N'Doume Claude, Lachenaud Philippe, Hussard Alain, Nguyen Hugo, Flori Albert.
2000. A feasibility study for the implementation of statistical inventory mapping of coffee and cocoa plantations in Côte d'Ivoire by satellite remote sensing.
In : XIXe Congrès de la Société internationale de photogrammétrie et de télédétection. ISPRS
Autre titre : Etude de faisabilité pour l'élaboration d'une cartographie statistique d'inventaire des vergers café et cacao en Côte d'Ivoire par télédétection satellitale
Résumé : This study, carried out in the Daloa region (Middle-west of Côte d'lvoire), aims at implementing a statistical inventory mapping of coffee and cacao plantations in Côte d'Ivoire by satellite remote sensing. The methodology used resides in classifying a multi-band SPOT image by the "maximum likelihood" method. The first step consisted in an in-depth survey (36 variables, including 19 agronomic ones) carried out on 358 plots in a pilot zone of about 30.000 ha already ground-delimited by Plan Foncier Rural (PFR). Data multivariate analysis revealed that, for both crops, yield estimated by investigators was summing up the key variables describing plantations (shade, condition, maintenance, etc... ). This parameter was thus used to create test-plots samples (coffee and cocoa). The "yield-spatial delimitation of the plots" approach proved to give the best classification results controlled over all studied plots. The test-zone classified image, cartographied with a 1 ha unit is shown. Global mapping precision (Pixels Correctly Classified) is 72 % : 69 % for coffee and 66 % for cacao. In a second phase, the methodology was applied to the entire SPOT scene (360,000 ha) and a validation survey was implemented. Global mapping precision is then 80% and reconnaissance rates for coffee and cocoa are 86 and 94%, respectively. Estimated areas might be more reliable than previous estimations resulting from land or farming investigations used so far. It is worth noting that these results were obtained through reduced test-plots samples (in number-about ten per theme- and in area), hence with low costs and duration in operational phase.
Mots-clés Agrovoc : Theobroma cacao, Coffea, plantations, enquête sur les exploitations agricoles, biométrie, cartographie, relevé (des données), télédétection, méthode statistique, facteur lié au site
Mots-clés géographiques Agrovoc : Côte d'Ivoire
Classification Agris : U30 - Méthodes de recherche
F01 - Culture des plantes
P31 - Levés et cartographie des sols
Auteurs et affiliations
- N'Doume Claude, Centre de cartographie de télédétection (CIV)
- Lachenaud Philippe, CIRAD-CP-CACAO (CIV)
- Hussard Alain, Centre de cartographie de télédétection (CIV)
- Nguyen Hugo, CIRAD-CP-PALMIER (FRA)
- Flori Albert, CIRAD-CP-PALMIER (FRA)
Autres liens de la publication
Source : Cirad - Agritrop (https://agritrop.cirad.fr/475315/)
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