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.

中国东北地区是我国核心粮食主产区之一，对区域乃至国家粮食安全具有举足轻重的战略影响。作物类型制图是优化作物管理、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（OIFKG），生成了2017至2019年中国东北地区逐年10米分辨率的主要作物（水稻、玉米、大豆）分布制图。经地面实测数据验证，该制图的总体精度高于90%（Kappa系数大于0.90），水稻、玉米、大豆的生产者精度普遍高于0.92。该作物分布制图与市级层面的统计数据具有高度一致性。本研究构建的高精度长时序作物分布数据集可靠性极强，可为区域农业生产管理提供有力支撑。