论文部分内容阅读
长江不仅具有长度这一非空间属性,还具有重心、方位、密度以及形状等多种空间分布属性。为了对长江的空间分布特征进行统计分析,提出了一种基于球面坐标的空间分布统计方法。采用空间随机抽样的方法,通过对组成长江水系的2种有限线段(即原始数据线段和等长切分线段)进行了不放回空间随机抽样,估计了长江球面重心位置的不确定性。为了解长江水系空间数据固有的多尺度特性,还研究了长江水系不同分辨率的空间切分(1 000 m、100 m、10 m)条件下的球面重心的规律。长江球面重心的计算方法不仅适用于球面线状物体球面重心的计算,也适用于球面面状物体重心的计算。研究长江水系的空间分布特征可以增加人们对长江水系的认知,为研究长江流域的经济、政治等相关的研究提供重要的地理参考信息或背景信息。
The Yangtze River not only has the length of this non-spatial attribute, but also has a variety of spatial distribution attributes such as center of gravity, bearing, density and shape. In order to make a statistical analysis of the spatial distribution characteristics of the Yangtze River, a spatial distribution statistical method based on spherical coordinates was proposed. The space random sampling method was used to estimate the uncertainty of the center of gravity of the Yangtze River by randomly sampling the two finite line segments (ie, the original data line segments and the equidistant cutting line segments) that make up the Yangtze River. In order to understand the inherent multiscale characteristics of spatial data of the Yangtze River water system, the law of the spherical center of gravity of the Yangtze River water system at spatial resolution (1 000 m, 100 m, 10 m) with different resolutions was also studied. The calculation method of the center of gravity of the Yangtze River is not only applicable to the calculation of the spherical center of gravity of a spherical linear object but also to the calculation of the center of gravity of a spherical planar object. Studying the spatial distribution characteristics of the Yangtze River water system can increase people’s cognition of the Yangtze River water system and provide important geo-referenced information or background information for the study of economy and politics in the Yangtze River basin.