1. A method for use in classifying areas of interest in overhead imagery, comprising: organizing, using a processor, a plurality of pixels of at least one input multispectral image of a geographic area into a plurality of components of a hierarchical image representation; deriving, using the processor, at least one set of radiometric descriptors for each component of the plurality of components; obtaining at least one set of radiometric descriptors for a reference multispectral image, wherein pixels of the reference multispectral image identify at least one land use or land type; determining, using the processor, for each component of the hierarchical image representation structure, a similarity metric between the set of radiometric image descriptors for the component and the set of radiometric image descriptors of the reference multispectral image, wherein the determined similarity metrics indicate a degree to which the pixels of each component identify the at least one land use or land type of the reference multispectral image.