Ibrahim,<br><br>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.<br>
<br><<a href="http://liblas.org/start.html#reprojecting-an-las-file">http://liblas.org/start.html#reprojecting-an-las-file</a>><br><br>Howard<br><br><div class="gmail_quote">On Tue, Nov 9, 2010 at 7:50 AM, Ibraheem Ali <span dir="ltr"><<a href="mailto:ialhakeem@gmail.com">ialhakeem@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div>Dear All,</div>
<div> </div>
<div>I have downloaded the new release of "libLAS (libLAS 1.6.0b2)" from "OSGeo4W" and run the vertical datum conversion command as follow:</div>
<div> </div>
<div>las2las gal_000052.las --a_srs EPSG:32615 --t_srs EPSG:32615+5703</div>
<div> </div>
<div>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).</div>
<div> </div>
<div>It worked great, thanks for the great effort.</div>
<div> </div>
<div>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).</div>
<div> </div>
<div>Thank you very much,</div>
<div> </div>
<div>With best regards,</div>
<div>Ibraheem</div>
<div> </div>
<div> </div>
<div> </div>
<div>Below some sample lines from the original file, and the results from liblas, and V-datum</div>
<div> </div>
<div>Original file (WGS 84 UTM15, ellipsoidal height):</div>
<div> </div>
<div>293999.95 3219406.51 -25.55<br>293999.9 3219406.56 -25.53<br>293999.77 3219406.67 -25.53<br>293999.72 3219406.71 -25.53<br>293999.71 3219406.72 -25.51</div>
<div> </div>
<div>Liblas Conversion Result (WGS 84 UTM15, NAVD 88)::</div>
<div> </div>
<div>293999.95 3219406.51 0.94<br>293999.9 3219406.56 0.96<br>293999.77 3219406.67 0.96<br>293999.72 3219406.71 0.96<br>293999.71 3219406.72 0.98</div>
<div> </div>
<div>V-Datum Conversion Result (WGS 84 UTM15, NAVD 88):</div>
<div> </div>
<div>293999.95 3219406.51 0.9364 <br>293999.9 3219406.56 0.9564 <br>293999.77 3219406.67 0.9564 <br>293999.72 3219406.71 0.9564 <br>293999.71 3219406.72 0.9764 </div>
<div> </div>
<div> </div>
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<br></blockquote></div><br>