[OSRS-PROJ] Roussilhe Oblique Stereographic

Gerald Evenden gerald.evenden at verizon.net
Wed Mar 10 14:20:10 EST 2004

Obscurity is a matter of perception.  Because I cannot walk down to my 
library and find the reference or expect them to come up with a copy in 
weeks, then it is obscure in my books.  I suspect I would have trouble 
a copy of the work in Boston.  As a minor side issue, I would rather 
deal with
an article in French rather than Polish (no offense to the Poles, 
please).  It is
just that the language has no superficial resemblance to the germanic 
or latin
based languages I am used to.  Reminds me of the Chinese article I 
tried to
work with.

For printed references readily available there is: 1) Bugayevskiy, 
Snyder p. 169,
and two versions in 2) Yang, Snyder and Tobler pp. 19--21,  3)pp 
1 and 2 my be similar but 3 is based on a transfer through Gauss-Kruger.
Interestingly, the Polish web paper I picked up gave a version that 
similar to 3.  With the Polish paper I think I could do a complete 
(forward-inverse).  The book sources mostly ignore inverse projections.

Lastly, we still do not have a concrete bibliographic reference to
Roussilhe's original work---I can't take " It is published in the open 
Hydrographique" journals of the early 1900s." to my reference desk and
expect anything but a blank look.

On Mar 9, 2004, at 10:51 PM, Clifford J Mugnier wrote:

> Roussilhe once was the Hydrographer of the French Navy.  His oblique
> stereographic projection is discussed by me in my September 2000 
> column on
> the Grids and Datums of Poland.  (www.ASPRS.org/resources.html) 
> Although
> this is a double projection similar to what the late John P. Snyder
> presented, John chose not to present the complete direct and inverse
> formulae (that he asked for and that I mailed to him in the middle to 
> late
> 1980s) since it was not a specific math model used by the United States
> Geological Survey.
> Roussilhe's work is not obscure.  It is published in the open "Annals
> Hydrographique" journals of the early 1900s.  However, you DO have to 
> be
> 	<snip>
Jerry and the low riders: Daisy Mae and Joshua

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