Support for vectorizing very large rasters
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Key: GEOT-3121
URL: http://jira.codehaus.org/browse/GEOT-3121
Project: GeoTools
Issue Type: Improvement
Reporter: Michael Bedward
Assignee: Michael Bedward
Priority: Minor
RasterToVectorProcess accumulates line segments in memory as it processes the
input grid coverage and then passes them to JTS Polygonizer en masse. When
vectorizing all boundaries in a very large coverage the line segments can
exhaust available memory before the process is completed.
The following is one idea for addressing this:
# Modify RasterToVectorProcess to return a DataStore instead of a
FeatureCollection.
# Allow the user to provide a DataStore to use as the destination and a name to
assign to the destination SimpleFeatureType. If not provided a new DataStore
will be created and a default name used.
# Process the input raster in sections based on tiles or some number of rows
(rows might be safest).
# The line segments generated in each section are polygonized to create new
SimpleFeatures which are added to the destination DataStore.
# In the case of raster regions extending beyond the boundaries of an input
section, temporary edges are added so that valid polygons can be created. The
location of these edges is recorded so that the resulting features can be
merged as a final step in the process.
I don't know if the above is the best approach. Comments welcome !
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