Abstract
Optimum result by using aerial photography for snow survey can be assured through the selection of equipment and materials and the choice of flight planning.The main factors that must be considered are following : Type of filmSpeed of filmFilter factorFlight altitudeTemperature at working altitudeContrast ratio or brightness range of subjectThe application of infra-red photography or color photography may sometimes bring more effective achievements for special purposes.Especially, infra-red photography has recently made considerable advance and become utilized more and more for snow-survey.
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