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The monitoring of crop performance and the accurate and timely prediction of crop yields over extended regions require repetitive high quality information on the state of the crops as well as the occurrence, duration and impact of stress conditions. Stress conditions may, for example, be due to temporary water shortage, water logging, excessive heat, frost, or pests and diseases. Relevant information may either be retrieved through direct observations or through modelling crop growth. Direct observations may be obtained from remote measurements using aircraft or satellite platforms. Relevant sensors need to cover large regions with a high repetition rate and to measure radiation intensities relevant for the retrieval of adequate parameters. Currently, the only operational sensor which meets these requirements is the Advanced Very High Resolution Radiometer (AVHRR) flown on the NOAA series of meterological satellites. The aim of this paper is to highlight the most important characteristics of the AVHRR sensor and to discuss the retrievable parameters and their potential use for crop state monitoring. There is a short overview over the most important characteristics of the sensor, a discussion of some relevant parameters to be retrieved, and the most important sensor and satellite inherent limitations are highlighted.

Additional information

Authors: VOGT V J, JRC Ispra (IT)
Bibliographic Reference: Paper presented: Agrometerological Models : Theory and Applications CEC-JRC Agricultural Series, Ispra (IT), November 21-25, 1995
Availability: Available from (1) as Paper EN 39476 ORA
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