tiff

Peter Körner osm-lists at mazdermind.de
Tue Mar 12 18:00:25 UTC 2013


Am 11.03.2013 21:10, schrieb Sven Geggus:
> Peter Körner <osm-lists at mazdermind.de> wrote:
>
>> what way would you choose and wich tools could be used to go that way?
>
> Use the Water-Polygons from openstreetmapdata.com instead of land
> polygons.

That's not that easy for the polar regions, because transforming the 
splittet polygons to the destination projection results in gaps because 
of straigt lines not beeing curved.

For the land there are complete polygons which are used on the 
Antarctica map but there are no complete water polygons, because they 
would be too complex (a huge polygon with 400.000+ holes).

So in order to get this right one would need to modify jochend 
osmcoastline tool to support EPSG:3031 natively, to all corrdinates are 
transformed before splitting and calculating the water polygons.

Peter




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