[R] curvilinear grid

[elw at stderr.org]

> The idea is that you're modeling an irregular shaped object, a body of 
> water, a river or estuary, say.  It's fairly common practice to use a 
> grid squished and rotated so that the main flow is along one axis, and 
> the other axis spans the flow in most spots.  So there is a single 
> transformation that gets you from a rectangular grid to the shape of 
> your estuary, but there isn't a tidy analytical way to describe it, like 
> there is with a map projection.  Instead there is an x and y for each 
> grid point, and the cell dimensions vary all over the place.
>
> spplot, in the sp package seems almost to do what I'm after, but I can't 
> figure out if there is a way to invoke it that does what I want, or if 
> I'm barking up the wrong tree.


Ask on R-sig-geo?  I haven't seen a query from you come through over 
there... and that would be the logical place to ask questions about the sp 
package and similar bits...

--e