Changes between Version 31 and Version 32 of Processing/LidarCalibrationProcedure


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Timestamp:
Aug 29, 2012 3:31:30 PM (7 years ago)
Author:
knpa
Comment:

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  • Processing/LidarCalibrationProcedure

    v31 v32  
    6464 * There should now be some files with .bin extension- they are created automatically alongside the .pngs.
    6565
    66 4. Ground Classification [[BR]]
    67  To ground classify the *.bin files use lasground from LASTools. This tool has a 1.5million point limit so the *.bin files need to be split up first into smaller files. Note this process can be easily scripted.
     664. Ground classify the bin files. Run ground_classify_las_bin.sh in a directory containing only the .bin files created in the above step.
     67 The classified files will be created in a ground_classified/ subdirectory.[[BR]][[BR]]
     68 Manual way. To ground classify the *.bin files, we use lasground from LASTools. This tool has a 1.5million point limit so the *.bin files need to be split up first into smaller files.[[BR]]
    6869 * run las2las with the option -subseq:
    6970 e.g. las2las -i lasfile1.bin -subseq 0 1500000 -o lasfile1_a.bin; las2las -i lasfile1.bin -subseq 1500000 3000000 -o lasfile1_b.bin etc.
     
    7172 * run lasmerge -i lasfile1*gr.bin -o ground_classified/lasfile1.bin
    7273 * las2las -i ground_classified/lasfile1.bin -o ground_classified/lasfile1.LAS
    73  * replace the attune created *.bin files with the ground classified ones.
    74  
    75  Check the ground_classified LAS files in LAG to make sure that the classification has worked as expected. You can alter the settings used in lasground e.g. using -step, -spike. See the lasground Readme for more info.  [[BR]]
    76 
     74
     75 Check the ground_classified LAS files in LAG to make sure that the classification has worked as expected. If doing it manually, you can alter the settings used in lasground e.g. using -step, -spike. See the lasground Readme for more info. When satisfied, replace the attune created *.bin files with the ground classified ones.
    7776
    7877Note: Ground classification procedures using TerrsScan can be found [wiki:Sensors/LeicaLIDAR/MashUp#Groundclassification here].
    79 
    80 
    8178
    82795. Tie point the data [[BR]]