[mapserver-users] Fwd: queryByPoint - Street Layer ?

[Hussain Hashmi]

On Wed, Jul 8, 2009 at 8:56 PM, Steve Lime <Steve.Lime at dnr.state.mn.us>wrote:

> May well be a tolerance issue. By default it's in pixels and based on the
> extent you're setting (I don't
> know what the map SIZE is set to) it's probably a super tiny value. Have
> you tried setting a tolerance
> in map units? E.g.
>
>  TOLERANCE 5
>  TOLERANCEUNITS meters # or whatever
>
> Just an idea...
>
> Steve
>
> >>> On 7/8/2009 at 12:20 PM, in message
> <28aabd160907081020g1a1482f4mabdfe3c24d7472cc at mail.gmail.com>, Hussain
> Hashmi
>  <tohashmi at gmail.com> wrote:
> > hi
> >
> > Can someone here guide me on this issue please.
> > My Objective is to get attribute values for any selected street (Line).
> > My client application is based on KaMap.
> > I have a similar solution for Polygons which works perfectly.
> >
> >
> > I am trying to query a street layer which gives me the following error.
> >
> > Warning: [MapServer Error]: msQueryByPoint(): No matching record(s) found
> in
> > C:\... on line 84
> > Warning: [MapServer Error]: msShapefileOpen():
> > (/ms4w/maps/./city/./city/streets) in c:\... on line 84
> >
> >
> > MAPFILE
> > **********************
> >   LAYER
> >     NAME 'streets_Query'
> >     GROUP 'streets_Query'
> >     DATA './city/streets'
> >     TYPE line
> >     MAXSCALE 3001
> >     STATUS ON
> >
> >     TOLERANCE 5
> >     TEMPLATE './_templates/Streets_Identify.html'
> >     METADATA
> >       "queryable" "true"
> >        searchfield "ANAME"
> >        fields "ZIP_CODE"
> >     END
> >   END #end layer
> >
> >
> >
> > PHP MAPSCRIPT
> > **********************
> > //------- Get Input Parameters.
> > if (isset($_REQUEST['map']))    {$szMap = $_REQUEST['map'];} else {echo
> "map
> > not defined"; die;}
> > if (isset($_REQUEST['coords'])) {$coords =
> > explode(',',$_REQUEST['coords']);} else {echo "coordinate not defined";
> > die;}
> >
> >
> > //------- Load Mapscript Module.
> > $szPHPMapScriptModule = 'php_mapscript.'.PHP_SHLIB_SUFFIX;
> > if (!extension_loaded('MapScript')) {
> >  dl($szPHPMapScriptModule);
> > }
> >
> > //------- Load Current Map file.
> > $szMapFile=str_replace('<<Map>>',$szMap,'/ms4w/maps/<<Map>>.map');
> > $oMap = ms_newMapObj($szMapFile);
> >
> >
> > //------- SETTING MAP EXTENT to query extent..
> > $mapExtent = $oMap->extent;
> > $oMap->setExtent($coords[0],$coords[1],
> > $coords[0]+0.000001,$coords[1]+0.000001);
> >
> > //------- SETTING QUERY POINT
> > $point = ms_newPointObj();
> > $point->setXY($coords[0], $coords[1]);
> >
> > //------- Initialize map query.
> > $oMap->preparequery();
> >
> > //------- LOOP ON LAYERS and get identify results.
> > $tot = $oMap->numlayers;
> > for ($i = 0; $i < $tot; $i++) {
> >    //------- get map layer.
> >    $oLayer = $oMap->getLayer($i);
> >
> >    //------- Verify Layer type
> >    if ($oLayer->name != 'streets_Query') continue;
> >
> >    //------- Validate if query succeeds.
> >    $check_query = $oLayer->queryByPoint($point, MS_SINGLE, 0);
> >    if ($check_query != MS_SUCCESS) {continue;}
> >
> >    //------- Open layer for data input.
> >     $oLayer->open();
> >
> >    //------- Get the record values corresponding to a result tileindex.
> >    $oResultCache = $oLayer->getResult(0);
> >    $oShape = $oLayer->getShape($oResultCache->tileindex,
> > $oResultCache->shapeindex);
> >    $aValues = $oShape->values;
> >
> >    //------- Get the field value.
> >    echo $aValues['ZIP_CODE'];  echo ";";
> >
> >    //------- FREE SHAPE
> >    $oShape->free();
> >    $oLayer->close();
> >    break;
> > } // for i
> >
> >
> > Best regards,
> > Mir Hashmi
> >
> >
> >
> > ------------------------------
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> > cooperation.
>
>
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