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In calculation of t he t heoretica l scatterin g coeffici ent for a te rrai n, previous aut hors tentatively assumed t hc normali zed a utocovariance func t ion p(r ) =eA , 2 fo r the ground elevation as a fun ction of distance from a given point. Recently a utoco rrelation st ud ies were madc using map with co nto urs ranging from one to t wcnty-fiv c feet. These I'rsul ted in curves of p (I'), which are a pproximated b~' exp (-lrIIB ). The t hco retical scatte rill g cross sect ion (uo) of ma ny such terra ins can be ex presscd as

Theoretical scattering coefficient for near vertical incidence from contour maps