[OSRS-PROJ] WGS84/GEODETIC Projection

[Brian Hall]

Hiya!

Thanks for the quick reply!!

We are trying to translate lat/long pairs (in degrees) to x,y coordinates
(in feet) to be used by our 3D Graphics environment.

This is our current setup:

	char longMerd[20];

	if (point._long > 0.0)
		sprintf(longMerd, "+lon_0=%de", (int)point._long);
	else
		sprintf(longMerd, "+lon_0=%dw", (int)abs(point._long));

	char *args[] = {"proj=utm", "ellps=clrk66", longMerd};

	_projection = pj_init(3,args);

      for(;;) // all points to project
	{
		UV projectCoords;

		projectCoords.u = DEG2RAD(point._long);
		projectCoords.v = DEG2RAD(point._lat);
		projectCoords   = pj_fwd(projectCoords, _projection);

		x = projectCoords.u
		y = projectCoords.v
	}

This is working great except now we have some images that we are drawing
paths on that are in the WGS84/GEODETIC projection.  We would like to just
change out the projection to use this projection instead of Clark 1866.

Brian

-----Original Message-----
From: owner-osrs-proj at remotesensing.org
[mailto:owner-osrs-proj at remotesensing.org]On Behalf Of Frank Warmerdam
Sent: Wednesday, November 22, 2000 1:47 PM
To: osrs-proj at remotesensing.org
Subject: Re: [OSRS-PROJ] WGS84/GEODETIC Projection


Brian Hall wrote:
>
> Hello,
>
> Can PROJ.4 do the WGS84/GEODETIC projection?  If so, what is the init
> string?

Brian,

The proj command translates between projection coordinates (in a defined
projection), and geodetic coordinates in the same datum/ellipsoid.  So
what are you wanting to translate to/from WGS84/Geodetic?

If you need to do datum shifting there is experimental support for that
in the new cs2cs program.  Let me know if that's what you need.

Best regards,

---------------------------------------+------------------------------------
--
I set the clouds in motion - turn up   | Frank Warmerdam,
warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerda
and watch the world go round - Rush    | Geospatial Programmer for Rent
----------------------------------------
PROJ.4 Discussion List
See http://www.remotesensing.org/proj for subscription, unsubscription
and other information.

----------------------------------------
PROJ.4 Discussion List
See http://www.remotesensing.org/proj for subscription, unsubscription
and other information.