w3fb11.f File Reference

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

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Functions/Subroutines
subroutine	w3fb11 (alat, elon, alat1, elon1, dx, elonv, alatan, 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 lambert conformal tangent cone projection true at a given n or s latitude.

Detailed Description

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

Author

John Stackpole

Date

1988-11-25

Definition in file w3fb11.f.

Function/Subroutine Documentation

w3fb11()

subroutine w3fb11	(		alat,
			elon,
			alat1,
			elon1,
			dx,
			elonv,
			alatan,
			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 lambert conformal tangent cone projection true at a given n or s latitude.

w3fb11() is the reverse of w3fb12(). uses grib specification of the location of the grid

Program history log:

• John Stackpole 1988-11-25
• Ralph Jones 1990-04-12 Convert to cft77 fortran.
• Ralph Jones 1994-04-28 Add save statement.

Parameters

[in]	ALAT	Latitude in degrees (negative in southern hemis).
[in]	ELON	East longitude in degrees, real*4.
[in]	ALAT1	Latitude of lower left point of grid (point (1,1)).
[in]	ELON1	Longitude of lower left point of grid (point (1,1)) all real*4.
[in]	DX	Mesh length of grid in meters at tangent latitude.
[in]	ELONV	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 this is also the meridian (on the back side of the tangent cone) along which the cut is made to lay the cone flat.
[in]	ALATAN	The latitude at which the lambert cone is tangent to (touching) the spherical Earth. Set negative to indicate a southern hemisphere projection.
[out]	XI	I coordinate of the point specified by alat, elon
[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

1988-11-25

Definition at line 41 of file w3fb11.f.