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@dr-jts i have tried to use PackedCoordinateSequence . But I found that when i do something like intersection , the toCoordinateArray() of PackedCoordinateSequence will be called. Then double[] turns to Coordinate[] again and the memory use is largger than before because double[] and Coordinate[] both exists.
For large geometry, there is a lot of points, then a lot of Coodinate Object. It takes multiple memory than byte[] or double[].
I know use Coodinate make the code readable. But i think performance is more important in future, because the spatial data size increase very fast.
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