基于多源遥感数据和DEM的沱江流域人口分布与地形起伏度关系研究
发布时间：2019-03-13 15:47
【摘要】：地形起伏度是反映地形特征的重要指标,对人口空间分布有着重要影响.基于GIS/RS技术,集成DMSP/OLS灯光数据、NDVI等多源遥感数据对沱江流域人口统计数据进行了空间化,并从DEM中提取地形起伏度,通过定性和定量的分析方法,分析了人口密度与地形起伏度之间的关系.结果表明:人口空间分布值域介于496.67~9 896.4 km-2之间,其空间分布特征呈现出从城区中心向周围逐渐递减的态势,精度验证表明,人口空间分布具有一定的客观性和精确性.地形起伏度值域介于0.229~7.054之间,且由北向南逐渐减小的空间分布态势.人口空间分布与地形起伏度的关系分析表明:两者之间存在显著负相关关系,其关系散点图呈现"L"状分布.当地形起伏度为0.805时,两者关系出现拐点,即地形起伏度大于0.805时,人口空间分布陡然降低,单位面积内人口数呈现平缓减少的空间分布态势.对地形起伏度进行自然间断点5级分类后发现,地形起伏度前3级(0.229~0.509)的区域占全区总面积79.85%,分布着占全区88.23%的人口数.
[Abstract]:Terrain fluctuation is an important index to reflect the terrain characteristics and has an important influence on the spatial distribution of population. Based on GIS/RS technology, integrated DMSP/OLS lighting data, NDVI and other multi-source remote sensing data, the population statistics of Tuojiang River Basin were spatialized, and the terrain fluctuation was extracted from DEM, and the qualitative and quantitative analysis method was adopted. The relationship between population density and terrain fluctuation is analyzed. The results show that the spatial distribution range of population is between 496.67 and 9 896.4 km-2, and the spatial distribution characteristics of the population decrease gradually from the center of the city to the surrounding area. The spatial distribution of population has certain objectivity and accuracy. The range of terrain fluctuation is between 0.229 and 7.054, and the spatial distribution trend decreases gradually from north to south. The analysis of the relationship between the spatial distribution of population and the degree of terrain fluctuation shows that there is a significant negative correlation between the spatial distribution of population and the degree of terrain fluctuation. When the terrain fluctuation is 0.805, there is a turning point between the two, that is, when the terrain fluctuation is more than 0.805, the spatial distribution of the population decreases abruptly, and the number of population in the unit area shows a flat decreasing spatial distribution. On the basis of the classification of the degree of natural discontinuity, it is found that the area of the first three grades (0.229 ~ 0.509) accounts for 79.85% of the total area of the whole area, and the population of 88.23% of the total area is distributed.
【作者单位】： 内江师范学院地理与资源科学学院;
【基金】：国家自然科学基金(41401235) 四川省教育厅基金(15ZB0275)
【分类号】：C922
[Abstract]:Terrain fluctuation is an important index to reflect the terrain characteristics and has an important influence on the spatial distribution of population. Based on GIS/RS technology, integrated DMSP/OLS lighting data, NDVI and other multi-source remote sensing data, the population statistics of Tuojiang River Basin were spatialized, and the terrain fluctuation was extracted from DEM, and the qualitative and quantitative analysis method was adopted. The relationship between population density and terrain fluctuation is analyzed. The results show that the spatial distribution range of population is between 496.67 and 9 896.4 km-2, and the spatial distribution characteristics of the population decrease gradually from the center of the city to the surrounding area. The spatial distribution of population has certain objectivity and accuracy. The range of terrain fluctuation is between 0.229 and 7.054, and the spatial distribution trend decreases gradually from north to south. The analysis of the relationship between the spatial distribution of population and the degree of terrain fluctuation shows that there is a significant negative correlation between the spatial distribution of population and the degree of terrain fluctuation. When the terrain fluctuation is 0.805, there is a turning point between the two, that is, when the terrain fluctuation is more than 0.805, the spatial distribution of the population decreases abruptly, and the number of population in the unit area shows a flat decreasing spatial distribution. On the basis of the classification of the degree of natural discontinuity, it is found that the area of the first three grades (0.229 ~ 0.509) accounts for 79.85% of the total area of the whole area, and the population of 88.23% of the total area is distributed.
【作者单位】： 内江师范学院地理与资源科学学院;
【基金】：国家自然科学基金(41401235) 四川省教育厅基金(15ZB0275)
【分类号】：C922
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