[Proj] args list for initializing projections

[Frank Warmerdam]

Sue Dettling wrote:
> Are the projection parameters listed for each projection
> on http://www.remotesensing.org/geotiff/proj_list/transverse_mercator.html
> a complete list of the parameters needed to initialize
> a projection or is this just a partial list. I am wondering if
> you also need datum=* or ellps=* or whether there are default values
> if these are not set.

Sue,

The page lists the projection method parameters for transverse mercator,
but there are many other standard options like ellipse, datum, and
linear units which can also come into play.

If properly installed the ellipse/datum should default to WGS84, but this
depends on finding a defaults file at runtime.  If this isn't found you
would need to provide the information.
eg.
+datum=WGS84
or
+ellps=WGS84

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/~warmerdam
and watch the world go round - Rush    | President OSGeo, http://osgeo.org