readme 2/00, updated 3/2001

Portable versions of Reanalysis software

pgb:
	function: converts sigma spectral files to pressure level grib 
		  files (pgb)

	use: works on Reanalysis-2 files
	     works on Reanalysis-1 files (if converted to f77, IEEE)
	     works on current operationsl sigma files (slightly
		different results from different filtering etc)

	     can be modified to give more vertical levels and higher
		precision GRIB files

	tested: linux, hp, sgi, aix


stream:
	function takes pgb file (pressure level data) and calculates
		stream function, velocity potential, relative vorticity
		and divergence.  This program does the calculation
		using spectral transforms and uses the same algorithm
		used in making the monthly STRM and VPOT fields.

	use: works on Reanalysis-2 files
	     works on Reanalysis-1 files
	     array sizes are hardwired to the T62 model
	requires grbindex	

igb:
	function: makes isentropic analyses from spectral sigma files
	includes software to convert CRAY sigma files to f77 IEEE

	tested: linux, AIX

sgb:
	function: makes gridded analyses on sigma surfaces from
	from spectral sigma files
	3/29/01 fix grib GDS
	1/8/04  revised Readme file
	tested: linux (7.1), AIX
        5/20/2008: updated to current version (gaussian grid)
        10/2016: updated sgb.sh, makefile

conversion utilities: CRAY spectral -> f77 IEEE spectral
	see igb.tgz

grib_rh:  AIX program to compute specific humidity from relative
        humidity.  Not recently tested on linux. 


swap.c:  simple program to convert the big-endian ieee sigma files
       to litte-endian  ieee sigma files that can be read on
       the linux boxes.
       10/2016: added #include <stdlib.h> to remove compile message

grbindex.tgz: Creates grib1 index files as used by stream.
       added 6/2014 and was tested under linux using gfortran, gcc

be nice to distribute the model, SSI and QC programs but that would 
require a lot of work.

----------------------------------------------------

Comment:

   I wanted to make the packages portable without spending much time.
Therefore I decreed that any program that ran under linux & g77/gcc was 
portable.  If you aren't running on a linux box, g77/gcc has probably
been ported to your machine.  Even if you can't find g77/gcc, you can
probably make the code run with a f90 compiler or a better f77 compiler.
Oh yes, when porting code - questions should be directed to a local expert.