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利用 1996年 2月和 1999年 11月的TM影像 ,通过对漾弓江流域的遥感影像的光谱特征分析 ,建立地物光谱模型 ,提取区域城乡聚落的时空分布信息。在此基础上 ,根据分形几何理论计算漾弓江流域城乡聚落不同时段空间形态的分形维数 ,从其变化分析流域内聚落空间形态的特征。结果表明 ,欠发达地区城乡聚落空间形态具有分形现象 ,并且城市与农村集镇的分形维数变化不一致 ,1996年丽江地震和 1998年大丽线的开通加速了丽江城和鹤庆城的发展 ,使其形态趋于复杂、不稳定性增大。
Based on the TM images of February 1996 and November 1999, spectral features of remote sensing images in Yangge River were analyzed to establish the spectral model of terrestrial objects and to extract the spatial and temporal distribution of urban and rural settlements in the region. On this basis, according to the fractal geometry theory, the fractal dimension of spatial form of urban and rural settlements in Yanggegong river valley at different periods was calculated, and the characteristics of spatial pattern of settlement within the basin were analyzed. The results show that the fractal dimension of urban and rural settlements in underdeveloped areas is fractal and the fractal dimension changes between urban and rural markets are inconsistent. The Lijiang earthquake in 1996 and the opening of Dali Line in 1998 accelerated the development of Lijiang City and Heqing City. Its morphology tends to be complex and its instability increases.