Changes between Version 1 and Version 2 of Processing/LeicaProcedure

Apr 28, 2009, 3:24:10 PM (15 years ago)



  • Processing/LeicaProcedure

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    11== Processing LIDAR data from Leica ALS50  ==
     3This page describes the basic steps involved in processing the Raw Scan data from the Leica ALS50 II. More information can be found [wiki:Sensors/LeicaLIDAR/MashUp here]
     5=== Navigation Processing ===
     7The first stage is to post-process the GNSS data and blend it with the IMU data to get the best position and attitude of the laser scanner for the flight.  This uses the IPAS Pro and Grafnav software packages on windows.
     9 * [wiki:Processing/IPASPro IPAS Pro guide]
     10 * [wiki:Processing/GrafNavProcessing GrafNav guide]
     12=== Raw scan to point cloud ===
     14This stage of the processing takes the raw scanner files and georeferences them to create a point cloud of the data. This is usually in the binary LAS format but may be output as ASCII if you wish.  This uses the ALSPP software.
     16 * [wiki:Processing/ALSPP ALS Post Processor guide]
     18After running the ALSPP check the % of first returns column in the main window. This should be high (probably >95%). If not then it may be an indicator to problems with the data (such as a large % of cloud coverage)
     20=== Data QC and further processing ===
     22The final stages of the processing are to quality check the data and filter out noisy points. To do this we use the Terrasolid package within the Microstation CAD environment, and can be very time consuming.  See [wiki:Processing/TerrascanTips tips] on using Terrascan and also the QC section [wiki:Sensors/LeicaLIDAR/MashUp#QC here] for details on the process.