1. A method of remotely identifying material of which a physical target is made, comprising: delineating with a specially programmed computer in each at least two images taken by one or more sensors the same physical target, each of the images containing spectral radiance information for the physical target in at least one band and being acquired using a known imaging modality from a known acquisition angle, and at least two of the at least two images being acquired from two different acquisition angles within each of the at least two images the target; determining, using the specially programmed computer, an estimated target spectral signature for the target within each of the at least two images based at least in part on the radiance of the target in each of the images; determining, with the specially programmed computer, for each of the at least two acquisition angles, a predicted candidate spectral signature for a preselected candidate material based at least in part on the acquisition angle; and deciding with the specially programmed computer, based on a predetermined probability threshold, whether the candidate material and the target material match by comparing the estimated target signature and the predicted candidate signature.