w3fb06.f File Reference

Lat/lon to pola (i,j) for grib. More...

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

Detailed Description

Lat/lon to pola (i,j) for grib.

Author

John Stackpole

Date

1988-01-01

Definition in file w3fb06.f.

Function/Subroutine Documentation

w3fb06()

subroutine w3fb06	(		alat,
			alon,
			alat1,
			alon1,
			dx,
			alonv,
			xi,
			xj
	)

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

w3fb06() is the reverse of w3fb07(). 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]	ALAT	Latitude in degrees (negative in southern hemis)
[in]	ALON	East longitude in degrees, real*4
[in]	ALAT1	Latitude of lower left point of grid (point (1,1))
[in]	ALON1	Longitude of lower left point of grid (point (1,1)) all real*4
[in]	DX	Mesh length of grid in meters at 60 deg lat must be set negative if using southern hemisphere projection. 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 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]	XI	I Coordinate of the point specified by alat, alon.
[out]	XJ	J Coordinate of the point; both 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 41 of file w3fb06.f.