[gradsusr] Generating image overlay for Open Street Map / Mercator Projection

[Chris Slocum]

Hi Jonas,

I too have been looking for a Mercator projection to
use with something like Open Street Map. To date,
I do not think there is a public extension for a Mercator
projection but the idea has been bounced around.

I know that Weather Underground had someone
develop the projection for their WunderMap so it
is possible to do.

In the interim, you could look at the GeoTIFF option.

-Chris



On Thu, May 31, 2012 at 6:46 AM, Jonas Kaufmann <me at j0nes.de> wrote:

> Hello,
>
> I am trying to generate an image with GrADS that should cover the
> whole world. The image should be based on an forecast from the GFS
> model. I want to use this image as a layer on top of Open Street Map.
>
> I can already create an image without borders, labels etc that I can
> put on my map. However it seems that the projection still is wrong,
> e.g. the continent borders drawn by GrADS do not match the borders on
> the map. I think this might be related to the map projection used, in
> OSM this should be Mercator projection which is not available in
> GrADS. The complete script can be found at the bottom of the mail.
>
> Is there a way to make the forecast map fit on OSM?
>
>
> Thank you for your help!
>
>
> Jonas
>
>
> -------
>
> 'open gfs'
>
> 'set gxout shaded'
> 'set parea 0 11 0 8.5'
> 'set mpdraw off'
> 'set frame off'
> 'set xlab off'
> 'set ylab off'
> 'set mproj latlon'
> 'set grads off'
>
> 'set mpdset hires'
> 'set map 1 1 1'
>
> 'set lon -180 180'
> 'set lat -90 90'
>
> 'd mag(ugrd10m, vgrd10m)'
>
> 'printim world.png x512 y512'
> 'quit'
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