Mapping crop type in Northeast China during 2017-2023 (Including code for classification)

Northeast China is one of the most major grain production regions in China and has an overwhelming influence on regional and national food security. Crop type mapping is important for crop managements to maximize crop yield. We produced annual 10-m major crops (rice, maize and soybean) maps in Northeast China from 2017 to 2019, using a practical and transferable crop mapping approach by constructing crop-specific OIF knowledge graph (OIFKG). The overall accuracies higher than 90% (Kappa coefficient greater than 0.90), and the producer’s accuracies for rice, maize, and soybean are generally greater than 0.92 based on ground truth data. The crop maps have close agreement with the statistical data at the municipal level. This study provides a highly reliable long-term crop maps dataset, which can be helpful for regional agricultural production management.

中国东北地区是中国最核心的粮食主产区之一，对区域及国家粮食安全具有至关重要的影响。作物类型制图是实现作物精细化管理、最大化作物产量的关键环节。本研究采用一种实用且可迁移的作物制图方法，通过构建作物专属OIF知识图谱（OIF Knowledge Graph，OIFKG），生成了2017至2019年中国东北地区10米分辨率的水稻、玉米、大豆三类主要作物的年度分布图谱。经地面真值数据验证，该数据集总体精度高于90%（卡帕系数大于0.90），水稻、玉米、大豆的生产者精度普遍高于0.92。该作物分布图与市级层面的统计数据具有高度一致性。本研究提供了一套可靠性极高的长期作物图谱数据集，可为区域农业生产管理提供有力支撑。