Are you by chance confusing LAStools with libLAS?
LAStools has a partial implementation of some geotiff key reading/
writing. libLAS, which implements the command line utilities of
LAStools, uses libgeotiff for geotiff key reading/writing and provides
a much more complete implementation.
Your results will differ depending on which one (LAStools or libLAS)
you are using.
Howard
On Jul 23, 2009, at 3:00 PM, Patel, Ronak Avinash (US SSA) wrote:
I am using lasinfo.exe to display the fields. I downloaded lastools
separately for Windows.
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Howard
Butler
Sent: Thursday, July 23, 2009 12:55 PM
To: [email protected]
Subject: Re: [Liblas-devel] LAS file Coordinate Systems
On Jul 23, 2009, at 1:39 PM, Patel, Ronak Avinash (US SSA) wrote:
Howard and Mateusz,
Thanks for the help...really appreciate it. Haven't really found many
people out there that know the low levels as much as you guys do.
I was looking at the LAS 1.2 spec and it says the Georeferencing
information requires the GeoKeyDirectoryTag Record.
I am able to write that tag out but I see that lasinfo always shows
the
version to be 0.0.0 regardless of what I put in those fields.
According to the spec, the data should be arranged:
wKeyDirectoryVersion = 1 (2 bytes)
wKeyRevision = 1 (2 bytes)
wMinorRevision = 0 (2 bytes)
wNumberOfKeys = the number of sets of 4 unsigned shorts to follow
I write out the above shorts and 0 out the rest of the data byte
array
but lasinfo always shows 0.0.0 as the version.
Is the spec wrong? Or is something else going on here that lasinfo
and
libLAS are doing??
Are you linking libLAS with libgeotiff when you compile? libLAS
completely ignores georeferencing if libgeotiff is not linked at
compile time.
Howard
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