Building height inversion based on the complex shadow measurement method

doi:10.6046/zrzyyg.2023121

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Abstract

Building heights are necessary for urban informatics, providing a significant basis for the planning and early warning of risks for urban construction. The shadow method, which can measure the heights of urban buildings on a large scale at a low cost, faces challenges such as low efficiency, accuracy, and robustness in building height inversion in complex shadow scenes. This study proposed a measurement method for these scenes. First, the shadows were measured and delineated using the fishing net method combined with multiple constraints. Second, the shadow lengths of all the zones divided were obtained, and the optimal values were determined using the quartile method and the bidirectional approximation strategy. Third, the shadow lengths were determined through a comprehensive assessment of the optimal values of all zones. The results show that 90.6% of building heights calculated using the new method exhibited absolute errors ranging from 0 to 5 m. Therefore, this method features elevated accuracy of building height inversion for various complex shadow scenes, laying a basis for research into the inversion and expansion of urban building heights.

Keywords fishing net method zonal statistics quartile method to eliminate gross error bidirectional approximation strategy optimal value evaluation

ZTFLH:

TP79

Issue Date: 03 September 2024

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	Zhixin LI
	Song JI
	Dazhao FAN
	Ding GAO
	Yongjian LI
	Ren WANG

Cite this article:

Zhixin LI,Song JI,Dazhao FAN, et al. Building height inversion based on the complex shadow measurement method[J]. Remote Sensing for Natural Resources, 2024, 36(3): 108-116.

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https://www.gtzyyg.com/EN/10.6046/zrzyyg.2023121 OR https://www.gtzyyg.com/EN/Y2024/V36/I3/108

Fig.1 Building shadow measurement technique route

Fig.2-1 Building shadow scene

Fig.2-2 Building shadow scene

Fig.3 Partition measurement

Fig.4 Determine the optimal value

Fig.5 Optimal value evaluation technique route

Fig.6 A visualization of the study area

Fig.7 Schematic diagram of geometric relationship between building and shadow

Fig.8 Schematic diagram of partition measurement results

Tab.1 Statistic of measurement error

Fig.9 Error of building height estimation in different shadow scenes

Tab.2 Building height error statistics

Fig.10 Statistical chart of building height error

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[1]	LI Zhixin, WANG Mengfei, JIA Weijie, JI Song, WANG Yufei. A method for identifying the number of building floors based on shadow information[J]. Remote Sensing for Natural Resources, 2023, 35(3): 97-106.

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