m.region.ll <main>    GRASS Reference Manual   <main> m.region.ll



NAME
     m.region.ll - Converts Universal Transverse Mercator (UTM)
     coordinates falling within the current geographic region
     from UTM coordinates to geographic (latitude/longitude)
     coordinates.
     (GRASS Data Import/Processing)

SYNOPSIS
     m.region.ll
     m.region.ll help
     m.region.ll spheroid=name

DESCRIPTION
     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.

     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:

	  m.region.ll help

     A list of available spheroids will be printed on the screen.

     AVAILABLE SPHEROIDS
     (The on-line listing includes only the spheroid names.)	  |
     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

EXAMPLE
	  m.region.ll spheroid=clark66

     Results:




GRASS 5.0beta6	      GRASS Development Team			1






m.region.ll <main>    GRASS Reference Manual   <main> m.region.ll



	  WINDOW   4928000.00N	 609000.00E   ZONE 13
		   4914000.00S	 590000.00W

      44.30.06N	   44.29.57N
     103.52.04W	  103.37.44W

      44.22.32N	   44.22.23N
     103.52.13W	  103.37.55W

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

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.

SEE ALSO
     m.datum.shift, m.ll2u, m.u2ll, r.in.ll

AUTHOR
     Michael Shapiro, U.S. Army Construction Engineering Research
     Laboratory































2		      GRASS Development Team	   GRASS 5.0beta6