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Running the contour generator on a USGS LAS dataset, I filter for ground points, then generate contours. Once this is done along the edge of the las file the contours draw to each other, like there is a straight vertical wall along the edge. Please see red circle attached. Also does not matter if I change my tolerance on the contour generator. Tried at 1 and 100. Same result

My transformers

las--> point cloud filter-->contour generator--> line combiner 

This is a result of there not being any data outside of your source point cloud. Best way to avoid this is to feed in data for a larger area than you'll actually need (if you have that data available) and then clip the contours afterwards.

Yes, that works, but not always available. This does not happen in Civil3d, when I run a surface model. Seems like there should be a boundary or something in fme to aid this problem.

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