[gradsusr] Error: vector/barb not compatible with current map projection

[Matt Alonso]

Hi Jennifer,

Thank you so much for the prompt reply.

Ok that makes sense.  Out of curiosity, are there any plans to address the
issue so vectors, etc can be plotted on those projections?

Thanks,
Matt

On Thu, Aug 2, 2012 at 1:05 PM, Jennifer Adams <jma at cola.iges.org> wrote:

>
> On Aug 2, 2012, at 12:29 PM, Matt Alonso wrote:
>
> Hi All,
>
> I recently upgraded my RHEL5 binaries to grads 2.0.1 from 2.0.a7.1 and
> upon doing so I started getting the following error message when attempting
> to plot vectors using the orthographic projection:
>
> Error: vector/barb not compatible with current map projection
>
> I did see the entry in the Changelog talking about vectors: "Disabled
> erroneous vector/barb drawing in some projections (mollweide, orthographic,
> and robinson)".  However, I interpreted that as saying that some erroneous
> vectors were showing up in those projects but that the issue had been
> resolved.
>
> No.
>
>   Did that entry actually mean that vectors are no longer being drawn for
> those projections?
>
> Yes.
> While working on the streamline code, Brian discovered that the
> transformation of vector angles when drawing on some map projections always
> assumed that the lat/lon lines cross at right angles. Projections for which
> this is not the case were disabled.
> --Jennifer
>
>
>
>
>  --
> Jennifer M. Adams
> IGES/COLA
> 4041 Powder Mill Road, Suite 302
> Calverton, MD 20705
> jma at cola.iges.org
>
>
>
>
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