<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="">They’re mostly marked at 1 (unclassified) but I’ve seen a few that are 11 (road surface)!<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Mar 9, 2022, at 17:05, Kirk Waters - NOAA Federal <<a href="mailto:kirk.waters@noaa.gov" class="">kirk.waters@noaa.gov</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">Is there any chance the points are marked as withheld? I've seen quite a bit of data where bad points are marked as withheld but not marked as noise.<div class=""><br clear="all" class=""><div class=""><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr" class=""><div dir="ltr" class=""><div dir="ltr" class=""><div dir="ltr" class=""><div dir="ltr" class=""><div dir="ltr" class=""><div class=""><font face="arial, helvetica, sans-serif" class="">Kirk Waters, PhD </font></div><div class=""><font face="arial, helvetica, sans-serif" class="">NOAA Office for Coastal Management<br class=""></font></div><div class=""><font face="arial, helvetica, sans-serif" class="">Applied Sciences Program </font></div><div class="">Phone: 843-284-6962 (New as of 2022)<font face="arial, helvetica, sans-serif" class=""> </font><div class=""><font face="arial, helvetica, sans-serif" class=""><a href="http://coast.noaa.gov/digitalcoast" target="_blank" class="">coast.noaa.gov/digitalcoast</a></font><br class=""></div></div><div class=""><br class=""><br class=""></div></div></div></div></div></div></div></div></div><br class=""></div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Mar 9, 2022 at 4:45 PM Andreas Yankopolus <<a href="mailto:andreas@yank.to" class="">andreas@yank.to</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="overflow-wrap: break-word;" class="">All—<div class=""><br class=""></div><div class="">I’m using USGS 3DEP point-clouds to generate surface-height rasters around Longmont, CO. The point-cloud files have spurious returns over many of the lakes/reservoirs in the area that are tagged other than 7 or 18. They’re streaks about 0.3 m long located 200+ m above the lake. In most cases the streak has 3–8 points, but I’ve found one with 34 points.</div><div class=""><br class=""></div><div class="">The outlier filter with statistical or radius methods doesn’t remove these longer streaks. Any recommendations on removing dense groups of points well separated from the main mass?</div><div class=""><br class=""></div><div class="">I’m having success with:</div><div class=""><br class=""></div><blockquote style="margin:0px 0px 0px 40px;border:none;padding:0px" class=""><div class="">{</div></blockquote><blockquote style="margin:0px 0px 0px 40px;border:none;padding:0px" class=""><blockquote style="margin:0px 0px 0px 40px;border:none;padding:0px" class=""><div class="">"type": "filters.outlier",</div></blockquote><blockquote style="margin:0px 0px 0px 40px;border:none;padding:0px" class=""><div class="">"method": "radius",</div></blockquote><blockquote style="margin:0px 0px 0px 40px;border:none;padding:0px" class=""><div class="">"radius": 16.0,</div></blockquote><blockquote style="margin:0px 0px 0px 40px;border:none;padding:0px" class=""><div class="">"min_k": 64</div></blockquote></blockquote><blockquote style="margin:0px 0px 0px 40px;border:none;padding:0px" class=""><div class="">}</div></blockquote><div class=""><br class=""></div><div class="">This seems to do the trick of removing isolated groups while leaving the main body of points alone, but I’m thinking these some other dimension that could be calculated and added to points then used to remove outlier groups later.</div><div class=""><br class=""></div><div class="">Cheers,</div><div class=""><br class=""></div><div class="">Andreas</div></div>_______________________________________________<br class="">
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