Level 2 Help for PIXGRAD

INP

Filename of the input elevation dataset.


OUT

Filenames of the output datasets. The first dataset will contain the 
gradient magnitude (aka dip, or slope) image.  The second dataset will 
contain the gradient azimuth (aka slope azimuth, or slope direction) image.


SIZE

             Vicar size field.
             -----------------
             Starting line          default - input image
             Starting sample
             Number of lines
             Number of samples


NORTH

Direction of North in degrees clockwise from top of image.
             Default = 0.0


ADIP

             Scale factor for slope.

             DN(DIP) = (ADIP * DIP) + BDIP
             where
             adip - scale factor
             dip  - computed dip in degrees
             bdip - offset factor

             Default ADIP = 255./90.
                     BDIP = 0.0


BDIP

             Offset factor for slope.

             DN(DIP) = (ADIP * DIP) + BDIP
             where
             adip - scale factor
             dip  - computed dip in degrees
             bdip - offset factor

             Default ADIP = 255./90.
                     BDIP = 0.0


AAZ

             Scale factor for azimuth.
 
             DN(AZIM) = (AAZ * AZIMUTH) + BAZ
             where
             aaz      - scale factor 
             azimuth  - computed azimuth in degrees from North
             baz      - offset factor

             Default AAZ = 256./360.
                     BAZ = 0.0


BAZ

             Offset factor for azimuth.

             DN(AZIM) = (AAZ * AZIMUTH) + BAZ
             where
             aaz      - scale factor 
             azimuth  - computed azimuth in degrees from North
             baz      - offset factor

             Default AAZ = 256./360.
                     BAZ = 0.0


LSCALE

             Line scale in meters per line.

             Default = 1.0


SSCALE

             Sample scale in meters per sample.

             Default = 1.0


AALT

             Altitude scale in meters per dn of input.

             Default = 1.0 meter/dn
2  HISTORY

  Made Portable for UNIX  RNR(CRI)  05-SEP-94
  Changed default values and modified I/O REA 08-NOV-94