[Liblas-devel] invalid point(s)

[Howard Butler]

Your -clip command is eliminating all of the points, and las2las is dumb about telling you this.

http://liblas.org/ticket/162 is a bug to clean this up, and it has been applied to the repository.

Howard

On Jan 11, 2010, at 8:48 PM, Peter Tittmann wrote:

> Hello,
> 
> I wonder if you discovered what was wrong in this scenario (http://www.mail-archive.com/liblas-devel@lists.osgeo.org/msg00202.html) . I am attempting to and select first only first returns and subset using the following:
> 
> $ las2las -i ucd_03.las -first_only -clip 409849.040000 4534962.800000 409949.04 4535062.8 -o ucd_03_fr.las
> 
> and get a similar error message:
> 
> clipped: 5135796
> Not able to fetch a point. LASReaderH is invalid: Pointer 'hPoint' is NULL in 'LASPoint_Destroy'. (3) from method LASPoint_Destroy
> 
> lasinfo on the created file returns:
> 
> ---------------------------------------------------------
> Header Summary
> ---------------------------------------------------------
> File Name: ucd_03_fr_s.las
> Version: 1.2
> Source ID: 0
> Reserved: 0
> Project ID/GUID: '00000000-0000-0000-0000-000000000000'
> System Identifier: 'MODIFICATION'
> Generating Software: 'TerraScan'
> File Creation Day/Year: 0/0
> Header Size 227
> Offset to Point Data 229
> Number Var. Length Records 0
> Point Data Format 1
> Point Data Record Length 28
> Number of Point Records 0
> Number of Points by Return 0 0 0 0 0
> Scale Factor X Y Z 0.01 0.01 0.01
> Offset X Y Z -0.000000 -0.000000 -0.000000
> Min X Y Z 409849.040000 4534962.810000 73.570000
> Max X Y Z 410860.310000 4535963.860000 239.200000
> Spatial Reference
> 
> and
> $ cat ucd_03_fr_s.las
> returns
> LASF
MODIFICATIONTerraScan��

{�G�z�?{�G�z�?{�G�z�?���ףp=�A���(�Aq=
> ��MQA>
> ׳�LQAgffff�m@�G�zdR@
> 
> Im suspicious that it might be that there is no spatial reference defined so I'm working on how to define one but wanted to ask in case om off track.
> 
> Thanks very much!
> 
> PT
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