[ka-Map-users] queryByAttributes and projection

Mike Adair madair at dmsolutions.ca
Thu Mar 19 12:24:11 EST 2009

You can also re-project the coordinates on the client using Proj4js 


Bistrais, Bob wrote:
> (Cross-posted to the Mapserver list)…
> I have a modified ka-map application with some customized search 
> tools. One of these tools allows the user to pick a town from a 
> dropdown and zoom to it. This uses a queryByAttributes process and it 
> was working well.
> The data for the project is projected in UTM in its native format. The 
> customer asked if we could display the data in lat/long (EPSG:4326). 
> If I change the projection and extent in the .Map files, the map 
> displays properly, but the search tools no longer function, I get a 
> "no matching results" error.
> This seems pretty strange, as I am only querying by attributes, not 
> spatially. So I wouldn't think projection would be an issue. But 
> apparently it is. Does anyone have some insight as to how I can 
> correct this (other than reprojecting the data)?
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   Michael Adair
   Senior Software Architect
   DM Solutions Group Inc.

   Office: (613) 565-5056 x26
   madair at dmsolutions.ca

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