CAJ | 학술논문

针对地区发展不平衡现象导致DMSP/OLS数据提取城市建成区时全局最佳阈值分割法精度不高的问题，基于DMSP/OLS非辐射定标夜间灯光平均强度数据提出一种分区最佳阈值分割方法进行城市建成区面积的估算。利用陕西省1992、1997、2002、2007及2012共5个年份的DMSP/OLS数据进行验证，结果表明：与统计数据相比，该方法对各年份建成区面积估算误差均小于1.27％；与全局最佳阈值法相比，其平均误差降低0.49％。而且，该方法估算的建成区面积变化速率与统计数据基本一致。
침대지구발전불평형현상도치DMSP/OLS수거제취성시건성구시전국최가역치분할법정도불고적문제，기우DMSP/OLS비복사정표야간등광평균강도수거제출일충분구최가역치분할방법진행성시건성구면적적고산。이용합서성1992、1997、2002、2007급2012공5개년빈적DMSP/OLS수거진행험증，결과표명：여통계수거상비，해방법대각년빈건성구면적고산오차균소우1.27％；여전국최가역치법상비，기평균오차강저0.49％。이차，해방법고산적건성구면적변화속솔여통계수거기본일치。
For a low accuracy problem from those methods based on an globally optimal threshold using DMSP /OLS data to extract urban time-spatial change information due to unbalanced development of different city groups for a given study region ,a novel thresholding segmentation method by minimizing errors from each sub -region of study region was proposed to extract urban built-up area and change information of urban using a long time series DMSP /OLS averaged nighttime light intensity data without radiometric calibration .In the experiment , five time node DMSP/OLS data in Shaanxi province in 1992、1997、2002、2007 and 2012 was used to verify the proposed method .The conclusions can be drawn that the proposed method can achieve less error than 1.27%in estimating urban built-up area for each year com-pared to statistical data ,the proposed method has an error rate averagely 0.49% less than the global method .Also the extracted change information using the proposed method is in line with the actual situation .