By using remote sensing image processing software ERDAS IMAGINE 9.2 and GIS technology, the underlying surfaces of QuickBird image were classified to count annual pollution load from rainfall runoff in lake Dianchi Basin. Results of total rainfall in 2008 showed that the area ratios of roofs, courtyards, roads, green space and other types of cities and towns within Dianchi Basin were 13.8%, 11.6%, 5.2%, 3.8% and 65.6%. The COD, TN, TP pollution loads from urban rainfall runoff of the year 2008 in lake Dianchi Basin were 2.95104 t, 1.24103 t, 103 t respectively. Those pollution loads of northern shore of lake Dianchi in Kunming urban areas were 2.39104 t, 9.89103 t, 8.24103 t, which contributes to 81.2% COD, 79.5% TN, 80.3% TP of lake Dianchi Basin. |