YI Han-feng,QING Xiao-xia,ZHAO Jin-xiang.Remote Sensing Technique for Automatic Extraction of Impervious Surface Data[J].China Water & Wastewater,2020,36(23 23):101-107.
Remote Sensing Technique for Automatic Extraction of Impervious Surface Data
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
23 23
Page:
101-107
Column:
Date of publication:
2020-12-01
- Keywords:
- remote sensing technique; extraction of impervious surface data; rainfall-runoff model; extraction of underlying surface data
- Abstract:
- Efficient and accurate extraction of impervious surface is crucial to rainfall-runoff simulation. Since the shortcomings of mixed pixels in the low and medium resolution remote sensing (RS) images and the spectral limitations of high resolution RS images, the remote sensing index method was used in a community in Chongqing to extend the spectral band. The separability between easily misclassified land types and other land types in the study area was significantly enhanced. The average minimum separation degree increased from 1.26, 0.16 and 0.69 before expansion to 3.29, 4.74 and 8.89, respectively, and the overall minimum average separation degree increased from 0.70 to 5.64. The object-oriented method based on eCognition Developer with FNEA image segmentation algorithm and K-nearest neighbor classification algorithm was adopted in automatic extraction of the impervious surface data. The results showed that by the confusion matrix the overall accuracy of the underlying surface extraction was 82.98%, the Kappa coefficient was 0.75, and the user accuracy of the impervious surface was 94.85%. The simulation results of SWMM model showed that the peak time error was 0, the Nash-Sutcliffe efficiency coefficient(NSE) was 0.92, and the peak runoff error was 9.56%, which indicated that the method not only had a high degree of automation and strong timeliness, but also had high simulation accuracy. It was especially suitable for efficient automatic extraction of impervious surface data in large-scale area in which manual extraction was not feasible.
Last Update:
2020-12-01