Hello,
The LASzip compression extension - that re-encodes the new LAS 1.4 point types as the legacy LAS 1.2 point types 1 and 3 or the LAS 1.3 point types 4 and 5 before applying standard LAZ - is ready for large scale testing prior to release. Do you have LAS 1.4 with the new point types? Please help us testing!!! Instructions are at the end of the email. You need version 141021 or newer of laszip, lasinfo, and lasdiff that are all part of the open source LAStools.
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As per our press-release for INTERGEO [1] here repeated the advantages of this approach (although ESRI's recent hostile moves on the "LAZ cloning front" seem to be diminishing benefit # 4):
1) existing legacy software can readily read the re-encoded LAS 1.4 files,
2) the popular LASzip compressor can trivially compress and decompress re-encoded LAS 1.4 content,
3) easier adaptation of the new LAS 1.4 point types by mitigating their impact on existing LAS 1.3 workflows, and
4) extra time gives geospatial players the opportunity to jointly develop the final *native* LAS 1.4 compressor and avoid fragmenting compressed LiDAR into incompatible formats.
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Here how to test on your own files containing the new LAS 1.4 point types:
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(1) make sure you have the latest version of LAStools
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>> laszip -version
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(2) make sure it is really a new point type
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>> lasinfo -i las14.las -nc
[...]
point data format: 7
point data record length: 40
[...]
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(3) compress with option '-compatible'
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>>laszip -i las14.las -compatible -o las14_compatible.laz
WARNING: the new 'compatibility mode' encoding for the new LAS 1.4
points is not complete. this is just an awesome prototype
as proof of concept as we gather community input ... (-;
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(4) de-compress with option '-compatible'
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>>laszip -i las14_compatible.laz -compatible -o las14_compatible.las
WARNING: the new 'compatibility mode' encoding for the new LAS 1.4
points is not complete. this is just an awesome prototype
as proof of concept as we gather community input ... (-;
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(5) check identity of contents
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>>lasdiff -i las14.las -i las14_compatible.las
checking 'las14.las' against 'las14_compatible.las'
headers are identical.
raw points are identical.
files are identical. both have 874463 points. took 0.808 secs.
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(6) check forward-compatible point type re-coding in LAZ file
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>> lasinfo -i las14_compatible.laz -nc
[...]
point data format: 3
point data record length: 43
[...]
Regards,
Martin @rapidlasso
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