Montage is a toolkit for assembling astronomical images into custom mosaics.
It uses algorithms that preserve the calibration and positional (astrometric)
fidelity of the input images to deliver mosaics that meet user-specified
parameters of projection, coordinates, and spatial scale. It supports all
projections and coordinate systems in use in astronomy.
It contains independent modules for analyzing the geometry of images on the
sky, and for creating and managing mosaics; these modules are powerful tools
in their own right and have applicability outside mosaic production, in areas
such as data validation.