.TH m.region.ll
.nh
.SH NAME
\fIm.region.ll\fR \- Converts Universal Transverse Mercator (UTM) coordinates
falling within the current geographic region 
from UTM coordinates to geographic (latitude/longitude) coordinates.
.br
\fI(GRASS Data Import/Processing)
.SH SYNOPSIS
.B m.region.ll
.br
\fBm.region.ll help\fR
.br
\fBm.region.ll spheroid\*=\fIname\fR
.SH DESCRIPTION
.I m.region.ll
takes current geographic region settings in UTM coordinates,
and converts them to geographic coordinates (i.e., latitudes and longitudes).
It also prints the length (in meters) of one arc-second at
each of the four edges of the geographic region.
The user must enter the spheroid upon which to base the
geographic coordinates.
.LP
The list of spheroids available is somewhat dynamic.  It may not
contain exactly the ones listed below.  To determine the current
list of possible spheroids, simply type in:
.LP
.RS
\fBm.region.ll help\fR
.RE
.LP
A list of available spheroids will be printed on the screen.
.LP
AVAILABLE SPHEROIDS
.br
(The on-line listing includes only the spheroid names.)
.sp .25
.TS
l|c|l|l
l|c|l|l
l|l|l|l.
Spheroid:	Semi-major axis	Eccentricity sqrd (e),	Commonly used for:
	(Equatorial Radius)	Flattening (f),	
	(a):	or Polar Radius (b):	
_
airy	a\*=6377563.396	e\*=.006670540
australian	a\*=6378160	f\*=1/298.25	Australia
bessel	a\*=6377397.155	e\*=.006674372	Japan
clark66	a\*=6378206.4	b\*=6356583.8	N. America
everest	a\*=6377276.345	e\*=.0066378466	India, Burma
grs80	a\*=6378137	f\*=1/298.257
hayford	a\*=6378388	f\*=1/297
international	a\*=6378388	f\*=1/297	Europe
krasovsky	a\*=6378245	f\*=1/298.3
wgs66	a\*=6378145	f\*=1/298.25	worldwide coverage
wgs72	a\*=6378135	f\*=1/298.26	worldwide coverage
wgs84	a\*=6378137	f\*=1/298.257223563	worldwide coverage
.TE
.SH EXAMPLE
.RS
.B "m.region.ll spheroid\*=clark66"
.RE
.LP
Results:
.in +.5i
.TS
tab(#);
l r r l.
WINDOW#4928000.00N#609000.00E#ZONE 13
#4914000.00S#590000.00W
.TE
.LP 
.TS
tab(#);
r r.
44.30.06N#44.29.57N
103.52.04W#103.37.44W

44.22.32N#44.22.23N
103.52.13W#103.37.55W
.TE

At northern edge 1 arc-second longitude\*=22.088500m
.br
At southern edge 1 arc-second longitude\*=22.135998m
.br
At western edge 1 arc-second latitude\*=30.860285m
.br
At eastern edge 1 arc-second latitude\*=30.863082m

.in -.5i
The values for the geographic coordinates are rounded to the
nearest second in this example.   They would be more precise
in the actual output that is printed on the screen.
.SH "SEE ALSO"
.I m.datum.shift,
.I m.ll2u,
.I m.u2ll,
.I r.in.ll
.SH AUTHOR
Michael Shapiro, U.S. Army Construction Engineering Research Laboratory