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On 2013-04-27 09:58, Wim Crols wrote :
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cite="mid:CANMJM1Pob3oYdPFubXB=B2RqX02=PSqRA7BJmT0jR_fek_dENg@mail.gmail.com"
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<div dir="ltr">On Sat, Apr 27, 2013 at 12:02 AM, A.Pirard.Papou <span
dir="ltr"><<a moz-do-not-send="true"
href="mailto:A.Pirard.Papou@gmail.com" target="_blank">A.Pirard.Papou@gmail.com</a>></span>
wrote:<br>
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<div text="#000000" bgcolor="#ffffff"> On 2013-04-26
11:20, Chris Browet wrote :<br>
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<div>The Lambert72 PROJ4 string extracted from the
prj is:<br>
<br>
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<div>+proj=lcc +lat_1=49.8333339
+lat_2=51.16666723333333 +lat_0=90
+lon_0=4.367486666666666 +x_0=150000.01256
+y_0=5400088.4378 +ellps=intl +units=m +no_defs <br>
<br>
</div>
<div>And doesn't quite work.<br>
<br>
</div>
<div>This one is ok:<br>
<br>
+proj=lcc +lat_1=51.16666723333334
+lat_2=49.83333389999999 +lat_0=90
+lon_0=4.367486666666666 +x_0=150000.013
+y_0=5400088.438 +ellps=intl
+towgs84=-99.1,53.3,-112.5,0.419,-0.83,1.885,-1.0
+units=m +no_defs<br>
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<div text="#000000" bgcolor="#ffffff">There are 4 or 5
proj4 definitions of Lambert 72 around and bugs reports.<br>
This is the correct one, I think, that I configured
Merkaartor with after much searching.<br>
<br>
</div>
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<div><br>
</div>
<div>Actually this is the one defined in proj4 now</div>
<div> </div>
<div><font face="arial, sans-serif">+proj=lcc
+lat_1=51.16666723333333 +lat_2=49.8333339 +lat_0=90
+lon_0=4.367486666666666 +x_0=150000.013
+y_0=5400088.438 +ellps=intl
+towgs84=106.869,-52.2978,103.724,-0.33657,0.456955,-1.84218,1
+units=m +no_defs</font><br>
</div>
<div><font face="arial, sans-serif"><br>
</font></div>
<div><a moz-do-not-send="true"
href="https://svn.osgeo.org/metacrs/sr.org/epsg/proj/epsg">https://svn.osgeo.org/metacrs/sr.org/epsg/proj/epsg</a><br>
</div>
<div><br>
</div>
<div style="">look for 31370</div>
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Indeed, and that is why everybody should carefully check that <a
href="http://trac.osgeo.org/proj/ticket/47">this #47 bug is
corrected in their proj.4 distribution</a> (library file
libproj0.so.0 or such) or in other sources or in any other "manual"
configuration in order to avoid producing bad work <a
href="http://lists.maptools.org/pipermail/proj/2010-January/005017.html">and
confusion like this message + replies and other discussions</a>.<br>
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cite="mid:CANMJM1Pob3oYdPFubXB=B2RqX02=PSqRA7BJmT0jR_fek_dENg@mail.gmail.com"
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<div text="#000000" bgcolor="#ffffff"> Obviously, IGN/NGI
should specify their projections' proj4 definitions on
their site.<br>
Someone should notify them.<br>
</div>
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Obviously.<br>
<br>
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Cheers<br>
<br>
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<td valign="top">André.</td>
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