[ka-Map-users] queryByAttributes and projection

Mike Adair madair at dmsolutions.ca
Thu Mar 19 13:24:40 EST 2009

Include proj4js-compressed.js in a script tag in your HTML file.  You 
probably also want to include projection definition file for your UTM 
projection such as:

<script src="lib/defs/EPSG27563.js"></script>

(substitute the correct EPSG file for you map though)  The contents of 
that file is just the PROJ4 init string as a json object.


Bistrais, Bob wrote:
> Hi Mike,
> This looks interesting.  I'm looking at the user guide, but don't see
> where to place it in Ka-Map.  Do I include it in one of the .php files?
> Or the main html file? 
> -----Original Message-----
> From: Mike Adair [mailto:madair at dmsolutions.ca] 
> Sent: Thursday, March 19, 2009 1:24 PM
> To: Bistrais, Bob
> Cc: ka-map-users at lists.maptools.org
> Subject: Re: [ka-Map-users] queryByAttributes and projection
> You can also re-project the coordinates on the client using Proj4js
> (http://trac.osgeo.org/proj4js/).
> Mike
> 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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