[Proj] question about rotation

Gerald Evenden gerald.evenden at verizon.net
Mon Feb 7 19:41:15 EST 2005

This email is a little unclear however I will chance a few comments.

For Oblique Stereographic are do you want a projection that uses an 
Gaussian sphere?  If so, then use "+proj=strerea".  Sterea projection 
is more commonly
used outside of the US.

Cartesian output/input of the projection library is easting and 
northing synonymous with
x and y axis.  Sorry, no other option.

Full specification of Oblique Stereographic projection would be:

+proj=sterea  (optionally stere)
+lat_0=, +lon_0=  latitude, longitude of center of projection
k_0=  scale factor at origin
x_0=, y_0=  false easting, northing

On Feb 7, 2005, at 12:47 PM, Roman Kazmin wrote:

> Hi anybody.
> I'm beginner in LibProjj4. I have coordinate system and the following 
> parameters:
> sprintf(strProj, "+proj=stere +ellps=WGS84 +lat_0=%.9f +lon_0=%.9f 
> +units=m", lat1, lon1)
> FalseEasting   = 0;
> FalseNorthing = 0;
> Besides there is one parameter with which I do not know what to do. It 
> is orientation. As I know it decsribes the orientation of the grid 
> i.e., the east longitude value of the meridian which is parallel to 
> the y-axis (or columns of the grid) along which latitude increases as 
> the y-coordinate increases.
> I want to receive transformation of coordinates from given to latitude 
> and a longitude.
> Thanks all.
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Jerry and the low riders: Daisy Mae and Joshua.
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absence from Jerusalem of a lunatic asylum." Havelock Ellis, 1914

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