From: Spatial distribution of non-point source nitrogen in urban area of Beijing City, China
Type | Scale | Source |
---|---|---|
Land use | 1:1 500 000 | RS image digitalizing and interpreting, Beijing municipal people's government, China |
Landform | 1:250 000 | National geomatics center of China |
Administrative division | 1:1 500 000 | Beijing municipal bureau of statistics |
Social economics | Each district | Beijing municipal bureau of statistics |
Export coefficient | Each nitrogen source | Literature, statistical data, and field monitoring |