黄河口大汶流自然保护区现状遥感调查试验研究

The Tentative Study on the Status Quo of the Dawenliu Nature Reserve at the Yellow River Bayou Using the Remotely Sensed Image

黄河口大汶流自然保护区是国家级自然保护区 ,位于黄河现行河道的两岸 ,是我国成陆最新、变化最快的自然保护区之一 ,是多种珍禽的栖息地 ,是研究盐生植被演化的天然实验场 ,因而快速准确地查清大汶流自然保护区土地利用状况就变得十分有意义。基于自行发展的逻辑斯蒂光谱混合分解程序 ,利用 1 999年 6月 2 5日获取的陆地卫星 TM遥感图像对大汶流自然保护区的土地利用现状进行了调查 ,结果获得了自然保护区 8类主要地表覆盖类的面积 ,与 1 997年已知空间数据相比 ,土地利用状况发生了较大变化。

The Dawenliu nature reserve is one of national nature reserve, located at the bank of the Yellow River, which is the newest land and changes most quickly. It is the habitat of many kinds of the rare birds and the natural experiment field to study the evolution of the salt vegetation. So it is important to investigate its land use status quickly and exactly. On the base of the Logistic spectral unmixing program which was developed by us, the land use status quo of the Dawenliu nature reserve is surveyed using the Landsat TM image and field GPS data. Firstly in order to reduce the interferential factors, we cut the registered TM image by the registered vector data of the border of the Dawenliu nature reserve in 1997. Because TM band six has low spatial resolution, it's not used. Secondly the atmospheric calibration of the subset image is done by the Internal Average Relative Reflection in order to reduce the path radiation and partial terrain effects. Thirdly seventy\|two training endmembers of eight surface cover types are selected. Fourthly the image is spectrally unmixed by the logistic model. As the result, the abundance images of the endmembers constituting the area of a pixel are gotten, and the classification image is given, and the areas of the eight types of the surfaces are obtained. Compared with the spatial data in 1997, the land use status quo changes remarkably. Finally make the conclusions and discussions.