<HTML dir=ltr><HEAD><TITLE>Re: [Proj] A bit of help with French, por favor.</TITLE>
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<DIV dir=ltr><FONT face="Times New Roman" color=#000000 size=2>The sphère de courbure has an intermediate sphere with a radius equal to the<BR>radius of curvature at the touching point - or something like that.<BR></FONT></DIV>
<DIV dir=ltr><FONT face="Times New Roman" color=#000000 size=2>That's the Gaussian Sphere.</FONT></DIV>
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<DIV dir=ltr><FONT face="Times New Roman" color=#000000 size=2>Cliff Muginer</FONT></DIV>
<DIV dir=ltr><FONT face="Times New Roman" color=#000000 size=2>LSU</DIV></FONT></DIV>
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<FONT face=Tahoma size=2><B>From:</B> proj-bounces@lists.maptools.org on behalf of OvV_HN<BR><B>Sent:</B> Fri 20-Jun-08 12:41<BR><B>To:</B> PROJ.4 and general Projections Discussions<BR><B>Subject:</B> Re: [Proj] A bit of help with French, por favor.<BR></FONT><BR></DIV>
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<P><FONT size=2>This has been discussed earlier in the case of the French Laborde<BR>projections.<BR>(I have currently no access to my files or emails, so from memory...)<BR>If I remember correctly, the libproj stmerc projection was the same as one<BR>of the 3 French (IGN) Laborde projections.<BR>I assume that these projections are double projections and work with an<BR>intermediate sphere.<BR>The sphère de courbure has an intermediate sphere with a radius equal to the<BR>radius of curvature at the touching point - or something like that.<BR>The sphère équatorial has a radius equal to the semi-major (equatorial) axis<BR>of the ellipsoid.<BR>The sphère bitangente touches the ellipsoid twice, I guess. Don't ask me<BR>where, but this could give a clue looking at the formulae.<BR>See:<BR><A href="http://www.ign.fr/rubrique.asp?rbr_id=1700&lng_id=FR#68096">http://www.ign.fr/rubrique.asp?rbr_id=1700&lng_id=FR#68096</A><BR>and NT/G 73 for the French Laborde projection formulae.<BR>Hope this will help.<BR><BR>Oscar van Vlijmen<BR><BR>----- Original Message -----<BR>From: "Gerald I. Evenden" <geraldi.evenden@gmail.com><BR>To: "PROJ.4 and general Projections Discussions" <proj@lists.maptools.org><BR>Sent: Friday, June 20, 2008 5:28 PM<BR>Subject: [Proj] A bit of help with French, por favor.<BR><BR><BR>>I have run into three phrases labeling projection states:<BR>><BR>> cas de la sphere de courbure<BR>> cas de la sphere equatoriale<BR>> cas de la sphere bitangente<BR>><BR>> The equitorial case seems obvious, the translation web site can't come up<BR>> with<BR>> anything for bitangente and "curve" for courbure does not mean anything to<BR>> me.<BR>><BR>> Any ideas would be helpful.<BR>><BR>><BR><BR><BR>_______________________________________________<BR>Proj mailing list<BR>Proj@lists.maptools.org<BR><A href="http://lists.maptools.org/mailman/listinfo/proj">http://lists.maptools.org/mailman/listinfo/proj</A><BR></FONT></P></DIV></BODY></HTML>