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Real-time sugarcane harvest monitoring using SPOT 4 and 5 satellite data

Bappel E., Bégué A., Degenne P., Lebourgeois V., Siegmund B.. 2005. In : Ed. Hogarth. Proceedings of the XXV ISSCT Congress, 30 January - 4 February 2005, Guatemala. Guatemala : ATAGUA, 4 p.. ISSCT Congress. 25, 2005-01-30/2005-02-04, Guatemala (Guatemala).

In the context of the SUCRETTE project, (Système de sUivi de la Canne à sucRE par TélédéTEction) the Centre International de Recherche Agronomique pour le Développement (CIRAD) has set up a sugarcane harvest monitoring program using satellite data on Reunion Island. The methodology was based on the study of the time series SPOT 4 & 5 reflectance images during the 2003 harvest season from June to December. By analysing SPOT 4 & 5 satellites images, harvested fields and standing cane were easily identified. A multi spectral classification of the scene was used to produce a harvest map. It was possible to generate a sugarcane harvest map and statistics ten days after image acquisition. The methodology allowed for the determination of the harvest advance rate during the six months of the harvesting campaign. In the study this was obtained by producing sugarcane harvest maps at four times (03/07/21, 03/08/21, 03/10/14 and 03/11/20). The overall classification accuracy of the harvested fields reached 98.8% using 82 ground control fields. The harvest advance rate estimated by remote sensing was close to the mill observation, with a maximum error of 8%. Furthermore, the mill records and the harvested area can be used to estimate sugarcane yield. These results indicated that remote sensing technology could be adapted to monitor harvest schedules in real-time, using SPOT 4 & 5 data. Information extracted from satellite images could be a decision support tool for mill opening and closing dates as well as for crushing rates, which could have a significant economic impact.

Mots-clés : canne à sucre

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