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compack.c(3) NCEPLIBS-g2c compack.c(3)

NAME

compack.c - Pack up a data field using a complex packing algorithm as defined in the GRIB2 documention.

SYNOPSIS

#include <stdlib.h>
#include <math.h>
#include 'grib2.h'

Functions


void compack (g2float *fld, g2int ndpts, g2int idrsnum, g2int *idrstmpl, unsigned char *cpack, g2int *lcpack)
This subroutine packs up a data field using a complex packing algorithm as defined in the GRIB2 documention.

Detailed Description

Pack up a data field using a complex packing algorithm as defined in the GRIB2 documention.

Author

Stephen Gilbert

Date

2002-11-07

Definition in file compack.c.

Function Documentation

void compack (g2float * fld, g2int ndpts, g2int idrsnum, g2int * idrstmpl, unsigned char * cpack, g2int * lcpack)

This subroutine packs up a data field using a complex packing algorithm as defined in the GRIB2 documention. It supports GRIB2 complex packing templates with or without spatial differences (i.e. DRTs 5.2 and 5.3). It also fills in GRIB2 Data Representation Template 5.2 or 5.3 with the appropriate values.

Parameters

fld Contains the data values to pack
ndpts The number of data values in array fld
idrsnum Data Representation Template number 5.N Must equal 2 or 3.
idrstmpl Contains the array of values for Data Representation Template 5.2 or 5.3.
  • 0 Reference value - ignored on input, set my compack().
  • 1 Binary Scale Factor
  • 2 Decimal Scale Factor
  • 6 Missing value management
  • 7 Primary missing value
  • 8 Secondary missing value
  • 16 Order of Spatial Differencing ( 1 or 2 )

Parameters

cpack The packed data field
lcpack length of packed field cpack.

Author

Stephen Gilbert

Date

2002-11-07

Definition at line 39 of file compack.c.

References int_power(), mkieee(), pack_gp(), sbit(), and sbits().

Referenced by cmplxpack().

Author

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Tue May 3 2022 Version 1.6.4