基于IRS-P6遥感影像的高原区土地利用动态变化监测

目的]对青海省天峻县重点区域2005—2014年的土地利用变化情况进行监测,为生态环境保护和土地利用政策制定提供依据。方法]利用2005—2014两期IRS-P6卫星影像数据,研究了针对该区域土地利用变化遥感监测的技术方法和操作流程。实践表明,该方法用于对土地利用变化的监测与制图能够有效地提高土地利用信息提取的精度和效率。结果]2009年,土地利用仍以草地为主,虽比2005年略微减少,但基本保持平衡;内陆滩涂和未利用地总面积则略微增加,面积占比最小的依然是建设用地,虽然年均增长速度较快,但占比仅为0.29%。从年均变化上看,10a间,水域面积减少近66.2%,年均减少速度达到了6.62%;建设用地增长过快,10a间增长了59.98%,年均增长达到了6.00%。结论]当地经济在这10a间有了较快的发展,城镇化水平得到一定程度的提高,但占总面积比例不足。监测区土地利用总体变化不大,年均变化率仅为0.13%。

Land-use Dynamic Changes in Plateau Area Based on Image of IRS-P6 Satellite

Objective] The land-use change during 2005-2014 was monitored in order to provide the scientific data for the policy making and ecological environment protection in Tianjun County of Qinghai Province.Methods] Based on the IRS-P6 satellite image of 2005 and 2014,the technical methods and operation process of remote sensing monitoring for the land-use change in the key region of Tianjun county was studied.Results] In 2009,the dominated land use type was grass,which was slightly less than that in 2005.The area of mud flat and unused land was slightly increased.The area of the construction land was still smallest because the area proportion was only as low as 0.29 ％,although its annual growth rate was increasing rapidly.Regarding to the annual changes,the water area decreased by almost 66.2％ in the past ten years and the annual decreasing rate was 6.62％.The area of construction land increased fast and reached 59.98％ in the past 10 years and the annual increasing rate was 6.00％.Conclusion] Local economy has developed fast during 2005-2014,and the urbanization level has been improved greatly.However,regarding to the total area proportion of construction land,the change of land-use in the monitoring area is little and the annual change rate is only 0.13％.