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When using org.locationtech.jts.simplify, there is a parameter called distanceTolerance. What are the units in for this parameter? For example, feet, meters, km, etc. I'm not sure if this is relavent, but I am using this with a geopackage from gadm.org. The documentation defines this as,

Sets the distance tolerance for the simplification.

and

The simplification uses a maximum-distance difference algorithm similar to the Douglas-Peucker algorithm.

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    All units are assumed to be CRS units.
    – geozelot
    Commented Feb 25, 2022 at 8:40

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JTS always works in the units of the dataset you are using.

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