SUBROUTINE LL2UTM( LONI, LATI, Z, XX, YY ) SUBROUTINE LL2UTM( LONI, LATI, N, XX, YY ) SUBROUTINE UTM2LL( X, Y, Z, LON, LAT ) SUBROUTINE UTM2LL( X, Y, N, LON, LAT ) REAL , INTENT(IN ) :: LONI ! East longitude in decimal degrees REAL , INTENT(IN ) :: LATI ! North latitude in decimal degrees REAL , INTENT(IN ) :: X ! UTM easting in meters REAL , INTENT(IN ) :: Y ! UTM northing in meters REAL , INTENT(IN ) :: Z ! UTM zone, as a REAL INTEGER, INTENT(IN ) :: N ! UTM zone, as an INTEGER REAL , INTENT( OUT) :: XX ! UTM easting in meters REAL , INTENT( OUT) :: YY ! UTM northing in meters REAL , INTENT( OUT) :: LON ! East longitude in decimal degrees REAL , INTENT( OUT) :: LAT ! North latitude in decimal degrees
For I/O API-3.2, these are Fortran-90 generics found in
MODULE MODGCTP
(note the generic UTM-zone argument
which may be either REAL
or INTEGER
). The
routines in I/O API-3.1 and before only support the
INTEGER
form, and are declared (for 3.0 and 3.1)
in MODULE M3UTILIO
.
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 packageGCTP
,
Fortran-90 moduleMODGCTP
,
GRID2XY()
fromMODGCTP
,
XY2XY()
fromMODGCTP
,
SETSPHERE, INITSPHERES,
andSPHEREDAT
for geodetic-sphere selection, and
the I/O API wrapper-routines for LL2LAM() etc. single-precision Lambert/Lat-Lon/Mercator/Stereographic/UTM coordinate conversion routines.
USE MODGCTP
(See sample programs LATLON or PRESZ for usage examples.)
Up: Coordinate and Grid Related Routines
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