On 11/10/2007, Jeff Whitaker <[EMAIL PROTECTED]> wrote:

> Adam:  I assume your data is on a latitude-longitude grid?  You've asked
> for a mollweide projection centered on the Greenwich meridian.  Your
> data is not centered on Greenwich - but the error message is trying to
> say that you can shift your grid (with the shiftgrid function) so that
> is has the same orientation as the map projection region.  This only
> comes into play with global projections that 'wrap-around' at the edges,
> like the mollweide and mercator projections.  The orthographic
> projection does not 'wrap around' - hence you don't get the error message.

Thanks, that makes sense now.

Cheers

Adam

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