Re: [UMN_MAPSERVER-USERS] Google Earth

[Milo van der Linden]

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";
 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&amp;VERSION=1.1.1&amp;REQUEST=GetMap&amp;SRS=EPSG:4326&amp;WIDTH=1024&amp;HEIGHT=1024&amp;LAYERS=aLayer&amp;TRANSPARENT=TRUE&amp;FORMAT=image/png&amp;STYLES=&amp;</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&amp;VERSION=1.1.1&amp;REQUEST=GetLegendGraphic&amp;LAYER=aLayer&amp;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

 


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