Record Display for the EPA National Library Catalog


Main Title Feasibility of Using Color Aerial Photography to Detect and Evaluate Sulphur Dioxide Injury to Timber Stands.
Author Zeale, Kristina A. ; Helle, Robert C. ; Noric, Nancy X. ; Wilke, Marilyn ;
CORP Author Pacific Southwest Forest and Range Experiment Station, Berkeley, Calif.
Year Published 1971
Report Number 0865;
Stock Number PB-205 279
Additional Subjects ( Air pollution ; Sulfur dioxide) ; ( Infrared photography ; Plant diseases) ; ( Sulfur dioxide ; Plant diseases) ; Color photography ; Trees(Plants) ; Forest land ; Airborne detectors ; Photointerpretation ; Feasibility ; Alabama ; Air pollution effects(Plants)
Library Call Number Additional Info Location Last
NTIS  PB-205 279 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 160p
A feasibility study was undertaken in Alabama near a point source of sulphur dioxide, emissions to determine the best film-filter-scale combination of aerial photography to evaluate SO2 injury to forest vegetation. Normal color film, exposed through a didymium filter, at very large scales (1:800 and 1:1,584) proved to be the most accurate sensor. Color infrared film was almost as good. Interpreter differences were least at large scale and on color film. Ground variables which were best correlated with photo interpretation were: crown color, needle color, Munsell hue, percent of current needles with tip dieback and the length of the tip dieback. A combination of photo and ground plots appears to be the most efficient design for measuring these effects--especially if done over large areas.