defining projections

[Doyon, Jean-Francois]

Ben,

You have to do a few things:

define the projection of the output image, by defining a "PROJECTION"
section in the "root" of the mapfile (Not within any object).

Then, within each layer deifnition you can specify WHICH projection each
layer is in, and yes, you should consult the PROJ.4 documentation to find
out the exact parameters for whatever projection you are using.
In your case you might want to check out one of the following :

mpoly : Modified Polyconic
poly : Polyconic (American)
rpoly : Rectangular Polyconic

I also strongly recommend you experiment with the ocmmand line tool first !

For geographic projection, simply use :
PROJECTION
	geographic
END

Good luck !
J.F.

> ----------
> From: 	Ben Lewis[SMTP:benlewis1 at hotmail.com]
> Sent: 	Tuesday, October 31, 2000 3:14 PM
> To: 	mapserver-users at lists.gis.umn.edu
> Subject: 	defining projections
> 
> Mapserver users,
> First I want to say I am really impressed with MapServer. It seems to be 
> very fast and robust. I got the demo version of mapserver running on NT,
> and 
> I've been able to set up a site pointing at other data in the UTM 
> projection, but am having trouble getting data in Polyconic space to 
> display.  There is no error message, just does not show up. What is the 
> syntax for referring to data in:
> 
> Polyconic projection
> elipsoid GRS80
> Long of origin -77:45:00
> Lat of origin  40:55:30
> Units meters
> Extent is minx, miny, maxx, maxy?
> 
> Also if I go with geographic how to I specify extent?  Does PROJ4 handle 
> degrees?
> 
> Am I in effect asking about PROJ4 commands here?  Would this kind of 
> information be in the PROJ4 documentation?
> 
> - Ben Lewis
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