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<p>The differences could be the "sense" of the rotation angles. Consider changing the signs and see what happens ...</p>
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<div style="DIRECTION: ltr" id="divRpF528108"><font color="#000000" size="2" face="Tahoma"><b>From:</b> proj-bounces@lists.maptools.org [proj-bounces@lists.maptools.org] on behalf of Nick Ves [vesnikos@gmail.com]<br>
<b>Sent:</b> Sunday, September 22, 2013 4:53 PM<br>
<b>To:</b> proj@lists.maptools.org<br>
<b>Subject:</b> [Proj] gis.SE: Huge differences between results for 7-param datum transform<br>
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Hi List, <br>
<br>
I've encounter the following question in gis.stackexcange [0] which is a bit theoretical and interesting.<br>
<br>
It has to do about coordinate shifting between gdal and two other commercial applications and I am too wondering whats happening.<br>
<br>
I would be very interested If someone could provide an insightful answer on what is happening <br>
<br>
Nikos</p>
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[0] <a href="http://gis.stackexchange.com/questions/72173/huge-differences-between-results-for-7-param-datum-transform" target="_blank">http://gis.stackexchange.com/questions/72173/huge-differences-between-results-for-7-param-datum-transform</a><br>
<br>
I'm trying to transform a WGS84 lat/lon point</p>
<pre style="BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 5px; LINE-HEIGHT: 18px; BACKGROUND-COLOR: rgb(238,238,238); MARGIN-TOP: 0px; PADDING-LEFT: 5px; WIDTH: auto; PADDING-RIGHT: 5px; FONT-FAMILY: Consolas,Menlo,Monaco,'Lucida Console','Liberation Mono','DejaVu Sans Mono','Bitstream Vera Sans Mono','Courier New',monospace,serif; MARGIN-BOTTOM: 10px; COLOR: rgb(51,51,51); MAX-HEIGHT: 600px; FONT-SIZE: 12px; VERTICAL-ALIGN: baseline; OVERFLOW: auto; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 5px"><code style="BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-FAMILY: Consolas,Menlo,Monaco,'Lucida Console','Liberation Mono','DejaVu Sans Mono','Bitstream Vera Sans Mono','Courier New',monospace,serif; COLOR: rgb(34,34,34); VERTICAL-ALIGN: baseline; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px">11d42'32.10629" E 5d12'56.75371" S
</code></pre>
<p style="BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px; LINE-HEIGHT: 18px; MARGIN: 0px 0px 1em; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-FAMILY: 'Helvetica Neue',Helvetica,Arial,sans-serif; WORD-WRAP: break-word; COLOR: rgb(51,51,51); CLEAR: both; FONT-SIZE: 14px; VERTICAL-ALIGN: baseline; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px">
in three different software packages (Proj4, GeoTrans and Leica GeoOffice) but I receive very big differences between the results - around few hundred meters in X and Y! Note that these variations appears only with 7 parameters not with 3.</p>
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<strong style="BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; VERTICAL-ALIGN: baseline; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px">Proj4</strong></p>
<blockquote style="BORDER-LEFT: rgb(203,212,200) 2px dotted; PADDING-BOTTOM: 10px; LINE-HEIGHT: 18px; BORDER-RIGHT-WIDTH: 0px; BACKGROUND-COLOR: rgb(233,237,231); MARGIN: 0px 0px 10px; PADDING-LEFT: 10px; PADDING-RIGHT: 10px; FONT-FAMILY: 'Helvetica Neue',Helvetica,Arial,sans-serif; BORDER-TOP-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; COLOR: rgb(51,51,51); FONT-SIZE: 14px; VERTICAL-ALIGN: baseline; QUOTES: none; PADDING-TOP: 10px">
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cs2cs +proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs +to +proj=utm +zone=32 +ellps=clrk80 +towgs84=178.3,316.7,131.5,-5.278,-6.077,-10.9792,-19.166 +south +units=m +no_defs</p>
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<p style="BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px; LINE-HEIGHT: 18px; MARGIN: 0px 0px 1em; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-FAMILY: 'Helvetica Neue',Helvetica,Arial,sans-serif; WORD-WRAP: break-word; COLOR: rgb(51,51,51); CLEAR: both; FONT-SIZE: 14px; VERTICAL-ALIGN: baseline; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px">
<strong style="BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; VERTICAL-ALIGN: baseline; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px">GeoTrans</strong></p>
<pre style="BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 5px; LINE-HEIGHT: 18px; BACKGROUND-COLOR: rgb(238,238,238); MARGIN-TOP: 0px; PADDING-LEFT: 5px; WIDTH: auto; PADDING-RIGHT: 5px; FONT-FAMILY: Consolas,Menlo,Monaco,'Lucida Console','Liberation Mono','DejaVu Sans Mono','Bitstream Vera Sans Mono','Courier New',monospace,serif; MARGIN-BOTTOM: 10px; COLOR: rgb(51,51,51); MAX-HEIGHT: 600px; FONT-SIZE: 12px; VERTICAL-ALIGN: baseline; OVERFLOW: auto; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 5px"><code style="BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-FAMILY: Consolas,Menlo,Monaco,'Lucida Console','Liberation Mono','DejaVu Sans Mono','Bitstream Vera Sans Mono','Courier New',monospace,serif; COLOR: rgb(34,34,34); VERTICAL-ALIGN: baseline; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px">Delta X 178.3
Delta Y 316.7
Delta Z 131.5
Rot X -5.278
Rot Y -6.077
Rot Z -10.9792
SF = -19.166 / 0.999980834 (0.000019166)
</code></pre>
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<p style="BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px; LINE-HEIGHT: 18px; MARGIN: 0px 0px 1em; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-FAMILY: 'Helvetica Neue',Helvetica,Arial,sans-serif; WORD-WRAP: break-word; COLOR: rgb(51,51,51); CLEAR: both; FONT-SIZE: 14px; VERTICAL-ALIGN: baseline; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px">
<strong style="BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; VERTICAL-ALIGN: baseline; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px">Leica GeoOffice</strong></p>
<p style="BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px; LINE-HEIGHT: 18px; MARGIN: 0px 0px 1em; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-FAMILY: 'Helvetica Neue',Helvetica,Arial,sans-serif; WORD-WRAP: break-word; COLOR: rgb(51,51,51); CLEAR: both; FONT-SIZE: 14px; VERTICAL-ALIGN: baseline; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px">
Screenshot: <a style="BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: rgb(53,141,170); VERTICAL-ALIGN: baseline; BORDER-TOP: 0px; BORDER-RIGHT: 0px; TEXT-DECORATION: none; PADDING-TOP: 0px" href="http://imgur.com/cOTRuQB" rel="nofollow" target="_blank">http://imgur.com/cOTRuQB</a></p>
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The results are respectively:</p>
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800392 9422525 </li><li style="BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px; LINE-HEIGHT: 16px; MARGIN: 0px 0px 7px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; WORD-WRAP: break-word; VERTICAL-ALIGN: baseline; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px">
800306 9422840 </li><li style="BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px; LINE-HEIGHT: 16px; MARGIN: 0px 0px 7px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; WORD-WRAP: break-word; VERTICAL-ALIGN: baseline; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px">
800941 9422891</li></ol>
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I believe all the 3 packages use same mathematical methods for 7-param transform (Bursa-Wolf method). What could be the cause of this huge variation?</p>
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