w3fb07.f File Reference

Grid coords to lat/lon for grib. More...

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Functions/Subroutines
subroutine	w3fb07 (xi, xj, alat1, alon1, dx, alonv, alat, alon)
	Converts the coordinates of a location on earth given in a grid coordinate system overlaid on a polar stereographic map pro- jection true at 60 degrees n or s latitude to the natural coordinate system of latitude/longitude w3fb07() is the reverse of w3fb06().

Detailed Description

Grid coords to lat/lon for grib.

Author

John Stackpole

Date

1988-01-01

Definition in file w3fb07.f.

Function/Subroutine Documentation

w3fb07()

subroutine w3fb07	(		xi,
			xj,
			alat1,
			alon1,
			dx,
			alonv,
			alat,
			alon
	)

Converts the coordinates of a location on earth given in a grid coordinate system overlaid on a polar stereographic map pro- jection true at 60 degrees n or s latitude to the natural coordinate system of latitude/longitude w3fb07() is the reverse of w3fb06().

uses grib specification of the location of the grid

Program history log:

• John Stackpole 1988-01-01
• Ralph Jones 1990-04-12 Convert to cray cft77 fortran.

Parameters

[in]	XI	I coordinate of the point real*4.
[in]	XJ	J coordinate of the point real*4.
[in]	ALAT1	Latitude of lower left point of grid (point 1,1) latitude <0 for southern hemisphere; real*4.
[in]	ALON1	Longitude of lower left point of grid (point 1,1) east longitude used throughout; real*4.
[in]	DX	Mesh length of grid in meters at 60 deg lat must be set negative if using southern hemisphere projection; real*4 190500.0 lfm grid, 381000.0 nh pe grid, -381000.0 sh pe grid, etc.
[in]	ALONV	The orientation of the grid. i.e., the east longitude value of the vertical meridian which is parallel to the y-axis (or columns of the grid) along which latitude increases as the y-coordinate increases. real*4 for example: 255.0 for lfm grid, 280.0 nh pe grid, 100.0 sh pe grid, etc.
[out]	ALAT	Latitude in degrees (negative in southern hemi.).
[out]	ALON	East longitude in degrees, real*4.

Note

Formulae and notation loosely based on hoke, hayes, and renninger's "map projections and grid systems...", march 1981 afgwc/tn-79/003

Author

John Stackpole

Date

1988-01-01

Definition at line 43 of file w3fb07.f.