Howdy all
I've searched around the archive looking for this and come up empty, so apologies if this has come up before.
I'm using PHP/Mapscript in an application to select features in one Postgis layer that intersect a selected feature of another layer. The first layer is comprised of non-adjacent polygons and the second is country boundaries. I'm finding that the number of returned features tends to vary with scale, where at a "country display" scale I can see a few features just outside the country boundary that are selected. As I zoom in, these extra features drop off the list to the true desired set, and as I zoom out more "outside" features are included in the results. The result set is not related to map extent.
With some extraneous code removed (probably not the most elegant):
$cntry_layer->setFilter("gid = ".$fid);
$search_shp = $cntry_layer->getShape(-1,$fid);
$poly_layer->queryByShape($search_shp);
Are there scale-dependent considerations to getShape()? Any input on where in the process this may be happening?
Mapserver: 4.8.1
Postgres: 8.1.3
Postgis: 1.1.1
GEOS: 2.2.1
Linux x86_64 2.6.9-22
Thanks for any input
Cheers!
Chris Barber
