[Proj] Winkel Tripel Problems

[Hamish]

Mikael wrote:
> > ... I wonder why Winkel Tripel is not supported.

> Lars wrote:
> Probably because Proj.4 supports only the forward direction
> (from Long/Lat to projected coordinates).

tip o'the day:
 for rasters which won't reproject due to one-way projections, convert
each cell center to a x,y,z point, then use cs2cs (or equiv) to do the
forward projection. Regrid the reprojected swarm of points into a raster
at the other end.

In GRASS this is r.out.xyz -> m.proj (or cs2cs) -> r.in.xyz, but most
other general purpose GIS will have the same capability.

e.g.
 http://adhoc.osgeo.osuosl.org/grass/alternate_projections/earthquakes_wintri.png



Hamish