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EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TOPOGRAPHIC EFFECTS
Definition:
The topographic effect is indicated on Landsat images of rugged terrain by
the visual impression of relief. It is caused by the variation in
spectral radiance due to surface slope and aspect variations. The
difference in radiance between a horizontal and sloping surface of the
same cover type provides a measure of the topographic effect (Holben and
Justice 1981). Holben and Justice (1979) also measured it and showed that
the effect is most extreme in areas of rugged terrain and especially for
slopes in the principal plane of the sun and at low solar
elevations.
Reference:
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