基于GIS的福州市生态环境遥感综合评价模型

MULTIPLE FACTORS-BASED REMOTE SENSING EVALUATION OF ECOLOGICAL ENVIRONMENT IN FUZHOU

在ENVI软件的支持下,利用TM卫星遥感数据提取福州市生态环境评价因子;利用1 10万地形数据,在GIS环境下生成高程和坡度(由等高线生成)栅格数据,并通过ERDAS转换成ENVI可读的数据格式,经过投影转换,使之与提取的环境因子进行复合,生成综合影像;通过线性回归方法确定植被、水分、热容量、土壤及地形等因子的权重,建立福州市生态环境遥感评价模型,并利用该模型对福州市的生态环境进行评价。

With the support of ENVI and based on TM satellite RS data, the authors extracted the indicators of the ecological environment of Fuzhou city, which include vegetation, heat, humidity and brightness. The altitude and slope data obtained with the GIS method and demonstrated in the lattice form were converted by the ERDAS method into the data recognizable in ENVI. The data in the new form were then combined with the extracted ecological environment indictors by way of projection to form comprehensive images. Then the linear regression method was adopted to identify the proportions of such factors as vegetation, moisture, heat, soil and terrain. Finally an RS-based model was established to evaluate the vegetation ecological environment of Fuzhou city.