文章摘要

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Title:: Population Estimation of Sichuan Baoxing County Based on High Precision Buildings in Tianditu

Author(s):: ZHAO Zhen; GUO Hongmei; ZHANG Ying; SHEN Yuan; (Sichuan Earthquake Agency,Chengdu 610041,Sichuan,China)

Keywords:: Tianditu; residential buildings; population estimation; Sichuan Baoxing County

摘要:: 为了提高震前灾害风险评估和震后灾情快速评估工作中人口空间分布估计的准确性,利用2016年四川宝兴县乡镇人口数据及天地图中的建筑物数据,运用居住建筑人口密度方法得到四川宝兴县各乡镇居住建筑物尺度的人口分布矢量数据,并利用实地调研获取的单体建筑物实际人口进行精度验证。实验结果表明:以居住建筑物体积作为人口空间分布指示因子建模,得到的拟合精度为0.902 7,人口平均相对误差为15.23%,结果具有可靠性,可为震前灾害风险评估和震后灾情快速评估提供更为可靠的数据支撑。

Abstract:: In order to improve the accuracy of pre-earthquake disaster risk assessment and estimate the population spatial distribution in post-earthquake disaster rapid assessment,based on the population data of villages and towns surveyed in Sichuan Baoxing County in 2016 and the building data in Tianditu,we use the method of population density of residential buildings to obtain the vector data of population distribution at the scale of residential buildings in villages and towns of Baoxing County,and verify the accuracy of the actual population of individual building through field investigation. The experimental results show that taking the volume of residential buildings as the indicator of population spatial distribution,the fitting accuracy is 0.902 7,and the average relative error of population is 15.23%,which provides more reliable data support for pre-earthquake disaster risk assessment and post-earthquake disaster rapid assessment.