Re: new map projections in next release

The old Mollweide (which we have always tried to be careful to call a
Mollweide-type) is a bit more than "not quite correct": Like a true
Mollweide, it has an elliptical perimeter twice as wide as it is high
(though with different dimensions) and its parallels are straight and
horizontal, as in a true Mollweide, but the shapes of the land masses
are noticeably different. Once I had the true Mollweide working and
could see the two projections side-by-side, it became much more
evident to me how different they really are.

Dave Kennison

On Sep 12, 2008, at 8:51 PM, Mary Haley wrote:

> I'm pleased to announce that we have added some new map projections
> (spurred by a user request) for the next release of NCL: Winkel
> tripel, Hammer, and Aitoff.
>
> You can see some images by looking at example 17:
>
> http://www.ncl.ucar.edu/Applications/maponly.shtml#ex17
>
> This is also a heads up that we have replaced our Mollweide projection
> with a new and improved one. The old one was not quite correct and
> used simpler math. You will still be able to get the old projection by
> setting the "mpProjection" resource to "PseudoMollweide".
>
> Look at example 18 on the same page to compare the old and new
> Mollweide projections.
>
> --Mary
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Received on Fri Sep 12 2008 - 22:11:32 MDT