[mapserver-users] project onto a globe?

[Pericles S. Nacionales]

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
>