<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Mar 9, 2022, at 17:09, Bradley Chambers <<a href="mailto:brad.chambers@gmail.com" class="">brad.chambers@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div class="">You might have luck with <a href="https://pdal.io/stages/filters.reciprocity.html#filters-reciprocity" class="">https://pdal.io/stages/filters.reciprocity.html#filters-reciprocity</a> or <a href="https://pdal.io/stages/filters.miniball.html#filters-miniball" class="">https://pdal.io/stages/filters.miniball.html#filters-miniball</a>, though I think both may require a bit of trial and error to determine the correct neighborhood size to use.</div></div></div></blockquote><div><br class=""></div>These both look great. I’ll run example data through them and inspect the new dimension in QGIS or CC.</div><div><br class=""></div><div>The goal in all this is calculating a surface-height raster that will get combined with USGS terrain-height and NLCD category rasters for radio propagation calculations. Capturing building roofs is very important, but I can filter the side. I expect that tuning will be necessary based on the point density in the lidar collect.</div><div><div><br class=""></div><div><blockquote type="cite" class="">On Mar 9, 2022, at 17:16, Michael Smith <<a href="mailto:michael.smith.erdc@gmail.com" class="">michael.smith.erdc@gmail.com</a>> wrote:</blockquote><div class=""><blockquote type="cite" class=""><br class=""></blockquote><blockquote type="cite" class="">Filters.dem is also a useful filter to removing some of this high noise <a href="https://pdal.io/stages/filters.dem.html" class="">https://pdal.io/stages/filters.dem.html</a></blockquote></div></div><br class=""></div><div>I’ll always have a terrain raster for comparison, so this could work as well if I know the tallest building in advance.</div><div><br class=""></div><div>Thanks,</div><div><br class=""></div><div>Andreas</div></body></html>