g2aec.F90 File Reference

Pack/unpack a data field that was packed with AEC compression. More...

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Functions/Subroutines
subroutine	aecpack (fld, width, height, idrstmpl, cpack, lcpack)
	Pack a data field into a AEC code stream as defined in Data Representation Template 5.42.
subroutine	aecunpack (cpack, len, idrstmpl, ndpts, fld)
	Unpack a data field from a AEC code stream as defined in Data Representation Template 5.42.

Detailed Description

Pack/unpack a data field that was packed with AEC compression.

Author

Eric Engle

Date

2023-10-16

Definition in file g2aec.F90.

Function/Subroutine Documentation

aecpack()

subroutine aecpack	(	real, dimension(width*height), intent(in)	fld,
		integer, intent(in)	width,
		integer, intent(in)	height,
		integer, dimension(*), intent(inout)	idrstmpl,
		character(len=1), dimension(*), intent(out)	cpack,
		integer, intent(inout)	lcpack
	)

Pack a data field into a AEC code stream as defined in Data Representation Template 5.42.

After the data are scaled, and the reference value is subtracted out, the data are passed to the AEC encoder.

This function also fills in GRIB2 Data Representation Template 5.42 with the appropriate values.

Parameters

[in]	fld	The data values to pack.
[in]	width	number of points in the x direction
[in]	height	number of points in the y direction
[in,out]	idrstmpl	Contains the array of values for Data Representation Template Table 5.42. idrstmpl(1) Reference value - ignored on input. idrstmpl(2) Binary Scale Factor. idrstmpl(3) Decimal Scale Factor. idrstmpl(4) Number of bits containing each grayscale pixel value idrstmpl(5) Original field type, currently set = 0 on output Data values assumed to be reals. idrstmpl(6) CCSDS compression options mask. idrstmpl(7) Block size. idrstmpl(8) Reference sample interval.
[out]	cpack	The packed data field (character*1 array).
[in,out]	lcpack	When function is called, contains the length of buffer cpack. After functions returns, contains the length of the packed data in bytes.

Author

Eric Engle

Date

2023-10-16

Definition at line 36 of file g2aec.F90.

Referenced by addfield().

aecunpack()

subroutine aecunpack	(	character(len=1), dimension(len), intent(in)	cpack,
		integer, intent(in)	len,
		integer, dimension(*), intent(in)	idrstmpl,
		integer, intent(in)	ndpts,
		real, dimension(ndpts), intent(out)	fld
	)

Unpack a data field from a AEC code stream as defined in Data Representation Template 5.42.

Parameters

[in]	cpack	The packed data field (character*1 array).
[in]	len	length of packed field cpack().
[in]	idrstmpl	Array of values for Data Representation Template 5.42.
[in]	ndpts	The number of data values to unpack.
[out]	fld	Contains the unpacked data values.

Author

Eric Engle

Date

2023-10-16

Definition at line 94 of file g2aec.F90.

Referenced by getfield(), and gf_unpack7().