= Creating a DEM from a LIDAR point cloud = This page contains instructions for creating a DEM from the ASCII point clouds acquired from the Leica ALS50 II in 2009 onwards. Instructions are given for using your ARSF data in four GIS systems: * ArcGIS * ENVI * ERDAS Imagine * GRASS There is also a section giving instructions on how to make your DEM suitable for use in the azgcorr software. This assumes that you have removed any noisy points that you do not wish to be used in the making of your DEM. ---------- == ArcGIS == ---------- == ENVI == ----------- == ERDAS Imagine == ------------ == GRASS == ------------ == Making the DEM suitable for azgcorr == To make a suitable ASCII DEM for use in the azgcorr software, the header information of the ASCII DEM file must be in a certain format. The required format is to have a header of one line (the first line of the file) with the DEM data following. The format is (as given by the azgcorr help): `or c r xm ym xx yx gi` where: or = row order of the data [0 if South to North, 1 if North to South] c = number of columns r = number of rows xm = minimum easting ym = minimum northing xx = maximum easting yx = maximum northing gi = grid size (spacing) An example header, for a DEM of 2000 rows x 2000 columns at 5m resolution, might be: 1 2000 2000 400000 850000 410000 860000 5