Re: [Liblas-devel] ECEF?

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Re: [Liblas-devel] ECEF?

Frank Warmerdam
Keith,

I suspect the problem is that the EPSG catalogs are out of date in OSGeo4W.   Could you try the following and see if it works better?

 las2las MyFile.las –a_srs "+proj=geocent +datum=WGS84 +units=m +no_defs"  –t_srs EPSG:2151

Best regards,
Frank



On Mon, Sep 9, 2013 at 10:29 AM, Keith Williams <[hidden email]> wrote:

Hello Frank,

 

I was hoping to request some assistance on converting a LiDAR point cloud from ECEF geocentric coordinates to UTM coordinates.

 

I noticed that you have previously discussed this at http://lists.osgeo.org/pipermail/liblas-devel/2011-March/001283.html however, I am quite new to Liblas, and command line interfaces in general so am not having much luck!

 

I am using: las2las MyFile.las –a_srs EPSG:4328 –t_srs EPSG:2151 through the OSGeo4W shell and I believe that I have the GDAL and liblas trunk files loaded; when installing the OSGeo4W shell I selected every GDAL and Liblas option available.  I get the error that “ERROR 6: EPSG PCS/GCS code 4328 not found in EPSG support files.  Is this a valid EPSG coordinate system? error: could not import coordinate system into OSRSpatialReference SetFromUserInput”.

 

Thank you very much for any direction you may be willing to supply!

 

Keith

 

----------------------------
Keith Williams, EIT, LSIT
UNAVCO, Inc.
6350 Nautilus Dr. 
Boulder, CO 80301

Cell: <a href="tel:%28541%29%20224-2924" value="+15412242924" target="_blank">(541) 224-2924

[hidden email]

 




--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up   | Frank Warmerdam, [hidden email]
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Software Developer

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Re: [Liblas-devel] ECEF?

Frank Warmerdam
Keith,

Hmm.  It seems two dashe are required in front of options like --a_srs and --t_srs.

I get:

las2las srs.las --a_srs "+proj=geocent +datum=WGS84" --t_srs EPSG:2151 out.las 
error: could not import coordinate system into OSRSpatialReference SetFromUserInput


$ las2las | head -10
Input LAS file not specified!
--------------------------------------------------------------------
    las2las (libLAS 1.7.0 with GeoTIFF 1.3.0 GDAL 1.8.1 LASzip 2.1.0)

It appears the GDAL library (1.8.1) linked with las2las lacks support for the +proj=geocent.  I'm not sure how to get around that with this build of las2las.  If Howard or someone were to rebuild with the stock GDAL 1.9 on OSGeo4W I think it would be ok since the following works:
$ gdalsrsinfo "+proj=geocent +datum=WGS84" 

PROJ.4 : '+proj=geocent +ellps=WGS84 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs '

OGC WKT :
GEOCCS["Geocentric",
    DATUM["WGS_1984",
        SPHEROID["WGS 84",6378137,298.257223563,
            AUTHORITY["EPSG","7030"]],
        TOWGS84[0,0,0,0,0,0,0],
        AUTHORITY["EPSG","6326"]],
    PRIMEM["Greenwich",0,
        AUTHORITY["EPSG","8901"]]]

Best regards,
Frank

On Mon, Sep 9, 2013 at 11:26 AM, Keith Williams <[hidden email]> wrote:

Hi Frank,

 

Attempted the script that you provided and ended up with the error: too many positional options.

 

C:\Users\keithw\Desktop\TEST>las2las test.las -a_srs "+proj=geocent +datum=WGS84 +units=m +no_defs"  -t_srs EPSG:2151

error: too many positional options

 

C:\Users\keithw\Desktop\TEST>las2las test.las --a_srs "+proj=geocent +datum=WGS84 +units=m +no_defs" --t_srs EPSG:2151

error: unknown option –û

 

Thanks again,

Keith

 

 

From: [hidden email] [mailto:[hidden email]] On Behalf Of Frank Warmerdam
Sent: Monday, September 09, 2013 12:01 PM
To: Keith Williams
Cc: [hidden email]
Subject: Re: [Liblas-devel] ECEF?

 

Keith,

 

I suspect the problem is that the EPSG catalogs are out of date in OSGeo4W.   Could you try the following and see if it works better?

 

 las2las MyFile.las –a_srs "+proj=geocent +datum=WGS84 +units=m +no_defs"  –t_srs EPSG:2151

 

Best regards,

Frank

 

 

On Mon, Sep 9, 2013 at 10:29 AM, Keith Williams <[hidden email]> wrote:

Hello Frank,

 

I was hoping to request some assistance on converting a LiDAR point cloud from ECEF geocentric coordinates to UTM coordinates.

 

I noticed that you have previously discussed this at http://lists.osgeo.org/pipermail/liblas-devel/2011-March/001283.html however, I am quite new to Liblas, and command line interfaces in general so am not having much luck!

 

I am using: las2las MyFile.las –a_srs EPSG:4328 –t_srs EPSG:2151 through the OSGeo4W shell and I believe that I have the GDAL and liblas trunk files loaded; when installing the OSGeo4W shell I selected every GDAL and Liblas option available.  I get the error that “ERROR 6: EPSG PCS/GCS code 4328 not found in EPSG support files.  Is this a valid EPSG coordinate system? error: could not import coordinate system into OSRSpatialReference SetFromUserInput”.

 

Thank you very much for any direction you may be willing to supply!

 

Keith

 

----------------------------
Keith Williams, EIT, LSIT
UNAVCO, Inc.
6350 Nautilus Dr. 
Boulder, CO 80301

Cell: <a href="tel:%28541%29%20224-2924" target="_blank">(541) 224-2924

[hidden email]

 



 

--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up   | Frank Warmerdam, [hidden email]
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Software Developer




--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up   | Frank Warmerdam, [hidden email]
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Software Developer

_______________________________________________
Liblas-devel mailing list
[hidden email]
http://lists.osgeo.org/mailman/listinfo/liblas-devel
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