Image Analysis, Classification and Change Detection in Remote Sensing, 3rd Edition

404 Change Detection

properties at the time of image acquisition. For most historical satellite scenes

such data are not available and even for planned acquisitions they may be diffi-

cult to obtain. A relative norma lization based on the radiometric information

intrinsic to the images themselves is an alternative whenever absolute sur face

reflectances are not required.

In perfor ming relative r adiometric normalization, one usually makes the

assumption that the relationship between the at-sensor radiances recorded at

two different times from regions of constant refle ctance can be approximated

by linear functions. The critical aspect is the determination ...