Abstract
Urban green volume is an important indicator for analyzing urban vegetation structure, ecological evaluation, and green-economic estimation. This paper proposes an object-based method for automated estimation of urban green volume combining three-dimensional (3D) information from airborne Light Detection and Ranging (LiDAR) data and vegetation information from high resolution remotely sensed images through a case study of the Lujiazui region, Shanghai, China. High resolution airborne near-infrared photographs are used for identifying the urban vegetation distribution. Airborne LiDAR data offer the possibility to extract individual trees and to measure the attributes of trees, such as tree height and crown diameter. In this study, individual trees and grassland are identified as the independent objects of urban vegetation, and the urban green volume is computed as the sum of two broad portions: individual trees volume and grassland volume. The method consists of following steps: generating and filtering the normalized digital surface model (nDSM), extracting the nDSM of urban vegetation based on the Normalized Difference Vegetation Index (NDVI), locating the local maxima points, segmenting the vegetation objects of individual tree crowns and grassland, and calculating the urban green volume of each vegetation object. The results show the quantity and distribution characteristics of urban green volume in the Lujiazui region, and provide valuable parameters for urban green planning and management. It is also concluded from this paper that the integrated application of LiDAR data and image data presents an effective way to estimate urban green volume.
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Yan Huang received the B. S. degree in Geographical Information System from Chengdu University of Technology, Chengdu, China, in 2010. She is currently a Ph.D. student in Cartography and Geographical Information System at Department of Geography, East China Normal University, Shanghai, China. Her current research interests focus on object-oriented analysis for remotely sensed images and LiDAR.
Bailang Yu received the B. S. degree and Ph.D. degree from East China Normal University, Shanghai, China in 2002 and 2009, respectively. He is currently an Associate Professor of Key Laboratory of Geographic Information Science (Ministry of Education) and Department of Geography, East China Normal University. His research interests include object-oriented analysis for remotely sensed images, LiDAR, Urban Remote Sensing, and GIS (Geographical Information System). His recent research projects have been funded by the National Natural Science Foundation of China, the Specialized Research Fund for the Doctoral Program of Higher Education, and the Fundamental Research Funds for the Central Universities of China.
Jianhua Zhou received the B. E. degree in Aerial Photogrammetry from Wuhan Institute of Surveying and Mapping, Wuhan, China in 1975 and the M. S. degree in Cartography and Geographical Information System from East China Normal University, Shanghai, China in 2000. She is currently an Associate Professor of Key Laboratory of Geographic Information Science (Ministry of Education) and Department of Geography, East China Normal University. Her research interests include quantitatively ecological remote sensing, remote sensing image analysis, and spatial data mining.
Chunlin Hu received the M. S. degree in Cartography and Geographical Information System from East China Normal University, Shanghai, China in 2004. She is currently an Engineer of Shanghai Landscape and City Appearance Administration Information Center.
Wenqi Tan received the M. S. degree in Cartography and Geographical Information System from East China Normal University, Shanghai, China in 2005. She is currently an Engineer of Shanghai Landscape and City Appearance Administration Information Center.
Zhiming Hu received the M. S. degrees in Cartography and Geographical Information System from East China Normal University, Shanghai, China in 2012. His research interests include mobile GIS and LiDAR.
Jianping Wu received the B. S. degree from Nanjing University, Nanjing, China in 1983, the M. S. degree from Peking University, Beijing, China, in 1986, and the Ph.D. degree from East China Normal University, Shanghai, China, in 1996. He is currently a Professor of Key Laboratory of Geographic Information Science (Ministry of Education) and Department of Geography, East China Normal University, China. His research interests include Geographical Information System Development and Remote Sensing Application.
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Huang, Y., Yu, B., Zhou, J. et al. Toward automatic estimation of urban green volume using airborne LiDAR data and high resolution Remote Sensing images. Front. Earth Sci. 7, 43–54 (2013). https://doi.org/10.1007/s11707-012-0339-6
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DOI: https://doi.org/10.1007/s11707-012-0339-6