Hi list, I just setup an example under https://tomcat1.agroconnect.fh-bingen.de/geoEditor3/googletest.html. Switch on the different layers and you wil see the deifferences.
I have to admit that there are visible "stretching" errors. Thx Carsten Christopher Schmidt schrieb: > On Wed, May 13, 2009 at 05:29:26PM +0200, Dipl. Inf. Carsten Eider wrote: > >> Hi Christopher, >> >> thank you for your useful answers, but...... >> >> Christopher Schmidt schrieb: >> >>> On Wed, May 13, 2009 at 04:56:26PM +0200, Dipl. Inf. Carsten Eider wrote: >>> >>> >>>> Hi list, >>>> >>>> as far as i understood by reading lots of mailings within this list and >>>> spending time on walking through different openlayer pages >>>> there seems to be no solution for using a >>>> wms in epsg:4326 on top of a google EPSG:900913. >>>> >>>> >>> Correct. All raster layers in OpenLayers must be in the same projection. >>> Browsers can not reproject images. Therefore, if you wish to use a >>> raster layer, it must support the projection fo the base layer -- in the >>> case of google, that's spherical mercator. >>> >>> >> why can a wms-layer not transform its coordinates in epsg:900913 to >> epsg:4326 before doing its request for an image? >> okay i never tried it but i suposse this could result in some horrible >> images? >> > > The images don't match. You get 'stretching'. > > 900913 is not a special projection in any particular way. Ask the same > question about a polar projection -- one centered on Antarctica, for > example. North America is a 5 px smudge. Why can't OpenLayers take that > 5 pixel smudge, and turn it into North America -- thedata isn't there. > > >>> >>> >>>> I tried lots of ways to tell my wms-layer to be requesting in EPSG:4326, >>>> but none worked. >>>> my problem ist, that the layers i want to use come from governmental >>>> servers not offering EPSG:900913 >>>> but EPSG:4326 or EPSG:31647. >>>> >>>> >>> Then you can't use them on top of Google Maps without making yourself a >>> reprojecting service. You can use MapServer as a WMS server to 'cascade' >>> -- load and reproject, in this case -- from the remote server. This >>> would mean you would talk to your own MapServer, which would then talk >>> to the government provided WMS. >>> >>> >>> >>>> Can anyone comfirm this situation or show me a solution? >>>> >>>> >>> Yes, I can confirm that you are correct. >>> >>> >>> >>>> Are there any Reprojection-Services available? >>>> >>>> >>> MapServer can act as a reprojection service. >>> >>> >> damn i would prefer geoserver :-) >> > > I know nothing about GeoServer. > > Regards, > -- Mit freundlichen Grüßen / Yours faithfully Carsten Eider Dipl. Inf. (FH) Kompetenzzentrum für Innovative Informationssysteme c/o Fachhochschhule Bingen / University of applied sciences Bingen Berlinstraße 109 55411 Bingen Tel: +49 (0) 6721 / 409-179 Fax: +49 (0) 6721 / 409-158 email: [email protected] Internet: iis.fh-bingen.de
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