No subject

GRASS user is correct.  Heaven help them if it isn't. ;-)

The term projection applies to what kind of distortion method was
used in getting part of the surface on an ellipsoid converted
to a plane surface.

>  Sharif Razzaque
>         sharif at lams.msd.lmsc.lockheed.com
>  phone: (408) 756-4358 & 756-0494

As a recap.  Formal "Coordinate Systems" like UTM, SPCS and many non-US
national systems are a way for users to plan in a comfortable,
cartesian coordinate system.  All of these systems have an associated
cartographic projection that converts these systems to and from
geographic coordinates.

Maps are displays of geographic areas and *must* use a cartographic
projection which may or may not be the same as a formal coordinate
system covering the same area.  It is helpful when the projection
of the map and the formal coordinate system coincide and thus
provide a cartesian display of the grid system on the map.

Gerald (Jerry) I. Evenden   Internet: gie at charon.er.usgs.gov
voice: (508)563-6766          Postal: P.O. Box 1027
  fax: (508)457-2310                  N.Falmouth, MA 02556-1027