SUBROUTINE LL2UTM( LON, LAT, Z, X, Y )
SUBROUTINE UTM2LL( X, Y, Z, LON, LAT )
REAL X ! UTM easting in meters
REAL Y ! UTM northing in meters
INTEGER Z ! UTM zone
REAL LON ! East longitude in decimal degrees
REAL LAT ! North latitude in decimal degrees
LL2UTM() and UTM2LL() use the
(FIPS-standard) USGS National Mapping Division's General
Cartographic Transformation Package routine
GTPZ0() to do coordinate
conversion between LAT-LON and UTM coodinates.
Note that except for Cray vector machines (Y-MP, C-90, T-90,
J-90), inputs are 4-byte REAL single precision
(unlike the double precision used internally by
GCTP). Calculations for which precision is
important should use GCTP directly; further note that
by default, LL2UTM() and UTM2LL() use
the GRS 1980 spheroid to represent the surface of the Earth
(which may be important to know for high-precision calculations).
See also USGS package
GCTP,
geodetic-sphere selection routines
SETSPHERE, INITSPHERES, and SPHEREDAT,
and the I/O API wrapper-routines for
Lambert/Lat-Lon/Mercator/Stereographic/UTM
coordinate conversion, etc.
Up: Coordinate and Grid Related Routines
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