[mapserver-users] project onto a globe?
Pericles S. Nacionales
nacional at biosci.cbs.umn.edu
Tue Nov 26 15:37:23 PST 2002
OK, you got me thinking on this one. So, here's the output projection
you'd want to include in your map file. I don't know if it'll work.
PROJECTION
"proj=ortho"
"ellps=WGS84"
"lat_0=52.0000"
"lon_0=0.0000"
"x_0=0.00"
"y_0=0.00"
END
You can change the ellipse parameter to whatever spheroid you want to
use, and lat_0 and lon_0 to whatever you'd want centered--I assume you'd
want that to be UK/Europe.
Here's more info:
http://www.remotesensing.org/geotiff/proj_list/orthographic.html
(Check the note on random issues)
Let us know if it works.
-Perry
On Tue, 2002-11-26 at 13:21, Tom Hodder wrote:
>
> >If I understand correctly, what you folks in the UK call a "2D
> representation of a globe" is known as a "circle" over here
> ><g>.
>
> ;-)
>
> >
> > Tom -
> > Do you mean that you want the image to look like a globe? If so, you need
> > to use an orthographic projection. By virtue of making an image, you are
> > doing some kind of projection from the earth to the plane of the image.
> >
> >
>
> This is pretty much what I am trying to achieve.
>
> I've only starting reading about
> this stuff in the last couple of days so I'm missing chunks of information
> that are probably quite basic for experienced mappers.
>
> >You'll have to give us a little more information. MapServer supports a HUGE
> >array of map projections through PROJ4 ... so, yes, you can do it.
> >
> >See http://mapserver.gis.umn.edu/doc36/coordinates.html
>
> i going to read this thoroughly and see if what I can do with it.
>
> Thanks for the help so far.
>
> Tom
>
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