[Liblas-devel] Updating header information when writing a .laz file

[Martin Isenburg]

hi.

not sure at which point in liblas the call "LASzipper::close()" is
happening. but if you move the stream pointer to update the LAS header
before that call then you will corrupt the LAZ output. the
"LASzipper::close()" flushes the remaining compressor bytes and writes
the chunking table. so if you move the stream pointer, make sure you
move it back.

cheers,

martin

On Thu, Oct 27, 2011 at 7:04 AM, Peder Axensten <Peder.Axensten at slu.se> wrote:
> Maybe I've missed something, but liblas doesn't seem to update the header information when closing a file it has been writing to.
>
> So I have created a class that handles this in its destructor. The problem is that although it works on uncompressed (.las) files, this corrupts compressed (.laz) files. I guess that supplying a header with the correct information already when creating the file would work, but usually the info (e.g. bounding box, number of points by return) is not available then.
>
> Are there any plans to make liblas update the header information 'automagically'?
> Is the issue with corrupt .laz files known?
>
> I've tried it on 1.7.0b2 and on the latest (this morning) from git.
>
> Best regards,
>
> Peder Axensten
> Research engineer
>
> Swedish University of Agricultural Sciences
> Dept. of Forest Resource Management
> Forest Remote Sensing
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