Rice is one of the most important cultivation in the world. It is an essential food for more than one third of mankind, especially in tropical Asia, where persistent cloud cover hinders the acquisition of useful optical imagery from space during the most part of the year.
Spaceborne Synthetic Aperture Radar (SAR) such as the European ERS, the Japanese JERS-1, and the Canadian RADARSAT enable to monitor rice growth and to retrieve rice acreage, using the unique temporal signature of rice fields, regardless of the weather conditions.
The multitemporal SAR time series (3 images, represented below in red, green and blue color composition) presented here has been acquired over Tha�land from August to December 1993, by the ERS-1 satellite of the European Space Agency (Original images: courtesy of Dr. J. Aschbacher).
Appropriate PRIVATEERS N.V. processing (image radiometric calibration, speckle filtering and classification method) and know-how (agronomy, radar physics) enables to extract useful information such as land-use, area of rice paddies, etc., from these satellite SAR images. The resulting classification can be used to forecast the rice production, thus getting a valuable economical information, exploitable, either for agriculture management, or on the stock exchange market.
Multitemporal ERS-1 SAR image: Kanchanabury area, Tha�land: Rice fields (violet) exhibit a characteristic temporal response to the radar wave. The 3 ERS images have been filtered using the Gamma-Gamma MAP adaptive speckle filter. The imaged area covers 19.2 x 17.6 km. (© PRIVATEERS N.V. 1996).
Identification of Rice (green), Cassava (orange) Palmtrees (yellow) and Housing (brown) in Tha�land using ERS multitemporal SAR images (© PRIVATEERS N.V. 1996).
(© PRIVATEERS N.V. 1997)
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For the first time in Europe, the real-time, early in the agricultural season (winter) , acreage estimation of economically important crops (cereals, etc.) and of non-cultivated (set-aside) land in Europe has been successfully carried out under PRIVATEERS N.V. leadership and management. Operations were conducted during from November 1994 to February 1995 (Test areas in Spain, Italy, France), using ERS SAR images and a similar methodology in the framework of the ERS-1 (ESA) Pilot Project PE-FRNE.
PRIVATEERS N.V. is the conceptor and Prime Investigator of:
Application Pilot Projects for Environmental Monitoring, Agriculture Forecasting, Forest Inventory, Archaeology, and Forest Fires Prevention, in Europe, South America, Central America, and South-East Asia.
PRIVATEERS N.V. is a major consultant of important European industrials for the conception and the preparation of such projects in Europe.
Today, PRIVATEERS N.V. proposes and carries out such Early Crop Acreage Estimation operational projects outside Europe.
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