speedup building of geometries from osm entities #111
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relations with many (small) inner rings used to take a long time to assemble, because each of the "within" operation in a loop. by using a prepared geometry, this is substantially faster
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applies the idea from #66 to the cellIterator functions: some objects might have large OSH bboxes, but small geometries. Then it is not always necessary to calculate actual intersections (which are potentially slow).
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rtroilo
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Mar 8, 2019
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can confirm speed improvement of 3x faster on ignite (tested locally) |
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includes two improvements for building geometries:
Relations with many (small) inner rings used to take a long time to assemble, because each of the expensive
withinoperation in a loop. By using a prepared geometry, this is substantially faster. Eespecially for particularly complex example like relation/571669 this makes a large difference: processing times went down from several minutes to a few seconds.This applies the idea from improved splitting of "large" snapshot and contribution objects #66 to the cellIterator functions: Some objects might have a large OSH bbox, but small (snapshot or contribution) geometries. Then it is not always necessary to calculate actual intersections, which are potentially slow computations.