LAS unreadable with QGIS after exported it without changes with writeLAS

[Redcozmo]

Hi,

I encountered an issue with reading a LAS file exported with lidR in QGIS, without any change... Issue or understanding problem from me ? LidR or QGis ?

1 - I read the LAS file 2 - I export with writeLAS function 3 - I try to read it with QGIS and I have this error :

Invalid Data Source : /data/LHD_FXX_0843_6530_PTS_O_LAMB93_IGN69_nochange.copc.laz is 
not a valid or recognized data source, error: "Unable to recognize /data/LHD_FXX_0843_6530_PTS_O_LAMB93_IGN69_nochange.copc.laz as a LAZ file: """

I can read the original LAS file with QGIS. I can read the exported LAS with lidR.

You can download the LAS here : https://storage.sbg.cloud.ovh.net/v1/AUTH_63234f509d6048bca3c9fd7928720ca1/ppk-lidar/OL/LHD_FXX_0843_6530_PTS_O_LAMB93_IGN69.copc.laz

Code :

# Set working directory
setwd(dirname(rstudioapi::getActiveDocumentContext()$path))

# Libraries
library(lidR) # to manipulate LiDAR data

# Read LAS
input_filename <- "LHD_FXX_0843_6530_PTS_O_LAMB93_IGN69.copc.laz"
output_filename <- "LHD_FXX_0843_6530_PTS_O_LAMB93_IGN69_nochange.copc.laz"
input_filepath <- paste(getwd(), input_filename, sep = "/")
output_filepath <- paste(getwd(), output_filename, sep = "/")
las <- readLAS(input_filepath)

# Write LAS
lidR::writeLAS(las = las, file = output_filepath)

Thanks a lot !!

[Jean-Romain]

My best guess: lidR does not write copc files. It seems that QGIS is parsing the .copc.laz extension without checking if the file is really a copc file or not. Your file is not a copc file. Try to name it .laz

[Redcozmo]

Yes it's that !! Thank you very much.

[Jean-Romain]

lasR can write COPC files. Also my development version (still on my computer) of rlas can do it so my version of lidR can do it. I could upload it if you want to test.

[Redcozmo]

I keep in mind lasR package that I didn't know but for the moment lidR is already a good and sufficient learning for me. Thanks !