If you're doing point queries MapServer/MapScript can do this for you. You do a mapObj.queryByPoint with the MS_SINGLE mode and then the function will identify the closest feature (considering TOLERANCEs!) in the top-most ACTIVE layer.
This site uses this to it's advantage... http://www.dnr.state.mn.us/maps/compass.html A query drops through the layers until a match is hit. Even with other geometry types based on what was described you can probably do it pretty easily. You'd use one of the other query methods and then once the query is done loop through your layer stack backwards (e.g. starting at the top) and stop when you find one with results. Steve >>> Paul james <[email protected]> 05/20/09 7:56 AM >>> Thanks Pano... But It́s not that simple... What I need is figure out what LAYER was clicked... Paul On Wed, May 20, 2009 at 6:43 AM, Pano Voudouris <[email protected]>wrote: > Probably don’t understand what exactly you are trying to achieve here but > it is not as simple as map.getLayer(0) to get the topmost layer? And once > you have the layer object use one of the query function to select the > record? E.g. myLayerObj.queryByPoint ? > > > > Pano > > > > *From:* [email protected] [mailto: > [email protected]] *On Behalf Of *Paul james > *Sent:* 19 May 2009 21:46 > *To:* [email protected] > *Subject:* [mapserver-users] Get the nearest layer with mapscript... > > > > Hello guys... > I have several layers (lines, points, poly) ... > Ím developing a measure tool... User can click on map and I have to > select that layer to calculate de Area with postgis... > > Ím trying to do that WITHOUT using "LAYER ACTIVE SYSTEM"... > > Is That possible using mapscript? How Can I find the nearest and toppest > layer ? > > Thanks! > > Paul > > _______________________________________________ > mapserver-users mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/mapserver-users > > _______________________________________________ mapserver-users mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/mapserver-users
