This application applies a geometric *warp* to an image using a user
supplied Control Network. The Control Network consists of the input
(FROM) cube and a second cube for which image-to-image Control Points
are measured. Programs, such as coreg, can be used to generate the
Control Network file for level1 or level2 cubes.

The Control Measures of the FROM cube are fit to the corresponding Control Measures of the second cube in the Control Network file using a weighted or non-weighted least squares fit to a polynomial of degree N, where N is specified by the DEGREE parameter.

With weighted least squares fit, specific pixel movement (input to output location) is based on Control Point distances from a given pixel. That is, Control Points closest to a given input pixel will have greater weight (influence) on the computed output location than Control Points furthest from the input pixel. With non-weighted least squares fit, all Control Points will have equal weight toward influencing individual pixel movement.