I would like to know what projections would people like
GRASS to support. Right now the projection library can
handle many projections, but programs like m.proj, v.proj
and g.setproj provide interface to only seven of them.
So please tell me which projections would you like to use
so that I can make changes.
Olga
Olga, mozhno sprosit' kakie referenz-ellipsoidy sejcas v rasporjazhenii ?
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In Mid-Europe we should have the posibility to change from "old"
Krassowskij to "new" Bessel systems when using the GK-system.
Frank Hoffmann /DD 23:35
In info.grass.user you write:
Olga, mozhno sprosit' kakie referenz-ellipsoidy sejcas v rasporjazhenii ?
----
In Mid-Europe we should have the posibility to change from "old"
Krassowskij to "new" Bessel systems when using the GK-system.
Frank Hoffmann /DD 23:35
Here is a copy of etc/ellipse.table file which containes all supported ellipsoids.
this file contains ellipsoid parameters
# format of the file is
# name a=value x=value comments
#
# where name is a single word elliposid name, a is the equatorial radius
# and x is one of
# b polar radius, f flattening, or e eccentricity squared
#
# x should be a defining parameter (as opposed to a derived parameter)
# no spaces before or after the =
# these are from [Snyder, Table 1, p.12]
australian a=6378160 f=1/298.25
clark66 a=6378206.4 b=6356583.8
grs80 a=6378137 f=1/298.257
hayford a=6378388 f=1/297
international a=6378388 f=1/297
krassovsky a=6378245 f=1/298.3
wgs72 a=6378135 f=1/298.26
# this is from naval oceanographic lab
wgs84 a=6378137 f=1/298.257223563
# these are from [Seppelin, Table 9, p.35]
bessel a=6377397.155 e=.006674372
airy a=6377563.396 e=.006670540
everest a=6377276.345 e=.0066378466
wgs66 a=6378145 f=1/298.25
# Snyder.
# John P. Snyder, "Map Projections - A Working Manual,"
# U.S. Government Printing Office, Washington DC, 1989.
# U.S. Geological Survey Professional Paper 1395
# Seppelin.
# Thomas O. Seppelin, "The Department of Defense World
# Geodetic System 1972," presented at the International
# Symposium on Problems Related to the Redefinition if
# North American Geodetic Networks, Fredericton, New
# Brunswick,Canada in May, 1974.
#these were added for g.setproj capabilities
MERIT a=6378137 f=1/298.257
IAU76 a=6378140.0 f=1/298.257
GRS67 a=6378160.0 f=1/247.247167
clark80 a=6378249.145 f=1/293.4663
hough a=6378270.0 b=6356794.343479
mercury a=6378166.0 b=6356784.283666
modif_airy a=6377341.89 b=6356036.143
modif_everest a=6377304.063 b=6356103.039
modif_merc a=6378150.0 b=6356768.337303
new_internatnl a=6378157.5 b=6356772.2
SEasia a=6378155.0 b=6356773.3205
walbeck a=6376896.0 b=6355834.8467
# sphere a=6370997.0 e=0.0
~
Vsego dobrogo, Irina