Changes between Version 25 and Version 26 of Help/LeicaLidarDems


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Timestamp:
Feb 27, 2012 5:28:12 PM (8 years ago)
Author:
mark1
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  • Help/LeicaLidarDems

    v25 v26  
    11= Creating a DEM from a LIDAR point cloud =
    22
    3 This page contains instructions for creating a simple 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
     3This page contains instructions for creating a simple DEM from the ASCII point clouds acquired from the Leica ALS50 II in 2009 onwards. Instructions are given for using your ARSF data in the GRASS GIS system.
     4
    85There is also a section giving instructions on how to make your DEM suitable for use in the azgcorr software.
    96
    10 '''This assumes that you have removed any noisy points that you do not wish to be used in the making of your DEM.'''
     7'''This assumes that you have removed any noisy points that you do not wish to be used in the making of your DEM (see [wiki:Processing/LidarNoisyPoints]).'''
    118----------
    12 == ArcGIS ==
    13 notes coming when we need to figure it out - please email us.
    14 ----------
    15 == ENVI ==
    16 know how to do this, but not written it up yet - please email us.
    17 -----------
    18 == ERDAS Imagine ==
    19 notes coming when we need to figure it out - please email us.
    20 ------------
    21 == GRASS ==
    22 The first step is to create a location of the required area. See the GRASS reference manual for help with this. When this is done the ASCII point data can be loaded in.  To import the ASCII data it must be within the GRASS region limits, any data outside the current region will not be imported. If you know the extent of your data you can set the region limits and skip the next step.
     9== Using GRASS ==
     10The first step is to create a location of the required area. See the GRASS reference manual for help with this. Alternatively you can download a template grass database from here: [raw-attachment:Help/DEM_scripts:grass_db_template.zip]
     11
     12When this is done the ASCII point data can be loaded in.  To import the ASCII data it must be within the GRASS region limits, any data outside the current region will not be imported. If you know the extent of your data you can set the region limits and skip the next step.
    2313
    2414Scan through the point cloud and find the min/max Eastings and Northings: