Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/88947
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Title: 3D map system for tree monitoring in Hong Kong using google street view imagery and deep learning
Authors: Li, M 
Yao, W 
Issue Date: 3-Aug-2020
Source: ISPRS annals of the photogrammetry, remote sensing and spatial information sciences, 3 Aug. 2020, v. V-3-2020, p. 765-772
Abstract: In densely built urban areas such as Hong Kong, the positive effect of urban trees is to help maintain high environmental and social sustainability for the city while unmanaged trees lead to negative effects such as accidents, outbreaks of pests and diseases. The public awareness of urban tree population has been increasing and preserving all the benefits offered by trees, a continuous monitoring concept would be required. In this work, an efficient 3D map system for tree inventory in Hong Kong is presented to the based on automated tree detection from publicly available Google street view (GSV) panorama images. First, Convolutional Neural Networks (CNNs) based object detector and classifier-YOLOv3 with pretrained model is adopted to learn GSV images to detect tree objects. GSV depth image has been utilized to decode depth values of each GSV panorama image and will provide accurate information to calculate the tree geographic position. A "field of view" filter was designed to remove duplicated tree detection within the overlapped areas followed by spatial clustering applied to further increase the tree localization accuracy. The average distance between the detected trees and ground truth data was achieved within 3 meters for selected roads used for the experiment. Second, a 3D Map platform prototype for facilitating the urban tree monitoring and management was developed. Currently, there is no true 3D platform for interpreting the results of tree records in Hong Kong city areas. With the help of webGL technology, contemporary browsers are able to show 3D buildings, terrain and other scene components together with the obtained tree records in an open source 3D GIS platform, the level of visualization is enhanced as all the detected trees are placed on the 3D digital terrain model. Consequently, it is easy for end-users to know the actual position of the trees and their distribution.
Keywords: 3D map
Convolutional neural networks
Google street view
Tree management
Urban areas
Publisher: Copernicus Publications
Journal: ISPRS annals of the photogrammetry, remote sensing and spatial information sciences 
ISSN: 2194-9042
EISSN: 2194-9050
DOI: 10.5194/isprs-Annals-V-3-2020-765-2020
Description: 2020 24th ISPRS Congress on Technical Commission III, 31 August - 2 September 2020
Rights: © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License (https://creativecommons.org/licenses/by/4.0/).
The following publication Li, M. and Yao, W.: 3D MAP SYSTEM FOR TREE MONITORING IN HONG KONG USING GOOGLE STREET VIEW IMAGERY AND DEEP LEARNING, ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci., V-3-2020, 765–772, https://doi.org/10.5194/isprs-annals-V-3-2020-765-2020, 2020 is available at https://dx.doi.org/10.5194/isprs-Annals-V-3-2020-765-2020
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