[Proj] Re: Proj Digest, Vol 49, Issue 27

[Jay Hollingsworth]

Per http://www.generals.dk/general/Laborde/Jean/France.html 
Brigadier-General Jean Laborde lived from 1882-1964.

The connection to Madagascar is too strange to be random. They must 
have been related.




Jay


At 11:02 AM 6/26/2008, you wrote:
>Date: Wed, 25 Jun 2008 15:55:08 -0400
>From: "Gerald I. Evenden" <geraldi.evenden at gmail.com>
>Subject: [Proj] Gauss-Schreiber: the continuing story
>To: "PROJ.4 and general Projections Discussions"
>         <proj at lists.maptools.org>
>Message-ID: <200806251555.08948.geraldi.evenden at gmail.com>
>Content-Type: text/plain;  charset="us-ascii"
>
>Mugnier's Chap. 3  of *The Mathematics of Photogrametry* claims that the
>Gauss-Schreiber projection is just an additional truncation of the Taylor
>series Gauss-Kruger---like the Gauss-Boaga but one step further.
>
>However, referring to p. 163 of *Map Projections---A reference manual* by
>Bugayevskiy and Snyder:
>
>"The Gauss-Schreider projection was developed about 1880 and used for the
>Prussian land survey.  It consists of a double conformal transformation of
>the  ellipse onto the sphere and then of the sphere onto the plane using the
>spherical transverse Mercator projection.  The central merdian varies in
>scale."
>
>And, of course, we have the IGN claim with Laborde in NT/G 73.  I am not sure
>what the timing was but because Laborde's Madegascar efforts were circa 1929
>then the best he can probably claim is rediscovering the projection.  The
>Madagascar should not be confused with the NT/G 73 and I am only  using it as
>a reference to one period where we know he was active as I do not have his
>birth-death dates.
>
>I am now of the opinion that libproj4's original designation of the 
>projection
>is correct and a only a documention note should be made that it may have also
>have been used by Laborde at a later date.
>
>More comments on Gauss-Schreiber's truncated Taylor series later.
>
>--
>The whole religious complexion of the modern world is due
>to the absence from Jerusalem of a lunatic asylum.
>-- Havelock Ellis (1859-1939)  British psychologist


Jay Hollingsworth

Seabed Portfolio Manager and
Principal Data Architect
Schlumberger Information Solutions
phone: 713 513 8854 fax: 713 513 2093