基于遥感技术的鄱阳湖面积库容估算

The Calculation of Area and Storage of Poyang Lake Based on Remote Sensing Technology

首先使用基于图像间逻辑运算的水体提取方法提取出鄱阳湖水体;然后将提取的水体转化为矢量格式并统计得到鄱阳湖面积;最后,将提取出的矢量水面节点处的高程值进行插值得到的水面高程图与DEM相减,得到水深图,再根据水深图和栅格大小便可得到鄱阳湖的库容。实验结果表明,本文方法可以很好地提取出鄱阳湖水体,对于鄱阳湖面积与库容的估算,估算的结果与其他学者的结果相比偏大11%左右。文中提出的利用TM影像和DEM对鄱阳湖面积和库容进行估算的方法,可作为水域动态监测的一个新思路。

In this paper,firstly we extracted water body of Poyang Lake area based on the method Logic Operation which is used to extract water body between images.Then the grid-formatted files of water coverage were converted into vector-formatted ones and the area of Poyang lake was calculated by using attributes of the vector-formatted water.Finally water depth was generated by subtracting the elevation chart of water surface,which was got from the process of interpolation using DEM value at the vertices of the vector format water and DEM chart,and estimated the storage of Poyang Lake according to the elevation chart of water surface and cell size of the chart.Experimental results showed that the logical operation between images could be used for extraction of water body of Poyang Lake area well.Estimated area and storage of Poyang Lake were approximately 11% greater than other scholar＇s results.In this paper,we put forward the methods to estimate the area and storage of Poyang Lake using TM imagery and DEM,it is a new idea for dynamic monitoring of water area.