Hi,
the cf-convention in Table F.1 Grid Mapping Attributes explains
false-easting/northing as:
The value added to all abscissa values in the rectangular coordinates
for a map projection.
I think it must be 'The value subtracted from all abscissa values...':
false_easting = 0 ... proj_x_axis_value(0) = -200000
is equivalent to
false_easting = 200000 ... proj_x_axis value(0) = 0
or in proj.4-term (+x_0 = false_easting):
$ proj -I +proj=stere +R=6370000
-200000 -200000
1d47'57.196"W 1d47'54.005"S
heikok@pc4027:~$ proj -I +proj=stere +R=6370000 +x_0=200000 +y_0=200000
0 0
1d47'57.196"W 1d47'54.005"S
I tested it with the netcdf-java and other programs, too.
False_easting/northing values are subtracted from the x-Axis values.
Best regards,
Heiko
--
Dr. Heiko Klein Tel. + 47 22 96 32 58
Development Section / IT Department Fax. + 47 22 69 63 55
Norwegian Meteorological Institute http://www.met.no
P.O. Box 43 Blindern 0313 Oslo NORWAY
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