基于OLI、VIIRS数据的南京城镇用地提取结果对比分析

Contrastive Analysis of Nanjing Urban Land Extraction Results Based on OLI and VIIRS Data

以南京市为研究区,基于DMSP/OLS和NPP-VIIRS 2种夜间灯光数据,用突变检测法计算南京市城镇用地提取的最佳阈值,并基于该阈值进行南京市城镇用地提取,最后用2013年南京土地利用数据验证2种夜间灯光数据提取城镇用地的精度,对比分析2种数据在城市尺度上的提取精度差异。结果表明基于NPP-VIIRS数据提取南京城镇用地总体精度比DMSP/OLS数据高6.85%,经济发展水平越低的区域,NPP-VIIRS数据提取城镇用地的精度提高越多。

Taking Nanjing City as the study area, based on the nighttime light data of DMSP/OLS and NPP-VIIRS, we used the mutation detection method to calculate the optimal threshold of urban land in Nanjing City. And then, we extracted the urban land in Nanjing City based on the threshold value. Finally, we verified the accuracy of urban land extraction from the two night light data by the land use data of 2013, and contrastive analyzed the accuracy difference of two data on city scale. The results show that the overall accuracy of urban land extraction based on NPP-VIIRS data is 6.85 %, higher than that of DMSP/OLS data. The lower the level of economic development, the higher the accuracy of urban land extraction based on NPP-VIIRS data.