[OSM-dev] [Merkaartor] problems w/ some WMS-Servers

Chris Browet cbro at semperpax.com
Fri Feb 27 13:51:18 GMT 2009


There's definitely something strange...

If you execute those 2 requests in a browser:
http://www.geoserver.nrw.de/GeoOgcWms1.3/servlet/DTK10?SERVICE=WMS&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&LAYERS=Raster:DTK10:Dtk10G&SRS=EPSG:4326&STYLES=,&FORMAT=image/png&TRANSPARENT=TRUE&WIDTH=256&HEIGHT=256&BBOX=6.72913,51.5808,6.73462,51.5836
http://www.geoserver.nrw.de/GeoOgcWms1.3/servlet/DTK10?SERVICE=WMS&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&LAYERS=Raster:DTK10:Dtk10G&SRS=EPSG:4326&STYLES=,&FORMAT=image/png&TRANSPARENT=TRUE&WIDTH=256&HEIGHT=256&BBOX=6.72913,51.5836,6.73462,51.5863

By the bbox, you'll see that one is supposed to be exactly above the other.

What we actually get, is 2 overlapping images by some measure??

- Chris -

On Fri, Feb 27, 2009 at 10:33 AM, kannix <test at grade.de> wrote:

> Chris Browet schrieb:
>  > Apparently, this one would not properly handle EPGS:4326
>  >
> (
> http://homepage.mac.com/berbie/TrailRunner/blog/files/0b2bb7409517fcb29d06affed8e0d85d-138.html
> ,
>
>  > old though...), which is the only projection currently supported in
>  > Merkaartor.
>
> The server does support EPGS:4326.
>
> Using a packet sniffer, I noticed this behavior of Merkaartor:
>
> I requested tiles from the mentioned server 'DTK10' and from this
> perfectly working one ('DGK05'):
>
> Name: DTK10
> Server address: www.geoserver.nrw.de
> Main Path: /GeoOgcWms1.3/servlet/DTK10?
> Layers: Raster:DTK10:Dtk10G
> Projection: EPSG:4326
> Styles: ,
> Image Format: image/png
>
> Name: DGK05
> Server address: www.wms.nrw.de
> Main Path: /geobasis/adv_dgk5?
> Layers: Grundriss,Hoehen
> Projection: EPSG:4326
> Styles: ,
> Image Format: image/png
>
> DGK05:
> Request:
> WIDTH=256 HEIGHT=256
> bbox: "6.85272217","51.58081055","6.85546875","51.58218384"
> requested bbox-area approx. 190x152 m
> HTTP Response header:
> HTTP/1.1 200 OK
> Date: Fri, 27 Feb 2009 08:18:27 GMT
> Server: Apache
> Transfer-Encoding: chunked
> Content-Type: image/png
>
>
> DTK10:
> Request:
> WIDTH=256 HEIGHT=256
> bbox: "6.84997559","51.58081055","6.85546875","51.58355713"
> requested bbox-area approx. 379x305 m
> HTTP Response header:
> HTTP/1.1 200 OK
> Date: Fri, 27 Feb 2009 08:21:13 GMT
> Server: Apache/2.0.49 (Win32) mod_jk2/2.0.4 mod_jk/1.2.4
> Last-Modified: Fri, 27 Feb 2009 08:20:49 GMT
> Cache-Control: post-check=0, pre-check=0
> Pragma: no-cache
> Content-Length: 4509
> Servlet-Engine: Tomcat Web Server/3.3a Final ( JSP 1.1; Servlet 2.2 )
> Content-Type: image/png
>
> JOSM asks in both cases for exactly the same tiles (and displays them
> correctly ;-)
> bbox: "6.8532605","51.5806716","6.8540861","51.5814972"
> width=500 height=499
> requested bbox-area approx. 57x91 m
>
> Hope this helps, Dirk
>
>
> _______________________________________________
> Merkaartor mailing list
> Merkaartor at openstreetmap.org
> http://lists.openstreetmap.org/listinfo/merkaartor
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/dev/attachments/20090227/c5cf1f91/attachment.html>


More information about the dev mailing list