子像元定位方法在湖泊水质制图中的应用研究

Application of Sub-pixel Mapping in Water Quality Mapping for Lakes

子像元定位技术是一种提高图像详度和分辨率的简单、高效的方法,近年来已成为遥感领域研究的一个热点。该方法已经在许多方面得到了应用,但目前将子像元定位技术应用于湖泊水质制图在国内外鲜有报道。本文基于Landsat-7ETM+数据对太湖的叶绿素a(Chl-a)浓度进行试验,结果表明在水质监测中应用子像元定位技术可以获得超过遥感影像自身分辨率的叶绿素a浓度分布图,更好地反映了其空间分布的细节,说明子像元定位技术在提高湖泊水质监测的精度方面具有一定的潜力。

Sub-pixel mapping is a simple and efficient technique for enhancing the spatial resolution of images. In recent years, sub-pixel mapping became a hot research spot in remote sensing. It has been applied in land cover mapping practically. However, it was rarely studied for application in mapping＇of water quality. Its principle was introduced firstly, and then the accuracy and feasibility was tested in Taihu Lake, China based on Landsat-7 ETM＋ image. The results expressed that this technique was effective in solving the mixed-pixel problem of mapping of water quality.