[GRASSLIST:3329] Re: MrSid Location

Sun May 2 08:05:24 EDT 2004

> On the Web I have seen both GRS80 and WGS84 ellipsoids as used by this 
> images outside USA. As I understand, these ellipsoids are similar but 
> somewhat differents.

GRS80 and WGS84 are almost identical
in the GIS applications the difference has no practical meaning AFAIK

from the usr\local\grass5\etc\ellipse.table:
grs80  "Geodetic Reference System 1980" a=6378137.000 f=1/298.257222101
wgs84  "World Geodetic System 1984" a=6378137.000 f=1/298.257223563

Maciek