Changes between Version 31 and Version 32 of Processing/LidarCalibrationProcedure
- Timestamp:
- Aug 29, 2012, 3:31:30 PM (12 years ago)
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Processing/LidarCalibrationProcedure
v31 v32 64 64 * There should now be some files with .bin extension- they are created automatically alongside the .pngs. 65 65 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. 66 4. 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]] 68 69 * run las2las with the option -subseq: 69 70 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. … … 71 72 * run lasmerge -i lasfile1*gr.bin -o ground_classified/lasfile1.bin 72 73 * 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. 77 76 78 77 Note: Ground classification procedures using TerrsScan can be found [wiki:Sensors/LeicaLIDAR/MashUp#Groundclassification here]. 79 80 81 78 82 79 5. Tie point the data [[BR]]