Fortran 90 routines for the BYU-MERS "SIR" image format

The BYU-MERS "sir" image format was developed by the Brigham Young
University (BYU) Microwave Earth Remote Sensing (MERS) research group
to store images of the earth along with the information required to
earth-locate the image pixels.

Note that these routines use the SIR-standard pixel address from 1 to N.  
(1,1) is in the lower left of the image of a SIR File.  For an input location
of pixel (1,1) the Lat,Lon values returned by pixtolatlon correspond to 
the location of the lower-left corner of the (1,1)th pixel.

This directory contains several programs which illustrate reading and
writing BYU SIR files.  The programs include utilities to convert the
SIR files into other file formats and to compute SIR "images" of the
lat/lon of each pixel in an other SIR image.

Fortran 90-specific routines are in lib/ 

The SIREZ_90.f file contains f90 interface routines which simplify
calling of the sir fortran routines in fortran 90 code.

Illustrations of how to call the various routines are in this directory
and use the library routines.

Generally, it is recommended that header info be initialized from a 
previously read sir file and modified as necessary.

Code is SIR header version 3.0 compliant.

Last revised: 22 Aug 2019  DGL
(c) 2002, 2019 BYU MERS