Synergistic Use of WorldView-2 Imagery and Airborne LiDAR Data for Urban Land Cover Classification

International Symposium on Earth Observation for One Belt and One Road

地球科学;政治学;社会学;经济学

Wu, M.F.^1,2 ; Sun, Z.C.^2,3 ; Yang, B.^1 ; Yu, S.S.^2,4

Hunan Normal University, Changsha, Hunan

410006, China^1

Key Laboratory of Digital Earth Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing

100094, China^2

Hainan Key Laboratory Earth Observation, Sanya, Hainan

572029, China^3

Shandong University of Science and Technology, Qingdao, Shandong

266510, China^4

关键词: Classification methods;    Hierarchical support vector machines;    High-resolution optical imagery;    Light detection and ranging;    Spectral characters;    Urban land cover classification;    Urban land cover mappings;    Urban remote sensing;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/57/1/012035/pdf
DOI  :  10.1088/1755-1315/57/1/012035

来源: IOP

【 摘 要 】

There are lots of challenges for deriving urban land cover types for high resolution optical imagery because of spectral similarity of different objects, mixed pixels, shadows of buildings and large tree crowns. In order to reduce these uncertainties, recently, it's a trend of the classification of urban land cover from multi-source sensors in the field of urban remote sensing. In this study, a hierarchical support vector machine (SVM) classification method was applied to the urban land cover mapping, using the WorldView-2 imagery and airborne Light Detection and Ranging (LiDAR) data. The results showed that: (1) The overall accuracy (OA) and overall kappa (OK) were 72.92% and 0.66 for WorldView-2 imagery alone; while the OA and OK were improved up to 89.44% and 0.87 for the synergistic use of the two types of data source. (2) Buildings and road/parking lots extracted from fused data were more precision and well-shaped. The two classes from fused data were optimally classified with higher producer's accuracy and user's accuracy than WorldView-2 imagery alone. The trees were also easily separated from the grasslands when the airborne LiDAR data was added. (3) The fused data could reduce the phenomenon of different spectral character of the complex and detailed objects. It was also helpful to address the problem of shadows from the high-rise buildings. The results from this study indicate that the synergistic use of high resolution optical imagery and airborne LiDAR data can be an efficient approach to improving the classification of urban land cover.