[gdal-dev] Problems with OGRGeometry Intersects

[Gabriel Fusca]

Hi,

I'm using Gdal 1.9.

I have a function that has to perform a intersection of a geometry based on
the click that is made on the screen.

The raster file (Geotiff) that has a projected reference system (WGS 84 /
UTM zone 21S)  and the geometry a georeferenced system (EPSG - 4326 WGS84).

The click that comes from the screen (spatial reference of the image)
create a geometry from calling point.Buffer (radius).

When i want to verify that the geometries intersect the intersects method
from OGRGeometry fails, even if the querypoint is transformed into the
spatial reference system of the geometry.

Envelopes from the 2 geometries.
QueryPoint
env.
if i generates the querypoint from the spatial reference of the geometry
that i want to intersect)
minx -61.66, maxx -53.66;
miny -41.97, maxy -33.97
else
minx 443322.50, maxx 443330.50
miny 5798153.59, maxy 5798161.59

Geometry env.
minx -57.79, maxx -57.59;
miny -38.08, maxy-37.92


The code is something like this:

// spatialfilterwindow image subset transformed into
// the spatial reference of the vector to intersect
Extent spatialfilter(spatialfilterwindow);
player->SetSpatialFilterRect(spatialfilter.min_.x_,
                            spatialfilter.min_.y_,
                            spatialfilter.max_.x_,
                            spatialfilter.max_.y_);
OGRLayer* player = ...;
OGRFeature *pfeature = player->GetNextFeature();
OGRPoint querypoint = OGRPoint(Point.x_, Point.y_);
querypoint.assignSpatialReference(new OGRSpatialReference(SrWkt.c_str()));
OGRGeometry* pquerypoly = querypoint.Buffer(radius);
 *while *(pfeature) {
    OGRGeometry *pgeometry = pfeature->GetGeometryRef();
    *if *((pgeometry && pgeometry->Intersects(pquerypoly) == TRUE)
        || (pquerypoly && pquerypoly->Intersects(pgeometry) == TRUE)) {
        // do something...
    } *else *{
        // handle the intersection fail
    }
    pfeature = player->GetNextFeature();
}

Any idea why it fails?

Thanks,
Regards,

-- 
Gabriel Fusca
SUR Emprendimientos Tecnológicos

Perú 345  Piso 5to Oficina "B" (C1067AAG)
Ciudad de Buenos Aires, Argentina
Tel. +54 (11) 4342-2976/84
gabrielfusca at suremptec.com.ar
http://www.suremptec.com/
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