Open laz file in read and write mode failed

[arthur-leguennec]

Hello everyone,

I'm trying to open a laz file to read and write on the classification. But when I run this command:
inFile = File("test.laz", mode = "rw")
I have the following message:

File "D:\Program Files (x86)\Python36-64\lib\site-packages\laspy\file.py", line 64, in __init__
self.open()
File "D:\Program Files (x86)\Python36-64\lib\site-packages\laspy\file.py", line 94, in open
self._writer = base.Writer(self.filename,mode = self._mode)
File "D:\Program Files (x86)\Python36-64\lib\site-packages\laspy\base.py", line 268, in __init__
self.setup_read_write(vlrs, evlrs, read_only=False)
File "D:\Program Files (x86)\Python36-64\lib\site-packages\laspy\base.py", line 293, in setup_read_write
self.data_provider.map()
File "D:\Program Files (x86)\Python36-64\lib\site-packages\laspy\base.py", line 209, in map
raise laspy.util.LaspyException("Error mapping file: " + str(e))
laspy.util.LaspyException: Error mapping file: 'bool' object has no attribute 'fileno'

If someone knows why I have this, I'll happy to know the answer!
I work on windows 10 64 bits, Python 3.6.2 and laspy 1.5.0

Thanks,
Arthur

[arthur-leguennec]

Just a precision (i remarked this just now ...), it works with a las file

[grantbrown]

Hmm, does it work on the las file which is equivalent to the laz file you're working with? That is, if you extract the laz file using lazip, does laspy read the result correctly?

[arthur-leguennec]

Yes, it's works with the same point cloud if it's a las but not a laz. And it's doesn't change if I extract a las file with laszip

[grantbrown]

Can you replicate the error with version 1.5.1 from GitHub? (I just incremented the version because we got behind on that. There are some changes which haven't been deployed to the package index).

[zwnk]

i get the same when opening a laz file in rw mode.
laspy 1.5.1 is installed.

[grantbrown]

Laspy doesn't support rw for laz files, but should probably give a better error. Laz files are currently read-only.

[zwnk]

good to know :)

[Sajjadmanal]

@grantbrown @arthur-leguennec How can I read .laz file using laspy? I am getting below error:
LaspyException: Error mapping file: Laszip was not found on the system

[niranjanreddy891]

Error says Laszip is missing. Install laszip and try again

[Sajjadmanal]

@niranjanreddy891 I installed laszip using :
conda install -c conda-forge laszip

I checked it is installed successfully using: conda list
Ran again but I gives me the same error.

[DineshChandra94]

@Sajjadmanal
After installing laszip download laszip-cli.exe from here and add its path to the environment. This should solve your issue.
If the above link doesn't work than you can go to https://laszip.org and then brows down to Binaries; here you should see laszip-cli.exe, download it and add its path to the environment.

[tmontaigu]

Closing as laspy 2.0 support writting LAZ files (However this is not done by opening in rw mode since laspy.File does not exists anymore)