The spatial distribution of basic geographic data in the Heilongjiang River Basin, including the distribution of national borders, administrative regions, roads, railways, and rivers; Space coordinate system: WGS 84
中心点纬度 ：48.505947
中心点经度 ：124.325
最大缩放级别 ：10
最小缩放级别 ：1
Current zoom level ：5