依据V—I—S模型,以兰州市LandsatTM影像为数据源,利用线性光谱混合模型进行亚像元分解,以获取植被覆盖度的空间分布。在此基础上,采用分区统计、景观格局指数、空间自相关分析等方法对研究区植被覆盖景观的空间格局及其分异进行测度,为定量评价河谷型城市生态环境提供更精确的研究方法。
Based on vegetation- impervious surfacesoil(V - I - S) model, Landsat TM data is unmixed by linear spectral mixture model in Lanzhou to calculate the proportion of vegetation cover and impervious surface area. Zonal statistics, landscape metrics and spatial autocorrelation analysis are adopted to analyze the spatial variation of vegetation cover.