Level 2 Help for CONFILL2

 input data set

 the output image, filled by a 2-dimensional interpolation of contour lines.

 CONFILL2 expects all background pixels to be of a single DN value, specified
 by this parameter (Default value is 0).  All pixels with different values
 are assumed to be part of a contour line.

 Two interpolation modes are currently available in CONFILL: linear and cubic
 spline.  Extrapolation, when needed, is done by extension of the outermost
 contour. The valid keywords are: LINEAR, and SPLINE. SPLINE is the default.