AVHRR Geometric Mapping Routines

These routines perform all of the tasks for manipulating AVHRR geometric mapping grids. A program may access these routines by linking the following object library.

	$ADAPSLIB/geolib.a
A geometric mapping grid is an evenly spaced set of points in an output image. Each grid point has an associated value from an input image. These values are then interpolated between four grid points to determine the value for each pixel in the output image.

A LAS geometric mapping grid contains the line and sample location in the input image for each grid point. These locations are interpolated for each pixel in the output image to determine which input pixel should be placed in the output image.

The AVHRR geometric mapping grid is a generalized version of the LAS geometric mapping grid. Such grids allow up to MAXGRIDVALS values to be stored for each grid point.