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THE AERIAL PHOTOS
MAPPING HARDWOOD DEFOLIATION
ASSESSMENT OF TREATMENT EFFECTIVENESS
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aerial photographs aerial photos taken aerial sketch mapping altitude panoramic aerial Areas of defoliation Areas Treated base map boundaries bright red brown or red central Pennsylvania CIR film color film color infrared complete defoliation conifer stands control of gypsy dead trees defoliated areas defoliating insects Defoliation appearing defoliation Figure defoliation mapping defoliation of hardwood Eastern white pine equal area grid fiducial marks flight line forest damage Forest Pest forest tent caterpillar format green ground data Ground Plots gypsy moth defoliation heavy defoliation herbicide high altitude panoramic insect defoliation insecticide light table lighter in color location of defoliated MAP TRANSFER Mapping defoliation MAPPING HARDWOOD DEFOLIATION MONOSCOPIC overexposed panoramic aerial photos Pennsylvania photo frame number population density principal point red spruce resemble defoliation spray block stereoscope survey area target insect treated area treated for control treatment area tree mortality types of forest USDA Forest Service violet color visible defoliation Yellow zoom transfer scope