Remote spectral detection using a laboratory signature

Two new algorithms are derived for remotely detecting a material characterized only by its laboratory spectrum. The methods are motivated by the practical difficulties in predicting an accurate field radiance from a reflectance. The first algorithm associates an affine subspace with the material, instead of a radiance point. The second algorithm is designed to prevent false alarms from dark pixels, to which the first algorithm may be sensitive. Both algorithms are ideally suited for use in conjunction with a simple method of vicarious calibration, which is also described.