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利用南京市1988、1998、2003和2006年的LandsatTM遥感影像,采用邻域分析方法,提取1988—2006年间3个时段南京地区聚落占地率变化速率最快的5%区域作为聚落动态的热点,并对其空间分布格局的变化规律进行了研究。结果表明:聚落增长热点和萎缩热点总体上随城市的扩张而外移,其中,增长热点主要发生于建成区边缘外侧6km以内的区域,而萎缩热点的高发区位于建成区边缘外侧1km以内,在城乡梯度上二者都随离建成区边缘距离的增加而减少。在不同方向上,热点发生的频度、幅度具显著的差异性,且表现出易受短期城市发展决策的影响,阶段性重点开发地区往往成为聚落变化的热点,并导致热点集中分布区位的阶段性差异。某一时期萎缩热点在空间上集中分布的区位往往是前一时期增长热点集中发生的区位,反映了城市化过程中聚落快速增长后可能伴随着相对较大规模的重组、整合过程。
Using the Landsat TM remote sensing images of 1988, 1998, 2003 and 2006 in Nanjing, the neighborhood analysis method was used to extract the 5% region with the fastest rate of change of occupancy rate in Nanjing from 1988 to 2006 as a hot spot for settlement dynamics. And studied the changing rules of its spatial distribution pattern. The results show that the hot spots for settlement growth and shrinking hot spots move outwards with the expansion of the city as a whole. Among them, the growth hot spots occur mainly in the area within 6km outside the edge of the built-up area, while the high incidence areas of shrinkage hot spots are within 1km outside the edge of the built- Both urban and rural gradients decrease as the distance from the edge of the built-up area increases. In different directions, the occurrence frequency and magnitude of hot spots have significant differences, and they are susceptible to the impact of short-term urban development decisions. The key development areas are often the focus of changes in settlements and lead to hot spots concentrated in the distribution stage Sex differences. The spatial distribution of shrinking hot spots in a given period tends to be the focus of growth hot spots in the previous period, reflecting the relatively large-scale reorganization and integration that may follow the rapid growth of settlements in urbanization.