[mapserver-users] SV: Projection and mapquery

[Morten Sickel]

Sorry, forgot to say 

mapserver version 5.2.2 from osgeo4w php 5.2.5 if that matters


Morten

________________________________________
Fra: mapserver-users-bounces at lists.osgeo.org [mapserver-users-bounces at lists.osgeo.org] på vegne av Morten Sickel [Morten.Sickel at nrpa.no]
Sendt: 28. januar 2010 19:37
Til: mapserver-users at lists.osgeo.org
Emne: [mapserver-users] Projection and mapquery

I presently have a set up in which I plot some measurements on some background maps. Things work fine, but I want to add the possibility to query the measurement data set by clicking on a measurement. The measurements have coordinates in lat lon and I only manage to query those data if I plot the entire map in the same projection. I have tried to reproject the query point using code like

$mapproj=$map->getProjection();
$layerproj=$map->getlayerbyname('mobil')->getProjection();
if($mapproj!=$layerproj){
        $mapproj=ms_newProjectionObj($mapproj);
        $layerproj=ms_newProjectionObj($layerproj);
        debug(array($geopoint->x,$geopoint->y));
        $geopoint->project($mapproj, $layerproj);
        // projects the point from the projection of the map to the projection of layer
        debug(array($geopoint->x,$geopoint->y));
}

 the debug function just dumps the data and it is clear that the point is correctly reprojected, but anyhow
$map->queryByPoint($geopoint, MS_MULTIPLE, 1);
never gives anything if the mobil-layer and the map are in different projections.

Are there any ways to overcome this? As I am mostly working on maps from 60 deg north and upwards, geographical projection is not the projection of choise and I would prefer not having to reproject the measurement data.

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