[geotk] "Custom" location local projection

Martin Desruisseaux martin.desruisseaux at geomatys.fr
Fri Sep 4 04:47:54 EDT 2009

Sam B a écrit :

> I thought about orthographic because this guide 
> http://www.epsg.org/guides/docs/G7-2.pdf at page 74 says that the 
> distortion in scale is about 1 part per 10000 at 90km from the center. 
> But now you tell me that Stereographic is even better. Wow ! Do you have 
> an idea about the distortion of this projection ?

No unfortunatly :(. I was not aware neither of the behavior of Orthographic 
reported by EPSG, thanks for pointing this link.

> I guess that the units of the axes of the projectedCRS corresponding to 
> the stereographic projection are meters ?

This is at your choice. This is determined by the CartesianCS argument you pass 
to the createProjectedCRS constructor. The DefaultCartesianCS.PROJECTED constant 
defines axes in metres, but you could define an other CartesianCS with other 
axes in different units.


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