The pointzip.exe program can efficiently convert large 3D scans from the PTS or PTX format (produced by Leica's Cyclone and other point cloud software) into the compressed LAZ or the uncompressed LAS format. The corresponding pointUNzip.exe program can convert the compressed LAZ or the uncompressed LAS files back to the original PTS or PTX files.
When using the compressed LAZ format (which uses the LASzip compression algorithm) the reduction in file size is a factor of 5 to 15 depending on the coherency in the point order and the number of digits stored. The user has full control about the level of precision. The intensity range of -2048 to 2047 in the PTS format gets mapped to 0 4095 during compression to LAZ or LAS and back to -2048 to 2047 during decompression to PTS. Similarly, the intensity range of 0.0 to 1.0 in the PTX format gets mapped to 0 4095 in LAZ/LAS and back. This makes compression not only lossless but also produces valid and compatible LAZ or LAS files that can be imported into other software packages.