artemp/tickets2issues — Issue #417: Mapnik's default Proj.4 srs should include +ellps and +no_defs?
Author: artemp
Created: 2011-10-11 15:16:23+00:00
State: open
Labels: Core_Library

I just noticed that QGIS stores its default 4326 projection as:

{{{
"+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs"
}}}

Also, sr.org has that same proj4 string for epsg 4326 (coming from GDAL):

http://spatialreference.org/ref/epsg/4326/proj4/

while Mapnik defaults to:
{{{
'+proj=latlong +datum=WGS84'
}}}

Here: source:trunk/src/map.cpp#L53

Any reason not to use the full Proj.4 for Mapnik's default?