Usage of API and documentation for projection metadata in las files about laspy HOT 6 CLOSED

Sorry, hit the wrong button.

I'm agnostic about the idea of a forum, though I think it's useful to get feedback like this here. In this case, I think you've highlighted both a good feature to consider adding, and a gap in the documentation.

As far as projection information goes, you should be able to find it in the VLRs (though whether it's in a format that's immediately useful to you is another question).

userIDs = [x.user_id for x in f.header.vlrs]
recIDs = [x.record_id for x in f.header.vlrs]
# What's in a VLR?
f.header.vlrs[0].body_summary()
# Parsed data
vlrData = f.header.vlrs[0].parsed_body

Maybe if you could give some examples of the format you'd need the data in, we can get an example script put together for you to test. Once we get it ironed out, I think this is an obvious use case to add to the documentation.

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Lurker here. Hope this is an appropriate place for questions.

As far as i can tell, there is no way to write projection information (e.g. EPSG, proj4 string) into the las header using the current release of laspy. Am i correct in that assessment?

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Projection information is located in the VLRs (and/or EVLRs, depending on the file version), which are readable and writeable as a list of Laspy VLR (or EVLR) objects.

For writing projection information, the trick is to construct an appropriate VLR - a task which is insufficiently documented (and which I only vaguely remember how to do). Would you be willing to put together a specific example of data you'd like to add to a file as part of a projection task? That might help us add something useful to the docs.

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Absolutely, will get it put together tonight.

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This issue seems to have died, but I'm also interested in this. In my example, I have points with spatial reference in UTM zone 11N. How can I add this information to the VLRs using laspy?

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With #197 and #215 I consider this closed

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