LAZ files can be converted to LAS files using the LASzip tools developed by Martin Isenburg
and the Convert LAS tool.
To use the LASzip tools, the LASzip.exe file must be saved to the directory where the LAZ files are located.
Detailed instructions can be found on the GeoNB website.
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LAZ is a compressed light detection and ranging (lidar) data format that is often used to transfer large amounts of lidar data. ArcMap can process LAS files but not LAZ files. To open and use LAZ files in ArcMap, they must first be converted to LAS using the spatial ETL tool .
How To: Open LAZ files in ArcMap
The Esri Community provides a forum for users to discuss how to convert.LAZ files to.LAS in order to load them into ArcMap. The documentation suggests creating a scene layer package, but this tool has been deprecated. The Convert LAS tool can be used to convert the files into.LAS format.
Converting .LAZ files to .LAS - Esri Community
LAZ files are a compressed version of LiDAR data used to transfer it to other applications. To convert LAZ files to LAS files, users must download the LASzip tools developed by Martin Isenburg and save the LASzip.exe file to the directory where the LAZ files are located. More detailed instructions are provided by GeoNB and can be found on the GeoNB website.
Converting LAZ to LAS files – Behind the Map