Hi @geojan, thanks for your question.
I do notice the same behaviour as you for datasets output by FME, when inspecting with PDAL. Do you have other source point cloud datasets for v1.4, not created in FME, in which PDAL can read the metadata? Would you be able to share some samples here for further investigation? From the LAS documentation it appears that the SRS storage format may have changed between versions. It may in fact be a limitation in PDAL that some of this info is not read. By comparison, using
LASTools, I have been able to read all coordinate system information output by FME, even when PDAL fails to.
Thanks,
Nathan
Hi @geojan, thanks for your question.
I do notice the same behaviour as you for datasets output by FME, when inspecting with PDAL. Do you have other source point cloud datasets for v1.4, not created in FME, in which PDAL can read the metadata? Would you be able to share some samples here for further investigation? From the LAS documentation it appears that the SRS storage format may have changed between versions. It may in fact be a limitation in PDAL that some of this info is not read. By comparison, using
LASTools, I have been able to read all coordinate system information output by FME, even when PDAL fails to.
Thanks,
Nathan
Hi, @NathanAtSafe, Yes, we do (e.g. ftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/Elevation/LPC/Projects/USGS_LPC_SD_MORiver_Woolpert_B1_2016_LAS_2018/laz/USGS_LPC_SD_MORiver_Woolpert_B1_2016_14TNP120300_LAS_2018.laz) and we can read out the coordinate system data of it with PDAL (see attachment). So, the strange behaviour of generating the LAZ v1.4 file in FME without SRS is not explained yet.
pdal-las-v14-with-srs.png
Hi, @NathanAtSafe, Yes, we do (e.g. ftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/Elevation/LPC/Projects/USGS_LPC_SD_MORiver_Woolpert_B1_2016_LAS_2018/laz/USGS_LPC_SD_MORiver_Woolpert_B1_2016_14TNP120300_LAS_2018.laz) and we can read out the coordinate system data of it with PDAL (see attachment). So, the strange behaviour of generating the LAZ v1.4 file in FME without SRS is not explained yet.
pdal-las-v14-with-srs.png
Hi @geojan
Thanks for the data. I ran your v1.4 LAZ through FME and wrote it back out to v1.4 LAZ. From this FME output I can read the SRS in PDAL. Are you getting different results? I am beginning to wonder if the behaviour you're seeing occurs only when converting an older version to v1.4.
Best,
Nathan
Hi @geojan
Thanks for the data. I ran your v1.4 LAZ through FME and wrote it back out to v1.4 LAZ. From this FME output I can read the SRS in PDAL. Are you getting different results? I am beginning to wonder if the behaviour you're seeing occurs only when converting an older version to v1.4.
Best,
Nathan
Hi @NathanAtSafe
Thanks for your response. This indeed seems to be the case. Is this then something you can resolve in the LAZ (v1.4) writer or is this not possible due to the LAS schema?
Jan
