Hi there,
I've got some offset when rendering single images using Mapnik.
I've imported an extract of OpenStreetMap-data [1] into my PostGIS
using "osm2pgsql -c -l dortmund.osm", which means: stores as
EPSG:4326 (+proj=latlong +ellps=WGS84 +datum=WGS84) instead of
Spherical Mercator (SM).
"SELECT srid FROM geometry_columns;" returns 4326 as expected.
I've edited the template stylefile [2] to make it work on my
system (correct parth, login to my PostGIS database).
I've also removed the hardcoded extent, which belongs to SM, and
set <Parameter name="estimate_extent">true</Parameter>.
Here is my mapfile, a very simple one: [3]
------------------------------------------------------------------------
#!/usr/bin/python
from mapnik import *
# create map
m = Map(500, 500)
load_map(m, 'osm.xml')
# set map-buffer to avoid labeling problems at edges
m.buffer_size = 250
bbox = Envelope(7.50273893442,51.4803224939,7.50978821362,51.4849072287)
m.zoom_to_box(bbox)
im = Image(m.width, m.height)
render(m, im)
im.save('test.png', 'png')
------------------------------------------------------------------------
It creates this image: [4]
But this image doesn't have the correct bbox / extent.
This is what it should look like: [5] (this source is accurate).
Could anyone please tell me, what I am doing wrong?
I'm running Mapnik v0.6.1 with proj.4 v4.6.1 on Debian Testing.
Same problem occures on latest Mapnik from SVN.
Best regards,
Tobias
References:
[1] 2.65 MB, 7zip: http://depot.tu-dortmund.de/get/7fqz7k
[2]
http://svn.openstreetmap.org/applications/rendering/mapnik/osm-template.xml
[3] http://pastebin.com/m7e2de5b5
[4] http://depot.tu-dortmund.de/get/e2yx5r
[5] http://tiny.cc/m01
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