I had a similar problem.
It seems that by default; the parameters for the transformation from the
bessel ellipsoid to WGS84 ellipsoid are not set correctly within the
epsg definitions. I solved this by altering the definition for my
projection in the EPSG definition file on my server.
So you should determine if the projection you use (31300) has a
ellipsoid definition other than WGS84 and then look to find what
settings you have to use for "towgs84="
Steven De Vriendt schreef:
I have some data with projected in 31300, when I change my wms
settings to 4326, there's quite some shift in Google Earth. Made a
screenshot at:
http://img516.imageshack.us/img516/1986/shiftex6.jpg
<http://img516.imageshack.us/img516/1986/shiftex6.jpg>
Steven
On Dec 7, 2007 3:40 PM, Milo van der Linden <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
For wms layers to show up in Google Earth, you generate a
groundoverlay. The projection of the mapfile or layers itself is
not so important, as long as the wms service is able to publis in
epsg:4326.
This means that in your map metadata you need to have something like:
METADATA
"wms_title" "My WMS map"
"wms_srs" "EPSG:4326 EPSG:28992"
"wms_onlineresource"
"http://www.myserver.com/cgi-bin/mapserv.exe?map=somemap.map";
<http://www.myserver.com/cgi-bin/mapserv.exe?map=somemap.map>
END
where you separate the supported projections with spaces.
When you create a GroundOverlay, Google generates the following
kml snippet:
Make sure to add the STYLES= to the end of the request or
mapserver will generate a wrong result (this is for my 5.0
installation)
<GroundOverlay>
<name>Terreincontouren</name>
<color>adffffff</color>
<Icon>
<href>
http://www.myserver.com/cgi-bin/mapserv.exe?map=somemap.map&VERSION=1.1.1&REQUEST=GetMap&SRS=EPSG:4326&WIDTH=1024&HEIGHT=1024&LAYERS=aLayer&TRANSPARENT=TRUE&FORMAT=image/png&STYLES=&
<http://www.myserver.com/cgi-bin/mapserv.exe?map=somemap.map&VERSION=1.1.1&REQUEST=GetMap&SRS=EPSG:4326&WIDTH=1024&HEIGHT=1024&LAYERS=aLayer&TRANSPARENT=TRUE&FORMAT=image/png&STYLES=&>;</href>
<viewRefreshMode>onStop</viewRefreshMode>
</Icon>
<LatLonBox>
<north>52.43886219516767</north>
<south>52.19180808173348</south>
<east>5.137624941169889</east>
<west>4.652306951338773</west>
</LatLonBox>
</GroundOverlay>
It is also possible to show a mapserver legend in Google Earth
with the following kml snippet:
<ScreenOverlay>
<visibility>1</visibility>
<name>Legenda - Percelen</name>
<Icon>
<href>http://www.myserver.com/cgi-bin/mapserv.exe?map=somemap.map&VERSION=1.1.1&REQUEST=GetLegendGraphic&LAYER=aLayer&Format=image/png
<http://www.myserver.com/cgi-bin/mapserv.exe?map=somemap.map&VERSION=1.1.1&REQUEST=GetLegendGraphic&LAYER=aLayer&Format=image/png></href>
</Icon>
<overlayXY x="0" y="1" xunits="fraction"
yunits="fraction"/>
<screenXY x="0" y="1" xunits="fraction"
yunits="fraction"/>
<rotationXY x="0.5" y="0.5" xunits="fraction"
yunits="fraction"/>
<size x="-1" y="-1" xunits="pixels" yunits="pixels"/>
</ScreenOverlay>
If you embed these snippets in a kml file, you can see what happens.
Hans Castorp schreef:
Hi to all,
It's possible to visualize wms layers from mapserver using Google
Earth?? I'm trying to do it but I'm always receiving an error
saying that the wms server does not have layer that google earth
could process. I think this could be something about my map file
configuration. Is there any trick??
PD: I'm serving GeoTiff and shape layers.
Thanks in advance.
Hans Castorp
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.5.503 / Virus Database: 269.16.17/1176 - Release Date:
06/12/2007 23:15
--
Milo van der Linden
skype: milovanderlinden
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
http://www.3dsite.nl
De informatie in dit bericht reflecteert mijn persoonlijke mening
en niet die van een bedrijf of instantie. Aan de informatie kunnen
geen rechten worden ontleend. Indien dit bericht onderdeel is van
een forum, mailing-list of community dan gelden automatisch de bij
het betreffende medium behorende voorwaarden. The information in
this message reflects my personal opinion and not that of a
company or public body. All rights reserved.If this message is
contained in a mailing-list or community, the rights on the medium
are automatically adapted.
--
Milo van der Linden
skype: milovanderlinden <skype:milovanderlinden?add>
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
http://www.3dsite.nl
De informatie in dit bericht reflecteert mijn persoonlijke mening en
niet die van een bedrijf of instantie. Aan de informatie kunnen geen
rechten worden ontleend. Indien dit bericht onderdeel is van een forum,
mailing-list of community dan gelden automatisch de bij het betreffende
medium behorende voorwaarden. The information in this message reflects
my personal opinion and not that of a company or public body. All rights
reserved.If this message is contained in a mailing-list or community,
the rights on the medium are automatically adapted.
