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Results tagged with laspy
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user 34826
A Python library for reading, modifying, and creating LIDAR files.
1
vote
0
answers
287
views
Update EVLR header info for very large LAS files using laspy
The issue is noted at the github page for laspy here: https://github.com/grantbrown/laspy/issues/51
This builds on an earlier post at: Update EVLR header info for .LAS file using laspy
My method shown … The issue seems to be the file byte offset integer value (where the EVLR content is to be placed) is too large for laspy (using version 1.2.5 with python version 2.7.12 64-bit) to convert to a C long value …
- 201
2
votes
1
answer
2k
views
Update EVLR header info for .LAS file using laspy
I'm trying to change the header info for a LAS file using the python 2.7 (64-bit) laspy module (version 1.2.5). … import numpy as np
import laspy
import shutil
import datetime
print('Update started: {:%Y-%m-%d %H:%M:%S}'.format(datetime.datetime.now()))
# Set input / output filenames
evlrContentFile = ". …
- 201
3
votes
Accepted
Update EVLR header info for .LAS file using laspy
The issue is noted at the github page for laspy here:
https://github.com/grantbrown/laspy/issues/51
I needed to adjust the "start_first_evlr" property to be the full length of the LAS file as shown below … The laspy code in base.py seems to want to reset the mmap buffer to the size of the first EVLR (disregarding the point data content when the new EVLR is added). …
- 201