****************************************************************************** BSW Electronic Mail 20-Aug-1999 19:35:02 CET Message Number 0074 ****************************************************************************** Author: Stefan Schaer Subject: Datum file Dear colleagues, I changed the inverse flattening associated with ITRF93 to ITRF97 in our datum file from 298.2573336 to 298.2572221 and copied the new file to ftp://ubeclu.unibe.ch/aiub$ftp/bswuser/gen/datum. Thanks to Paul Denys, University of Otago, New Zealand, for pointing out that the reference ellipsoid associated with the ITRS is GRS80. In fact, according to the IERS Conventions (1996), the use of the GRS80 ellipsoid is "only" recommended. Best regards, Stefan Schaer -------------------------------------------------------------------------------- Dr. Stefan Schaer Phone : ++41-31-631-8591 Astronomical Institute Fax : ++41-31-631-3869 University of Berne E-mail : stefan.schaer@aiub.unibe.ch Sidlerstrasse 5 FTP : ftp://ubeclu.unibe.ch/aiub$ftp/ CH-3012 Berne Web : http://www.cx.unibe.ch/aiub/ Switzerland -------------------------------------------------------------------------------- How does the ionosphere currently develop? Look at Web site: ionosphere.html [Mailed from: sschaer@ubeclu.unibe.ch (Stefan Schaer)]