gtbits.f File Reference

The number of bits required to pack a given field. More...

Go to the source code of this file.

Functions/Subroutines
subroutine	gtbits (ibm, ids, len, mg, g, ground, gmin, gmax, nbit)
	The number of bits required to pack a given field at a particular decimal scaling is computed using the field range.

Detailed Description

The number of bits required to pack a given field.

Author

Mark Iredell

Date

1992-10-31

Definition in file gtbits.f.

Function/Subroutine Documentation

gtbits()

subroutine gtbits	(		ibm,
			ids,
			len,
		dimension(len)	mg,
		dimension(len)	g,
		dimension(len)	ground,
			gmin,
			gmax,
			nbit
	)

The number of bits required to pack a given field at a particular decimal scaling is computed using the field range.

The field is rounded off to the decimal scaling for packing. The minimum and maximum rounded field values are also returned. Grib bitmap masking for valid data is optionally used.

Program history log:

• Mark Iredell 1992-10-31

Parameters

[in]	ibm	integer bitmap flag (=0 for no bitmap).
[in]	ids	integer decimal scaling (e.g. ids=3 to round field to nearest milli-value).
[in]	len	integer length of the field and bitmap.
[in]	mg	integer (len) bitmap if ibm=1 (0 to skip, 1 to keep).
[in]	g	real (len) field.
[out]	ground	real (len) field rounded to decimal scaling (set to zero where bitmap is 0 if ibm=1).
[out]	gmin	real minimum valid rounded field value.
[out]	gmax	real maximum valid rounded field value.
[out]	nbit	integer number of bits to pack.

Author

Mark Iredell

Date

1992-10-31

Definition at line 27 of file gtbits.f.