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I need a polygon or closed polyline of the extents of this data; using max and min (x,y) gives a bounding box which means further down my pipeline, data is being written to areas that should take "No Data". How can I grab extents from the point cloud to use it as a breakline?

 

Pictured; point cloud, and point cloud overlaid raster output, showing data written outside the point cloud extents

I think when i've done this in the past I've coerced the pointcloud to a single multipoint with a PointCloudCoercer and then used a hull accumulator

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