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利用1992年、2002年和2012年DMSP/OLS夜间灯光遥感影像、MODIS NDVI产品、Landsat TM/ETM影像和统计数据,提取甘肃省县级及以上城市的建成区轮廓,对比分析了统计–植被指数法与现有基于DMSP数据中普遍采用的4种常规方法在快速提取城市轮廓中的优劣.结果表明:统计–植被指数法较好地集成了统计数据法的高效、计算简便、数据量小的特点,以及较高分辨率空间数据法对细节反映好的优势,提取的结果误差较其余4种方法低.对提取的城市建成区以DMSP灰度值为权重计算了城市重心轨迹,并采用城市扩展强度和城市紧凑度指数,分析了近20 a甘肃省主要城市空间形态的变化特征,城市建成区的扩展模式主要表现为“圈层式”延伸和“跳跃式”新城区的建立.
Based on the DMSP / OLS night-time remote sensing images, MODIS NDVI products, Landsat TM / ETM images and statistics in 1992, 2002 and 2012, the contour of built-up areas in cities of county level and above in Gansu Province was extracted. The statistical-vegetation index The results show that the statistical-vegetation index method integrates the efficiency of the statistical data method well, the calculation is simple, and the data amount is small , As well as the advantages of the higher resolution spatial data method reflecting the detail, and the error of the extracted results is lower than the other four methods.According to the weighted value of DMSP gray value, the city center of gravity trajectory is calculated and adopted The intensity of urban expansion and the index of urban compactness, the paper analyzes the changing features of the spatial patterns of major cities in Gansu in the past 20 years. The expansion patterns of urban built-up areas mainly include the “sprawling” and “leaping” new urban areas The establishment of.