Martin,
This sounds very interesting! The call to LASzipper::close() most probably
comes later in my case.
I use liblas::Writer for my output, how do I access the proper LASzipper
instance from it?
Presently I do:
~MyWriterClass() {
my_liblas_writer.SetHeader( my_updated_header );
// …and then my_liblas_writer is destructed.
}
I'd like to try
~MyWriterClass() {
if( my_liblas_writer.GetHeader().Compressed() ) {
liblas::LASzipper zipper = ?????;
zipper.close();
}
my_liblas_writer.SetHeader( my_updated_header );
// …and then my_liblas_writer is destructed.
}
Best regards,
/Peder
On 27 okt 2011, at 16:09, Martin Isenburg wrote:
> 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 <[email protected]> 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
>> _______________________________________________
>> Liblas-devel mailing list
>> [email protected]
>> http://lists.osgeo.org/mailman/listinfo/liblas-devel
>>
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