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

[Steve Lime]

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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