chapter  4
20 Pages

Subpixel Analysis of Urban Landscapes

Urban landscapes are typically composed of features that are smaller than the spatial resolution of sensors — a complex combination of buildings, roads, grass, trees, soil, water, and so on. Strahler et al. (1986) defined H-and L-resolution scene models based on the relationship between size of the scene elements and the resolution cell of the sensor. The scene elements in the L-resolution model are smaller than the resolution cells, and are not detectable. When the objects in the scene become increasingly smaller than the resolution cell size, they may no longer be regarded as objects individually. Hence, the reflectance measured by the sensor may be treated as a sum of interactions among various classes of scene elements as weighted by their relative proportions (Strahler et al., 1986).