[Chameleon] WMS queryByPoint

[Paul Spencer]

That would require a new query widget or query results page to implement 
your specific type of query.  The current query widget queries every 
visible layer at the point that you clicked within a certain tolerance.

It is reasonably easy to do what you need, but you will need to know 
some php_mapscript commands ...

Paul

Senaratne,Udesh [Ontario] wrote:
> Hi list,
> 
> Thanks for you reply Paul.
> 
> The idea was, if we have "layer A" consisting of Polygons, and "layer B"
> consisting of Points, and the user clicks on Geo-coordinate (x,y) then
> the Query returns:
> 1. The polygon feature in layer A that contains the geo-coordinate (x,y)
> 2. Return all the Points in Layer B be whose Geo-coordinate is contained
> in the Polygon obtained from 1.
> 
> An example would be, if I clicked somewhere on a Province (suppose
> polygon layer), I obtain all the cities (a point layer) belonging to
> that province.
> 
> Udesh
> 
> 
> -----Original Message-----
> From: Paul Spencer [mailto:pspencer at dmsolutions.ca] 
> Sent: Monday, December 20, 2004 3:01 PM
> To: Senaratne,Udesh [Ontario]
> Subject: Re: [Chameleon] WMS queryByPoint
> 
> 
> Udesh,
> 
> unfortunately WMS doesn't work like that, you don't have any access to 
> the actual underlying data.
> 
> Cheers,
> 
> Paul
> 
> Senaratne,Udesh [Ontario] wrote:
> 
>>Hello,
>>
>>In class,/ MapQuery::executePointQuery($nX, $n)/ [file ...
>>chameleon/htdocs/common/wrapper/map_query.php]/,/ the mapscript member
> 
> 
>>fucntion/ getWMSFeatureInfoURL(...)/ is used to obtain results when
> 
> the 
> 
>>layer connection type is MS_WMS. 
>>
>>Does anyone know if it is possible to use the php-mapscript function/
>>layerObj::queryByPoint(pointObj, multiple ,buffer)/ to do the same
> 
> thing 
> 
>>for WMS connections.  Chameleon uses this method for none WMS 
>>connections.  When I tried doing this for WMS connections, I got 0 
>>results for all layers when there should have been more.
>>
>>What I want to do eventually, is to access the shapeObj of the results
>>so that I can use the php-script function : 
>>s/hapeObj::contains(pointObj)/ .
>>
>>Thanks
>>Udesh
>>
>>
>>----------------------------------------------------------------------
>>--
>>
>>_______________________________________________
>>Chameleon mailing list
>>Chameleon at lists.maptools.org 
>>http://lists.maptools.org/mailman/listinfo/chameleon
> 
> 

-- 
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|Paul Spencer                           pspencer at dmsolutions.ca   |
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|Applications & Software Development                              |
|DM Solutions Group Inc                 http://www.dmsolutions.ca/|
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