Abstract The Tentative Study on the Status Quo of the Dawenliu Nature Reserveat the Yellow River Bayou Using the Remotely Sensed ImageLIU Qing-sheng, LIU Gao-huan, YE Qing-hua(State Key Laboratory of Resources and Environmental Information System,The ChineseAcademy of Science,Beijing100101,China)CHANG Jun(Population,Resource and Environment Academy,Shandong Normal University,Jinan, 250014China)Abstract:The Dawenliu nature reserve is one of national nature reserve, located at the bank of the YellowRiver, which is the newest land and changes most quickly. It is the habitat of many kinds of the rare birdsand the natural experiment field to study the evolution of the salt vegetation. So it is important to investi-gate its land use status quickly and exactly. On the base of the Logistic spectral unmixing program whichwas developed by us, the land use status quo of the Dawenliu nature reserve is surveyed using the LandsatTM image and field GPS data. Firstly in order to reduce the interferential factors, we cut the registeredTM image by the registered vector data of the border of the Dawenliu nature reserve in 1997. Because TMband six has low spatial resolution, it' s not used. Secondly the atmospheric calibration of the subset imageis done by the Internal Average Relative Reflection in order to reduce the path radiation and partial terraineffects. Thirdly seventy-two training endmembers of eight surface cover types are selected. Fourthly theimage is spectrally unmixed by the logistic model. As the result, the abundance images of the endmembersconstituting the area of a pixel are gotten, and the classification image is given, and the areas of the eighttypes of the surfaces are obtained. Compared with the spatial data in 1997, the land use status quo changesremarkably. Finally make the conclusions and discussions.Key words:Dawenliu nature reserve, land use status, spectral unmixing
|