w3fb08.f File Reference

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

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Functions/Subroutines
subroutine	w3fb08 (alat, alon, alat1, alon1, alatin, dx, xi, xj)
	Converts a location on earth given in the coordinate system of latitude/longitude to an (i,j) coordinate system overlaid on a mercator map projection w3fb08() is the reverse of w3fb09() uses grib specification of the location of the grid.

Detailed Description

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

Author

John Stackpole

Date

1988-03-01

Definition in file w3fb08.f.

Function/Subroutine Documentation

w3fb08()

subroutine w3fb08	(		alat,
			alon,
			alat1,
			alon1,
			alatin,
			dx,
			xi,
			xj
	)

Converts a location on earth given in the coordinate system of latitude/longitude to an (i,j) coordinate system overlaid on a mercator map projection w3fb08() is the reverse of w3fb09() uses grib specification of the location of the grid.

Program history log:

• John Stackpole 1988-03-01
• 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 corner of grid (point (1,1)).
[in]	ALON1	Longitude of lower left corner of grid (point (1,1)) all real*4.
[in]	ALATIN	The latitude at which the mercator cylinder intersects the earth.
[in]	DX	Mesh length of grid in meters at alatin.
[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

1988-03-01

Definition at line 31 of file w3fb08.f.