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 structure; 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 said each component of the hierarchical image representation structure, a similarity metric between the set of radiometric descriptors for said each component and the set of radiometric descriptors of the reference multispectral image, wherein the determined similarity metric for said each component indicates a degree to which the pixels of said each component identify the at least one land use or land type of the reference multispectral image.