This data includes a dynamic dataset of cultivated land distribution with a resolution of 30 meters in the Heilongjiang River Basin (spanning China, Mongolia, and Russia) in 1990, reflecting the distribution of cultivated land in the Heilongjiang River Basin and providing data support for land protection, soil restoration, land planning, and other aspects. Data source（ http://www.geodata.cn/data/datadetails.html?dataguid=140218310437680 ）
中心点纬度：50.038704
中心点经度：0.25092116
最大缩放级别：8
最小缩放级别：-1
Current zoom level：3