Large Area Crop Inventory Experiment (LACIE). Detecting and Monitoring Agricultural Vegetative Water Stress Over Large Areas Using LANDSAT Digital Data (LACIE-00506)

摘要

The author has identified the following significant results. The Green Number Index technique which uses LANDSAT digital data from 5x6 nautical mile sampling frames was expanded to evaluate its usefulness in detecting and monitoring vegetative water stress over the Great Plains. At known growth stages for wheat, segments were classified as drought or nondrought. Good agreement was found between the 18-day remotely sensed data and a weekly ground-based crop moisture index. Operational monitoring of the 1977 USSR and Australian wheat crops indicated drought conditions. Drought isoline maps produced by the Green Number Index technique were in good agreement with conventional sources.