Hi Jonas,<br><br>I too have been looking for a Mercator projection to<br>use with something like Open Street Map. To date,<br>I do not think there is a public extension for a Mercator<br>projection but the idea has been bounced around.<br>
<br>I know that Weather Underground had someone<br>develop the projection for their WunderMap so it <br>is possible to do.<br><br>In the interim, you could look at the GeoTIFF option.<br><br>-Chris<br><div></div><br>
<br><br><div class="gmail_quote">On Thu, May 31, 2012 at 6:46 AM, Jonas Kaufmann <span dir="ltr"><<a href="mailto:me@j0nes.de" target="_blank">me@j0nes.de</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hello,<br>
<br>
I am trying to generate an image with GrADS that should cover the<br>
whole world. The image should be based on an forecast from the GFS<br>
model. I want to use this image as a layer on top of Open Street Map.<br>
<br>
I can already create an image without borders, labels etc that I can<br>
put on my map. However it seems that the projection still is wrong,<br>
e.g. the continent borders drawn by GrADS do not match the borders on<br>
the map. I think this might be related to the map projection used, in<br>
OSM this should be Mercator projection which is not available in<br>
GrADS. The complete script can be found at the bottom of the mail.<br>
<br>
Is there a way to make the forecast map fit on OSM?<br>
<br>
<br>
Thank you for your help!<br>
<br>
<br>
Jonas<br>
<br>
<br>
-------<br>
<br>
'open gfs'<br>
<br>
'set gxout shaded'<br>
'set parea 0 11 0 8.5'<br>
'set mpdraw off'<br>
'set frame off'<br>
'set xlab off'<br>
'set ylab off'<br>
'set mproj latlon'<br>
'set grads off'<br>
<br>
'set mpdset hires'<br>
'set map 1 1 1'<br>
<br>
'set lon -180 180'<br>
'set lat -90 90'<br>
<br>
'd mag(ugrd10m, vgrd10m)'<br>
<br>
'printim world.png x512 y512'<br>
'quit'<br>
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</blockquote></div><br>