[mapserver-users] MapServer Projection Issues (I think).

[Milo van der Linden]

.... projections....projections... it is what differentiates a
geo-specialist from a "regular" programmer

Hello Jelmer,


The wgs84 layer is correct because the ellipsoid/spheroid is the same as
used by the mercator projection.

We in the Netherlands use the Bessel ellipsoid on our
Rijksdriehoekstelsel so you need a +towgs84 transformation too..

http://blog.openstreetmap.nl/index.php/2009/08/27/woorden-schieten-tekort/

Good luck!

Milo van der Linden


Jelmer Baas schreef:
> Hello List,
>
> I've been struggling with OpenLayers and MapServer while using Google
> Maps as a backgroundlayer (thus using Spherical Mercator projection).
> I've been able to figure it out quite well, but I seem to be stuck at a
> reprojection issue.
>
> The request from OL is:
> mapserv.exe?map=test.map&LAYERS=layer1%Clayer2&TRANSPARENT=true&SERVICE=
> WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&EXCEPTIONS=application%2Fvnd.og
> c.se_inimage&FORMAT=image%2Fpng&SRS=EPSG%3A900913&BBOX=664084.90082266,6
> 838973.7927063,664696.39704883,6839585.2889324&WIDTH=256&HEIGHT=256
>
> This results in an image such as this:
> http://www.cocontheweb.nl/_ftth/test.png
>
> The black line is the original file, in EPSG:28992 (Amersfoort new) and
> has a projection "init=EPSG:28992" in the map file. The green line has
> the default map file projection ("init=epsg:4326") and the file is saved
> as WGS84 with MapInfo. 
>
> The problem now is that the green line is the correct one, the black
> line is offset. I've checked all relevant declarations in my epsg file,
> they are correct. 
>
> Am I doing something wrong? I hope there is another solution besides
> re-saving all files as WGS84.
>
>
> Thanks in advance for any assistance!
>
> With kind regards,
> Jelmer Baas
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