[mapserver-users] MapScript querybypoint using mapObj rather than layerObj

[Joe Nunn]

Hi 

 

I am using MapScript to perform a querybypoint and I have succeeded in
querying each individual layer however this is slow and I wonder if this is
possible (as the documentation suggests) by querying the mapObj and come
back results from all layers within the mapfile.

 

My current code is:

 

$o_map = ms_newMapObj("QueryCounties.map");

$v_nl = $o_map->numlayers;

$o_point = ms_newPointObj();

$o_point->setXY($v_longitude, $v_latitude);

 

//loop through layers in mapfile

for($j = 0; $j < $v_nl; $j++) {

                $o_query_layer = $o_map->getLayer($j);

                $o_query_layer->set("status",1);

 

                //select layer if point lies within layer

                if ((@$o_query_layer->queryByPoint($o_point, MS_MULTIPLE,
-1))==MS_SUCCESS) {

                                $o_query_layer->open();

                                

//gets the first result from each query

                                $o_result = $o_query_layer->getResult(0);

                                $o_shape =
$o_query_layer->getShape(-1,$o_result->shapeindex);

 

                                //return values from columns of shapefile

                                $v_decade = $o_shape->values["NAME"];

 

 

 

And my attempt to perform queryByPoint on a mapObj is like this:

 

$o_query = $o_map->queryByPoint($o_point, MS_MULTIPLE, -1);

echo "query_results:   ".$o_query;

 

My Mapfile looks like this:

 

                           MAP

  NAME "Counties"

  SHAPEPATH "C:\Data\

  STATUS ON

  PROJECTION

    "init=epsg:4326"

  END

 

  LAYER

    NAME Counties1790

    STATUS ON

    DATA "US_county_1790_region.shp"

    TYPE POLYGON

    CLASS

       NAME "counties"

       TEMPLATE "void"

    END 

  END 

  

  LAYER

    NAME Counties1810

    STATUS ON

    DATA "US_county_1810_region.shp"

    TYPE POLYGON

    CLASS

      NAME "counties"

      TEMPLATE "void"

    END

END

.....

          END

Anyone know how to get this querybypoint working on a mapobj and if it will
speed up the code?

 

All the best

 

Joe 

 

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