| Re: google earth projections [message #63299 is a reply to message #63180] |
Mon, 03 November 2008 16:42   |
R.G. Stockwell
Messages: 363
Registered: July 1999
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Senior Member |
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<liamgumley@gmail.com> wrote in message
news:2f8cf74c-b86f-4ece-bb13-694bf3badde3@n1g2000prb.googleg roups.com...
On Nov 1, 2:20 pm, "R.G. Stockwell" <notha...@noemail.com> wrote:
> Does anyone know the IDL map projection to use to make a
> ground overlay in a kml file (to be viewed by a geobrowser such
> as google earth?)
>
> I've googled and have seen many different things stated,
> so I am not sure if my use of cylindrical projection is right.
>
> My figures are off, in that my continents do not match earth's continents
> I am initiallty making a full globe image (-90 to 90 lat , -180 to 180
> lon)
> similar to the big blue marble example.
>
> http://www.gearthblog.com/blog/archives/2006/11/blue_marble_ time_ani....
>
> but my image of the global map, does not reproduce the continents like
> in those
> images.http://mw1.google.com/mw-earth-vectordb/kml-samples/b mng12/files/BMNG...
>
> cheers,
> bob
> This is the projection used by Google Earth overlays:
> http://en.wikipedia.org/wiki/Plate_carre_projection
Thanks Liam,
one problem is in converting from the uv coords in the plot window,
(which range from -2*10^7 to 2*10^7, and -1*10^7 to 1*10^7).
to my data coordinates that my data is in (drawing polygons in lat and lon).
Where do i get the info for that coordinate transformation?
I can overlay the continents nicely, and grid and label it, perhaps I just
have to dig into those routines to see how they do it.
Cheers,
bob
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