Trying to retrieve raster values from a layer. Never seems to get the correct data. Am I forgetting to do something? Colpixel and rowpixel also seem to be wildly off.
ILayer2Ptr ned = GetLayerView()->GetLayerByName(ned_layer);
ISpatialReferencePtr mapSpatialRefPtr;
GetMapView()->m_MapControlPtr->get_SpatialReference(&mapSpatialRefPtr);
ned->putref_SpatialReference(mapSpatialRefPtr);
IRasterLayerPtr rastLayerPtr(ned);
IRasterPtr rastPtr;
rastLayerPtr->get_Raster(&rastPtr);
IRaster2Ptr rast2Ptr = (IRaster2Ptr)rastPtr;
if(rast2Ptr == NULL)
return;
while(curLine.GetCurrentPoint() != NULL){
CPoint *Pnt = curLine.GetCurrentPoint();
long colpixel = 0;
long rowpixel = 0;
rast2Ptr->ToPixelColumn(Pnt->x, &colpixel);
rast2Ptr->ToPixelRow(Pnt->y, &rowpixel);
_variant_t ret;
rast2Ptr->GetPixelValue(0, colpixel, rowpixel, &ret);
double val = double(ret);
Pnt->z = val;
curLine.NextPoint();
}
