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compack.c(3) Library Functions Manual compack.c(3)

NAME

compack.c - Pack a data field using a complex packing algorithm.

SYNOPSIS

#include 'grib2_int.h'
#include <math.h>
#include <stdlib.h>

Functions


void compack (float *fld, g2int ndpts, g2int idrsnum, g2int *idrstmpl, unsigned char *cpack, g2int *lcpack)
Pack a data field using a complex packing algorithm.

Detailed Description

Pack a data field using a complex packing algorithm.

Author

Stephen Gilbert

Date

2002-11-07

Definition in file compack.c.

Function Documentation

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

Pack a data field using a complex packing algorithm. This function 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 Template 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. 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)

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

Author

Stephen Gilbert

Date

2002-11-07

Definition at line 42 of file compack.c.

References ALOG2, int_power(), mkieee(), pack_gp(), sbit(), and sbits().

Referenced by cmplxpack().

Author

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