[GRASS5] [bug #2537] (grass) aitoff/winkel tripel fails on rasters

[Glynn Clements]

William K wrote:

> A question about the inverse projection thing - is that a PROJ 
> limitation, or a general limitation of the Aitoff/Winkel Tripel 
> projection?

I'm not sure how to interpret that question.

The proj library includes inverses for some projections, but not all,
and not for Aitoff or Winkel Tripel.

I suspect that these projections don't have a clearly defined inverse,
i.e. the inverse can't be defined in terms of an algebraic expression,
and there isn't a "standard" approximation.

-- 
Glynn Clements <glynn.clements at virgin.net>