Hi all,
I caught a typo in my code snippet that I just sent regarding the spatial
query. It should have read where location replaces newGeometry:
Geometry geom = (Geometry)
feature.getAttribute(schema.getGeometryDescriptor().getLocalName());
if (location.intersects(geom)) {
fCollection.add(feature);
}
}
I was cutting and pasting and put the wrong snippet in the email, so this
typo did not cause the problem i'm experiencing.
Sorry about the possible confusion,
Wade
> Hi all,
>
> Im attempting to run a program that dynamically adds and modifies
> features in a shapefile, where I decide on which features get modified
> through a spatial index query with a Quadtree.
>
> When testing the code, if I:
>
> (1) create a new feature,
>
> fStore.addFeatures(DataUtilities.collection( newFeature ));
> spatialIndex.insert( bounds, newFeature );
>
> (2) query that features location (spatialIndex.query(
)) to get the
> feature, and then
>
> (3) try to remove that feature in the same instance (through
> featureStore.removeFeatures()),
>
> It creates the feature fine, but doesnt remove it. However, if I run two
> separate instances of my class where I create the feature in the first,
> and then remove it in the second, it works fine. E.g.,
>
> MyFeatureClass mfc = new MyFeatureClass ();
> mfc.createFeature();
> MyFeatureClass mfc2 = new MyFeatureClass ();
> mfc2.modifyFeature();
>
>
> Checking into this further, I noticed that this only happens in my code
> when I use the Quadtree spatial index to query my features. E.g., if I
> query my spatial index based on the coordinate of where I created my new
> feature,
>
> Point location = geofactory.createPoint(coord);
> List<SimpleFeature> hits =
> spatialIndex.query(location.getEnvelopeInternal());
> SimpleFeature feature;
> for (int i = 0; i < hits.size(); i++) {
> feature= hits.get(i);
> Geometry geom = (Geometry)
> feature.getAttribute(schema.getGeometryDescriptor().getLocalName());
> if (newGeometry.intersects(geom)) {
> fCollection.add(feature);
> }
> }
>
> Set<FeatureId> removeFeatureSet = new HashSet<FeatureId>();
> FilterFactory2 ff = CommonFactoryFinder.getFilterFactory2( null );
>
> iterator = fCollection.features();
> while( iterator.hasNext()){
> SimpleFeature feature = iterator.next();
> removeFeatureSet.add( ff.featureId(feature.getID()));
> spatialIndex.remove( bounds, feature );
> }
> removeFilter = ff.id( removeFeatureSet);
> fStore.removeFeatures(removeFilter);
>
>
>
> Alternatively, if I query my to-remove features straight from the feature
> source instead of getting them from the spatial index, it works fine.
> E.g.,
>
> Filter filter= ff.intersects(ff.property(geometryPropertyName),
> ff.literal(newGeometry));
> fCollection = fSource.getFeatures( filter );
>
(as above)
removeFeatures(removeFilter);
>
> I would like to use a Spatial Index for querying because Ill be doing a
> lot of location-based queries for features on a large dataset, but I also
> need to modify the shapefile frequently. Can the JTS Quadtree be used to
> query and return features that will then get modified in the same
> instance? Or do I need to get features straight from the feature source
> insead of the spatial index when modifying? If anyone has any suggestions
> I would greatly appreciate it. I can send the full code if anyone would
> like to see.
>
> Thanks,
> Wade
>
>
>
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