| GeometryHash | [string](https://learn.microsoft.com/en-us/dotnet/api/System.String?view=netstandard-2.0) | Returns a signature of the input geometry, useful for diffing.<br>The hash is computed as a serialised array representing the coordinate of significant points taken on the geometry.<br>The number of points is reduced to the minimum essential to determine uniquely any geometry.<br>Additionally, the resulting points are transformed based on the source geometry type, to remove or minimise collisions.<br>(Any transformation so performed is translational only, in order to support geometrical tolerance, i.e. numerical distance, when comparing GeometryHashes downstream). | - | Geometry_Engine |
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