C code routines for the BYU-MERS "SIR" image file 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 C-standard pixel address from 0 to N-1
rather than the SIR-standard pixel address from 1 to N.  Note, however, that
(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 code to read/write standard SIR file format files
and to compute the map projection transformations used.  These routines
use the includes in ../include/  Be sure to edit ../include/sir3.h to
set byte order prior to compiling these routines.

Files:

  sir_io.c    : read/write routines
  sir_geom.c  : geometry routines (single precision)
  dsir_geom.c : geometry routines (double precision)
  sir_ez.c    : simplified interface to sir_io and sir_geom (single precision)
  dsir_ez.c   : simplified interface to sir_io and sir_geom (double precision)


Last revised:  12 Oct 2022  DGL
(c) 1999, 2000, 2002, 2014, 2019, 2022 BYU MERS