唐山市植被动态变化遥感监测

Remote sensing monitoring of dynamic changes of vegetation information in Tangshan City

基于TM和ETM+遥感图像,分析唐山市绿地分布结构及变化趋势,对唐山市植被信息进行提取,为城市规划提供科学依据及技术支持。利用归一化差值植被指数(NDVI)计算植被信息图;设定合适的NDVI阈值参数和近红外波段的阈值参数,精确判定植被像元,并生成唐山市几个区域的植被信息结果图;利用1999—2009年3个时间段的植被信息图合成植被信息动态变化图,对植被信息动态变化图进行分析。结果表明,近10 a来,唐山市城区以公园为主的植被覆盖面积增加,城南南湖生态建设作用明显,唐山城区范围正在向外围扩展。

This paper aims at analyzing greenbelt distribution and change in Tangshan City and providing scientific basis and technical support for urban planning.In this paper,the authors provided a method for the extraction of the vegetation information in Tangshan City based on TM and ETM＋ data.Vegetation information graph was calculated firstly by normalized difference vegetation index（NDVI）,then through setting up the actual NDVI threshold parameter and the near infrared band threshold parameter,the accurate vegetation pixels were obtained,and vegetation information diagrams for several areas in Tangshan City were compiled.Using 3 periods of vegetation information diagrams during 1999—2009,a synthetic dynamic change diagram was computed.The diagram shows that,in the past 10 years,the park greenbelt as the mainly covering area of the city vegetation in Tangshan City has been increased.The effect of the South Lake ecological construction is obvious,and the city limits of Tangshan City have experienced expansion toward the peripheral area.