基于DMSP/OLS夜间灯光数据的县域建成区的提取方法研究——以重庆市为例  

The Research of Extraction Method for Built-up Areas in County Scale Based on DMSP/OLS Nighttime Lights Data:a Case Study of Chongqing

作　　者：朱康文 李月臣[4,2,3] 刘春霞[1,2,3] 周梦甜 王超[1] 黄晶晶[1] 史红敏[1] 

机构地区：[1]重庆师范大学地理与旅游学院 [2]重庆师范大学三峡生态环境遥感研究所 [3]重庆师范大学重庆市高校GIS应用研究重点实验室,重庆401331 [4]重庆师范大学职教师资学院

出　　处：《重庆师范大学学报（自然科学版）》2015年第6期61-67,F0003,共8页Journal of Chongqing Normal University:Natural Science

基　　金：国家自然科学基金(No.41201133);重庆市博士后科研项目特别资助基金(No.xm201102001);重庆市教委科技项目(No.CY120402);重庆市气象局开放基金(No.Kfjj-201103)

摘　　要：以DMSP/OLS稳定夜间灯光数据、重庆市统计年鉴和区县城区面积为数据源,按照"影像校正—阈值提取—最佳因子—拟合方程—方程验证—方程应用"的思路对县级尺度建成区的提取方法进行探索,并采用K-折交叉验证法对结果进行验证。结果显示:结合影像自校正法和辐射定标法进行数据预处理效果较好;采用动态阈值法提取的建成区面积相对误差在10%以内的占96.87%,表明动态阈值法对于提取建成区面积效果很好;SPSS软件中建立DN总值与23项因子之间的回归方程,拟合优度为0.999 5,说明采用23项因子反演DN总值是可行的;按照拟合方程提取出来的建成区面积与区县实际城区面积相对误差在10%以内的占93.75%,表明反演效果很好;交叉验证结果显示相对误差在10%以内的占80%,相对误差较大的点主要出现在渝东南生态保护区,其余功能区相对误差均较小,表明方法可以应用并推广。县级尺度建成区的提取方法的建立为灯光数据在县级尺度的应用提供了新的思路,为无法获取城区面积数据区域的建成区提取提供了一个很好的解决方法,对于城市化相关研究有很好的现实意义。Based on the DMSP/OLS nighttime light data,statistical yearbooks of Chongqing and counties urban area data.In order to find the extraction methods about the county scale built-up areas.Take the order with image correction;extract the threshold value,the best factor,the fitting equation,equation verification and the equation＇s applications.Using the K-fold cross-validation method to validate the results.The results show that combining the self-correction method and radiometric calibration method to preprocessing the images data have good effect.Take the dynamic threshold method to extract the built-up areas,and the relative error is less than 10% accounted for 96.87%.The result evidence shows that using this method to extract the built-up areas could acquire good effect.The regression equation in SPSS software between the total value of DN and the 23 factors,and the goodness of fit was 0.9995.According to the fitting equation to extracted the built-up areas,and compared with the actual urban area of counties the relative error is less than 10% accounted for 93.75%.The cross-validation results show that the relative error is less than 10% accounted for 80%.The relative error of southeastern ecological reserve of Chongqing was larger than other functional areas,and this method can be applied to practice and promote.This extraction method provides a new way of thinking for application the nighttime data in the county scale.Providing agood solution for extraction the nighttime data in the area which unable to get the urban area data.It has a good practical significance for related research in urbanization.

关 键 词：DMSP/OLS夜间灯光数据 K-折交叉验证法 影像自校正法 辐射定标法 动态阈值法 重庆 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置] P208[自动化与计算机技术—控制科学与工程]