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As part of a geo-indexing script, I'd like to add in support for numerous .laz files we have sitting around on our SAN. The only intent of the handler is to grab the filename/path, the SRS, and the extent of the point cloud file. I do not need to do any processing or analysis on the dots.

So I'm able to do

from laspy.file import File

my_file = File("path/to/file.laz", mode='r')

and it loads the files without error. I can call the File.header property, but have no idea how to "get into" it to extract values or calculate the min/max X/Y.

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1 Answer 1

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5

You should use min and max property of header.

from laspy.file import File

f = File("path/to/file.laz", mode='r')
h = f.header

# h.min: [min_x, min_y, min_z] - h.max: [max_x, max_y, max_z]
extent = [*h.min, *h.max] # extent: [min_x, min_y, min_z, max_x, max_y, max_z]
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  • Thanks Kadir; is there a way for me to discern the spatial reference from the header? Or just dump all the header contents as a dict and look through them? I was able to grab the min/max as you showed but it was just line and sample, not coordinate information.
    – auslander
    May 22, 2020 at 20:49
  • I've just looked at laspy docs. It says "srs is not implemented". So, you should probably dump the header contents or use liblas.
    – Kadir Şahbaz
    May 22, 2020 at 21:20
  • Great. How do I dump the header contents? That was part of the question alluded to in my original question on how to get into the header to examine all the values.
    – auslander
    May 23, 2020 at 14:54
  • 2
    Use PDAL to get your SRS info.
    – Howard Butler
    May 29, 2020 at 1:09
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    @HowardButler how do I use PDAL to get my SRS info?
    – auslander
    Oct 16, 2020 at 16:44

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