| | 1 | = Creating a DEM from a LIDAR point cloud = |
| | 2 | |
| | 3 | 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: |
| | 4 | * ArcGIS |
| | 5 | * ENVI |
| | 6 | * ERDAS Imagine |
| | 7 | * GRASS |
| | 8 | There is also a section giving instructions on how to make your DEM suitable for use in the azgcorr software. |
| | 9 | ---------- |
| | 10 | == ArcGIS == |
| | 11 | |
| | 12 | ---------- |
| | 13 | == ENVI == |
| | 14 | |
| | 15 | ----------- |
| | 16 | == ERDAS Imagine == |
| | 17 | |
| | 18 | ------------ |
| | 19 | == GRASS == |
| | 20 | |
| | 21 | ------------ |
| | 22 | == Making the DEM suitable for azgcorr == |
| | 23 | To make a suitable ASCII DEM for us 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): |
| | 24 | |
| | 25 | `or c r xm ym xx yx gi` |
| | 26 | |
| | 27 | where: |
| | 28 | |
| | 29 | or = row order of the data [0 if South to North, 1 if North to South] |
| | 30 | |
| | 31 | c = number of columns |
| | 32 | |
| | 33 | r = number of rows |
| | 34 | |
| | 35 | xm = minimum easting |
| | 36 | |
| | 37 | ym = minimum northing |
| | 38 | |
| | 39 | xx = maximum easting |
| | 40 | |
| | 41 | yx = maximum northing |
| | 42 | |
| | 43 | gi = grid size (spacing) |
| | 44 | |
| | 45 | An example header might be: 1 2000 2000 400000 850000 410000 860000 5 |
| | 46 | |