应用谷歌地球软件录入实际勘察的洪水流向变化关键点的GPS数据,结合实际水位数据和水流传播时间绘制出了“7·21”大清河北支洪水入淀的水流水势示意图,并根据谷歌地球软件的历史数据分析出了洪水水量—水位—水面变化的实际对比关系。 Using Google Earth software to input the GPS data of the key points of the actual investigation of the flood flow direction change, the actual water level data and the time of the water flow are used to draw the water flow potential diagram of the " The history of the Earth’s software analyzes the actual correlation between flood volume, water level and surface water changes.