Agriculturally consistent mapping of smallholder farming systems using remote sensing and spatial modelling

Crespin-Boucaud Arthur, Lebourgeois Valentine, Lo Seen Danny, Castets Mathieu, Bégué Agnès. 2020. Agriculturally consistent mapping of smallholder farming systems using remote sensing and spatial modelling. In : Earth Observation and Continuous Monitoring of Our Changing Planet: From Sensors to Decisions. Jordan T.R. (ed.), Schuckman K (ed.). Baltimore : ISPRS, 35-42. (ISPRS Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, XLII-3/W11) William T. Pecora Memorial Remote Sensing Symposium (PECORA 21). 21, Baltimore, États-Unis, 6 Octobre 2019/11 Octobre 2019.

https://doi.org/10.5194/isprs-archives-XLII-3-W11-35-2020

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Note générale : A l'occasion de ce congrès, s'est également déroulé le 38th International Symposium on Remote Sensing of Environment (ISRSE-38)

Résumé : Smallholder agriculture provides 90 % of primary food production in developing countries. Its mapping is thus a key element for national food security. Remote sensing is widely used for crop mapping, but it is underperforming for smallholder agriculture due to several constraints like small field size, fragmented landscape, highly variable cropping practices or cloudy conditions. In this study, we developed an original approach combining remote sensing and spatial modelling to improve crop type mapping in complex agricultural landscapes. The spatial dynamics are modelled using Ocelet, a domain-specific language based on interaction graphs. The method combines high spatial resolution satellite imagery (Spot 6/7, to characterize the landscape structure through image segmentation), high revisit frequency time series (Sentinel 2, Landsat 8, to monitor the land dynamic processes), and spatiotemporal rules (STrules, to express the strategies and practices of local farmers). The method includes three steps. First, each crop type is defined by a set of general STrules from which a model-based map of crop distribution probability is obtained. Second, a preliminary crop type map is produced using satellite image processing based on a combined Random Forest (RF) and Object Based Image Analysis (OBIA) classification scheme, after which each geographical object is labelled with the class membership probabilities. Finally, the STrules are applied in the model to identify objects with classes locally incompatible with known farming constraints and strategies. The result is a map of the spatial distribution of crop type mapping errors (omission or commission) that are subsequently corrected through the joint use of spatiotemporal rules and RF class membership probabilities. Combining remote sensing and spatial modelling thus provides a viable way to better characterize and monitor complex agricultural systems.

Mots-clés Agrovoc : exploitation agricole familiale, cartographie de l'utilisation des terres, pratique culturale, paysage agricole, modélisation des cultures, imagerie par satellite

Mots-clés géographiques Agrovoc : Madagascar

Mots-clés libres : Landscape, Crop type mapping, Cropping practices, Sentinel-2, Spatio-temporal modelling, Smallholder agriculture

Classification Agris : F08 - Systèmes et modes de culture
U30 - Méthodes de recherche

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