Topographic Point Cloud Analysis Toolkit (ToPCAT) is a software package developed by Brasington et al. (2012) used to decimate (or thin) a point cloud and calculate meaningful statistics for grid defined areas. The process of decimation can reduce computation time and produce meaningful summary outputs (e.g. zMin for modeling bare earth elevations; and detrended standard deviation for modelling surface roughness).
TLS, SFM, point cloud statistics, point cloud decimation,
A command line version of ToPCAT is available at: http://code.google.com/p/point-cloud-tools/; this version is built in with a UI as menus in the GCD. A stand alone version will be released later in 2014 early 2015.
Brasington, J., D. Vericat, and I. Rychkov. 2012. Modeling river bed morphology, roughness, and surface sedimentology using high resolution terrestrial laser scanning. Water Resources Research 48. DOI: 10.1029/2012wr012223.