Help for DERIV

PURPOSE
    A vicar application program to provide the first derivative of an
image.

OPERATION

This program takes an input data set and converts it to its first derivative
in either the Horizontal (sample) orientation or the Vertical (line) orientation.
The second output is the inflection map, where 0 is no inflection, +1 is inflection
going from pos to negative and -1 is inflection going from negative to postive.

The parmeter orient gives the orientation of the derivative.

The return parameters give the number of positive and negative inflection points
in the map

RESTRICTIONS

    1) This program does not preserve Map Projection label geometry.
    2) This program does not work on multiband images

PROGRAM HISTORY:

Written by: Ray Bambery, 13 November 2010
Cognizant programmer: Ray Bambery
Revision history:

  2010-11-13 R. J. Bambery - initial release
  2010-12-05 R. J. Bambery - add inflection map
  2011-05-02 R. J. Bambery - fix warning messages from gcc 4.4 compiler
  2015-11-19 W. L. Bunch - Migrated to MIPL
  2022-07-26 B. Crocco afids to opensource

PARAMETERS: