Ibrahim, It is possible that things are only accurate to two decimals because the scale of your input header is only 0.01. I have been working on some example documentation that explains how to set the scale as part of the reprojection in more detail.
<http://liblas.org/start.html#reprojecting-an-las-file> Howard On Tue, Nov 9, 2010 at 7:50 AM, Ibraheem Ali <[email protected]> wrote: > Dear All, > > I have downloaded the new release of "libLAS (libLAS 1.6.0b2)" from > "OSGeo4W" and run the vertical datum conversion command as follow: > > las2las gal_000052.las --a_srs EPSG:32615 --t_srs EPSG:32615+5703 > > which basically assign (wgs84, UTM15) coordinate system to the original > file ( --a_srs EPSG:32615 ), then transform the vertical datum to NAVD 88 ( > --t_srs EPSG:32615+5703). > > It worked great, thanks for the great effort. > > I have also compared the result with the results from V-datum and they > match to the second decimal place very nicely.(sample calcs. included in > this e-mail). > > Thank you very much, > > With best regards, > Ibraheem > > > > Below some sample lines from the original file, and the results from > liblas, and V-datum > > Original file (WGS 84 UTM15, ellipsoidal height): > > 293999.95 3219406.51 -25.55 > 293999.9 3219406.56 -25.53 > 293999.77 3219406.67 -25.53 > 293999.72 3219406.71 -25.53 > 293999.71 3219406.72 -25.51 > > Liblas Conversion Result (WGS 84 UTM15, NAVD 88):: > > 293999.95 3219406.51 0.94 > 293999.9 3219406.56 0.96 > 293999.77 3219406.67 0.96 > 293999.72 3219406.71 0.96 > 293999.71 3219406.72 0.98 > > V-Datum Conversion Result (WGS 84 UTM15, NAVD 88): > > 293999.95 3219406.51 0.9364 > 293999.9 3219406.56 0.9564 > 293999.77 3219406.67 0.9564 > 293999.72 3219406.71 0.9564 > 293999.71 3219406.72 0.9764 > > > > _______________________________________________ > Liblas-devel mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/liblas-devel > >
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