High-resolution map of sugarcane cultivation in Brazil using a phenology-based method

[摘要] Sugarcane is the most important source of sugar, and itscultivation area has undergone rapid expansion, replacing other crops,pastures, and forests. Brazil is the world's largest sugarcane producer andcontributed to approximately 38.6 % of the world's total production in2019. Sugarcane in Brazil can be harvested from April to December inthe south-central area and from September to April in the northeast area. Theflexible phenology and harvest conditions of sugarcane in Brazil make itdifficult to identify the harvest area at state to country scales. In thisstudy, we developed a phenology-based method to identify the harvest area ofsugarcane in Brazil by incorporating the multiple phenology conditions intoa time-weighted dynamic time warping method (TWDTW). Then, we producedannual 30 m spatial resolution sugarcane harvest maps (2016–2019) for 14states in Brazil (over 98 % of the harvest area) based on the proposedmethod using Landsat-7, Landsat-8, and Sentinel-2 optical data. The proposed methodperformed well in identifying sugarcane harvest area with limited trainingsample data. Validations for the 2018 harvest year displayed high accuracy,with the user's, producer's, and overall accuracies of 94.35 %, 87.04 %, and91.47 % in Brazil, respectively. In addition, the identified harvest areaof sugarcane exhibited good correlations with the agricultural statisticaldata provided by the Brazilian Institute of Geography and Statistics (IBGE)at the municipality, microregion, and mesoregion levels. The 30 m Brazilsugarcane harvest maps can be obtained at https://doi.org/10.6084/m9.figshare.14213909 (Zheng et al., 2021).

[学科分类] 眼科学