A Disk Camera System for Automatic Recording of Visual Data: Snow Depth in Field Plots

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Abstract
A disk camera triggered by a timed signal provided an inexpensive method of obtaining visual data at a remote site. We used the method successfully to record snow depth and duration in experimental plots during the winters of 1984-1985-1986. The system can be adapted to accommodate any exposure interval greater than 1 sec, with the time between site visits limited by the number of exposures (15) available per film disk. [Gremmeniella abietina on Pinus resinosa was studied in Wisconsin.].

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