其他摘要：The delineation of a market service area for recreational boaters using a given public access ramp is essential to answer the question of where boaters come and examine the extent to which there is variability in the geographic distribution of usc intensity within a ramp's market area. This paper presents a methodology for identifying and mapping the primary service area (PSA) of a public access ramp - the predominant market area from which ramp patrons are drawn - by taking into account directional variability and the distance- decay properties of ramp use. This involves the identification of the market boundary of the PSA; something that is known to vary by location and direction.
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