Aerial color infrared photography: Applications in citriculture

摘要

The photographic specifications and operational parameters in this handbook were determined in a large aerial color infrared (ACIR) photographic experiment and in a follow-up demonstration with the cooperation of Florida citrus growers and aerial photographers. The ACIR photography in the spring gave the best separation between healthy and diseased trees. The best scale for photointerpretation with the use of inexpensive analysis equipment was 1 in. = 333 ft. Photographs taken with a 12 in. focal length lens were far superior to those taken with a 6 in. focal length lens. A cell unit grid system, with window overlays for rapid photointerpretation and a black and white enlargement for ground verification, was developed for tree registration. Use of the enlargement in ground surveys reduced the survey time from 25 hours to 2.5 hours. The cell unit grid system is compatible with computer processing for rapid recording of photo interpreted data, storage, retrieval, and analysis. A mapping system with 99 percent accuracy was developed for fast surveillance of tree vigor and stress.