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General / Artifacts in DEMs derived from scanned air photos

« on: November 18, 2020, 03:58:29 AM »

I have been using metashape to build DEMs from scanned airphotos for several years. I follow the USGS procedures for editing and optimizing the sparse point cloud and georeference using control points. Usually I get good (albeit noisy) results, but sometimes get a characteristic patchy artifact where there are zones that step up or down in elevation abruptly.  Any advice on the cause of this? I have attached a sample.