[pdal-commits] [PDAL/PDAL] 5b1f7a: Improvements to filters.litree (#3520)

[chambbj]

  Branch: refs/heads/master
  Home:   https://github.com/PDAL/PDAL
  Commit: 5b1f7a5c22c4fd0fa5aceabf58f227fbb1294db0
      https://github.com/PDAL/PDAL/commit/5b1f7a5c22c4fd0fa5aceabf58f227fbb1294db0
  Author: chambbj <brad.chambers at gmail.com>
  Date:   2021-09-07 (Tue, 07 Sep 2021)

  Changed paths:
    M doc/stages/filters.litree.rst
    M filters/LiTreeFilter.cpp
    M filters/LiTreeFilter.hpp

  Log Message:
  -----------
  Improvements to filters.litree (#3520)

* Improvements to filters.litree

- roughly 8x speedup by eliminating repetitive KDtree builds and
  automatically assigning points to Ni if they are a set distance away
  (laterally) from the apex of the current tree Pi

- update docs -- descending sort of HeightAboveGround required

* Resolving PR comments

* guard std::max

Co-authored-by: Howard Butler <howard at hobu.co>