[OSRS-PROJ] Roussilhe Oblique Stereographic

Gerald Evenden gerald.evenden at verizon.net
Fri Mar 19 09:23:16 EST 2004

As for the scale errors, this is not necessarity a problem.  Scale 
in both axis agree to precision presented thus demonstating conformal
behavior.  Note these values are computed by numerical derivatives
and subject to the problems of precision of the method used.  I use this
method when there is no other way to check the behavior of the]
projection.  That is why the -V option is included in the program 

As to benchmark values:  the ideal method is to use the method used
by the government to compute their conversions----or anything officially
recognized.  Sometimes a source is listing of points in a grid with both
their geodetic and grid systems values.  If someone has access to
ESRI software they may have it and you could run a couple points
through their system.

On Mar 19, 2004, at 6:11 AM, Maciek Sieczka wrote:

>> PS: x and y seem to be reversed but this is common as one goes east.
> they are reversed in, AFAIK, all Polish grids (there are 5 kinds of 
> them or so)
>> Current forward for the Polish stereographic shows 2.6x10^-5 %
>> error and conformality with the -V option.
> I have no experience - is it much or not?
>> I desperately NEED Polish benchmarks for any one of the four
>> stereographic zones.
> tell me how to do this benchmark
> Maciek Sieczka
Jerry and the low riders: Daisy Mae and Joshua

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