[OpenLayers-Users] FW: getFeatureInfo projection

[Alexandre.Laplante at statcan.gc.ca]

Yeah, I added getName because I have multiple layers, and I needed to
know which one is being queried. Should have mentioned that. 

	-----Original Message-----
	From: Dave Winfield [mailto:winfield.dave at gmail.com] 
	Sent: July 21, 2009 12:10 PM
	To: Alexandre.Laplante at statcan.gc.ca
	Subject: Re: [OpenLayers-Users] getFeatureInfo projection
	
	
	I'm not totally sure, but what is map.getName() returning?  You
want it to be the layer that's on your wms layer.
	
	
	On Tue, Jul 21, 2009 at 11:52 AM,
<Alexandre.Laplante at statcan.gc.ca> wrote:
	

		Hello, 

		I have a map in EPSG:42304 projection. I'm trying to
have a getFeatureInfo return information about clicked features, but
there are always 0 results. I'm using mapserver, and when I use a
template header with:
		
		                        <tr> 
		                                 <th>Bounding box</th> 
	
<td>[minx],[miny],[maxx],[maxy]</td> 
		                         </tr> 
		                         <tr> 
		                                 <th>Image
Coordinates</th> 
		                                 <td>[img.x],
[img.y]</td> 
		                         </tr> 
		                         <tr> 
		                                 <th>Map
Coordinates</th> 
		                                 <td>[mapx], [mapy]</td>

		                         </tr> 
		                         <tr> 
		                                 <th>Number of
results</th> 
		                                 <td>[nr]</td> 
		                         </tr> 
		                         <tr> 
		                                 <th>Scale</th> 
		                                 <td>[scale]</td> 
		                         </tr> 
		                         <tr> 
		                                 <th>Cellsize</th> 
		                                 <td>[cellsize]</td> 
		                         </tr> 

		I get back something like: 
		
		Bounding box
1593723.472943,6433235.946381,1740788.283491,6511201.698335 
		Image Coordinates 227, 115 
		Map Coordinates 1663128.279584, 6476040.672944 
		Number of results 0 
		Scale -1.000000 
		Cellsize 0.000000 
		Is this an issue of projection? What does a scale of -1
mean? 

		This is the relevent openlayers javascript:
		map.events.register('click', map, function (e) { 
	
OpenLayers.Util.getElement('nodeList').innerHTML = "Loading... please
wait..."; 

		            var url =  wms.getFullRequestString({ 
		                            REQUEST: "GetFeatureInfo", 
		                            EXCEPTIONS:
"application/vnd.ogc.se_xml", 
		                            BBOX:
wms.map.getExtent().toBBOX(), 
		                            X: e.xy.x, 
		                            Y: e.xy.y, 
		                            INFO_FORMAT: 'text/html', 
		                            //QUERY_LAYERS:
wms.params.LAYERS, 
		                            QUERY_LAYERS: map.getName(),

		                            WIDTH: wms.map.size.w, 
		                            HEIGHT: wms.map.size.h}); 
		            OpenLayers.loadURL(url, '', this, setHTML); 
		            OpenLayers.Event.stop(e); 
		      }); 
		    function setHTML(response) { 
		        OpenLayers.Util.getElement('nodeList').innerHTML
= response.responseText; 
		    } 

		Thank you, 
		Alexandre Laplante 


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