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I've found that MCC-LIDAR does a very good job at classifying ground returns but it's very slow and doesn't support compressed LAS/LAZ. To that end, I've written a GUI version of the excellent PDAL automated ground classification tool. It supports compressed LAS/LAZ files and is significantly faster than MCC-LIDAR. You can download the PDAL automated ground classification tool here: PDAL Automated Ground Classification There's also a version for MacOS/OSX. If any Mac users would like a copy, please contact me via my web page here: Contact