[Liblas-devel] srs.las

Ben Discoe bdiscoe at 510systems.com
Sat Mar 5 17:31:23 EST 2011


>> 2. In Getting Started (http://liblas.org/start.html) there is a link to
>> sample data: http://liblas.org/samples/srs.las which is 404

Howard wrote:
> These are broken right now because something has been constantly pulling[..]
> This file can be gotten from the hg repository because it is quite small..
> http://hg.liblas.org/main/raw-file/5cd75fb456fa/test/data/srs.las

Thanks.  However, there is some mystery with that file.  The Getting
Started (http://liblas.org/start.html) page says to give the command:

   lasinfo --no-check srs.las

and shows the WKT that should be displayed:

   PROJCS["WGS 84 / UTM zone 17N", [....]

However, when i give the lasinfo command on that file, i do not get
WKT displayed, or any other indication that it is UTM North Zone 17.
Perhaps there is more than one version of the srs.las file, including
that one from the repository which has no srs?

c:\Data-LAS>lasinfo --no-check srs.las
---------------------------------------------------------
  Header Summary
---------------------------------------------------------
  Version:                     1.0
  Source ID:                   0
  Reserved:                    0
  Project ID/GUID:             '00000000-0000-0000-0000-000000000000'
  System ID:                   'MODIFIED'
  Generating Software:         'TerraScan'
  File Creation Day/Year:      0/0
  Header Byte Size             227
  Data Offset:                 759
  Number Var. Length Records:  3
  Point Data Format:           1
  Number of Point Records:     10
  Compressed:                  False
  Number of Points by Return:  10 0 0 0 0
  Scale Factor X Y Z:          0.01 0.01 0.01
  Offset X Y Z:                -0.00 -0.00 -0.00
  Min X Y Z:                   289814.15 4320978.61 170.58
  Max X Y Z:                   289818.50 4320980.59 170.76
  Spatial Reference:           None
---------------------------------------------------------
  VLR Summary
---------------------------------------------------------
    User: 'LASF_Projection' - Description: ''    ID: 34735 Length: 72
    User: 'LASF_Projection' - Description: ''    ID: 34736 Length: 40
    User: 'LASF_Projection' - Description: ''    ID: 34737 Length: 256
---------------------------------------------------------
  Schema Summary
---------------------------------------------------------
  Point Format ID:             1
  Number of dimensions:        13
  Custom schema?:              false
  Size in bytes:               28
---------------------------------------------------------
  Dimensions
---------------------------------------------------------
  'X'                            --  size: 32 offset: 0
 [...]


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