[Liblas-devel] Retrieving User Data/Point source ID with LibLAS
hobu.inc at gmail.com
Wed Apr 7 11:18:24 EDT 2010
On Apr 7, 2010, at 10:17 AM, Aaron Reyna wrote:
> Thanks Howard,
> So, does that mean that libLAS is incapable of extracting that information based on it's current version? Maybe I didn't understand your reply.
Currently released version, 1.2.1, does not have the capability to provide *both* the point source id and the user_data, only the user_data. The latest version in the repository does have this capability, however.
> I ran it the other night and looked at the results, it seems to be correct. Striations could be seen in the raster I created that looked similar to that in the intensity raster.
Excellent, glad you are having success.
> Oh, and it should be noted that only Raw .las files contain this information in the User Data/Point Source Id.
User data and point source id are not the same thing, and my grouping them together as equivalent was incorrect. user data is a single byte per point, and point source id is two bytes of data per point.
> When those files are imported into usable delineations and grounded, (as in, not per flight line) the Point Id is written over with gps time.
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