The Thin Las tool gives me an out of memory error regardless of the settings. I'm on a windows 10 machine with 96GB of physical ram running ArcPro 2.7.1. The files are LAS 1.4 (format 6) and I have tiled them so that the largest laz file is only 75 kb. Even so, Thin LAS tool gives me an out of memory error within a minute despite never using much physical memory.
The Thin LAS tool is the only tool I have issues with and I get the same out of memory error doing 64-bit background geoprocessing in ArcMap (10.6.1). It doesn't seem to be an actual out of memory issue though because I can get the tool to run by switching to 32-bit foreground processing in ArcMap.
I am having this same issue when I choose Closest to Average Height for the Point Selection Method. I am also using 3D Thinning Dimension. After clicking run, the 000426: Out Of Memory.—ArcGIS Pro | Documentation error presented immediately.
Running ArcGIS Pro 2.6.1 and working with Pix4D photogrammetry-derived LAS files version 1.2.