上海滩涂植被资源遥感分析

The vegetation resource at the intertidal zone in Shanghai using remote sensing

利用2003年8月2日L andsat5-TM多光谱遥感影像,运用遥感处理软件ERDA S Im ag ine 8.6,经几何校正分幅裁剪等图像预处理后,采用监督分类和目视解译相结合对上海市滩涂植被进行解译分析。结合全球定位系统(GPS)样点定位,对分类结果进行全面的野外核实和修正,同时利用地理信息系统(G IS)对解译结果进行数据合成,统计出滩涂各类植被的分布区域及面积等数据。实际调查及其分析统计显示,上海滩涂植物群落总面积为21302.1hm2,主要植被组成为芦苇、海三棱草及互花米草三大群落,滩涂植物群落具有明显的高程梯度分布规律。大尺度的上海市滩涂植被的空间分布现状及其数量调查为上海市滩涂资源的合理规划、生物多样性保护和可持续开发利用提供科学依据。

This study investigated the use of satellite remote sensing for the mapping of vegetation in the intertidal zone of the Shanghai region. A Landsat5-TM multi-spectral satellite image, dated August 2, 2003, was used. The image was processed using the ERDAS Imagine 8.6 image processing software. A subset of the Landsat image was geometrically corrected. Information on the spectral properties of the vegetation were integrated with expert systems knowledge to produce a classification for the intertidal, vegetation. An extensive field survey in situ was then carried out to verify and revise the results of the image classification. The revised results of the classification were integrated using a GIS platform and the spatial distribution and quantities of the intertidal plant communities were analyzed. The results showed that the total area of the intertidal vegetation in the Shanghai region was 21302. lhm^2 and the vegetation was mostly composed of Phragmites australis communities, Scirpus mariqueter communities and Spartina alterniflora communities. There was a distinct zonation in the distribution of the intertidal vegetation communities along a gradient of altitude. The results of this research on the intertidal vegetation in Shanghai will provide a sound basis for resource management and planning, preservation of biodiversity, sustainable development and utility of wetlands in the region.