The study attempts to determine if remote sensing techniques are available which would measure directly the number of individuals engaged in a specific outdoor recreation activity at a specific time. Airborne sensors received the most attention after initial study of satellite and high-altitude aircraft systems showed they offer no promise at this time for measuring recreation use. The DINADE-type system probably has more potential than any other system encountered,however,the development costs for this single purpose could be prohibitive. Efforts to improve ground-based methods such as time-lapse or activated photography could supply virtually constant monitoring,an attribute thus far not achieved. (Author)
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