A method for identifying the number of building floors based on shadow information

doi:10.6046/zrzyyg.2022226

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Abstract

Acquiring the number of building floors can provide data support and decision-making services for urban safety and disaster hazards. The number is primarily acquired through manual investigation and statistics currently. Furthermore, the automatic inversion of building heights based on remote sensing images suffers from low algorithmic efficiency, incomplete extraction, and a low automation degree. To acquire the number of building floors quickly and extensively, this study designed an identification algorithm based on GF-7 satellite images. First, shadow lines were automatically extracted using the fishing net method based on preprocessing such as principal component analysis. Then, the building height was calculated based on the geometric relationship formed by the shadow, and the building height was then converted into the number of building floors. Finally, the error in the extraction results was corrected through support vector machine regression, aiming to eliminate the influence of the measurement error of the shadow length. With Chaoyang District in Beijing as the study area, this study conducted model training and testing of the identification algorithm. As shown by the experimental results with Zhengzhou City in Henan Province as the verification area, the overall identification accuracy was 90.21%, with an identification error of three floors at most for buildings with 6~50 floors. This study provides novel technical support and application service for automatically acquiring the number of building floors rapidly and extensively based on satellite data.

Keywords detection of building shadow feature optimization automatic extraction of shadow lines based on the fishing net method support vector machine regression identification of the number of building floors

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TP79

Issue Date: 19 September 2023

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	Zhixin LI
	Mengfei WANG
	Weijie JIA
	Song JI
	Yufei WANG

Cite this article:

Zhixin LI,Mengfei WANG,Weijie JIA, et al. 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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https://www.gtzyyg.com/EN/10.6046/zrzyyg.2022226 OR https://www.gtzyyg.com/EN/Y2023/V35/I3/97

Fig.1 Building floor extraction process

Fig.2 Shadow extraction and optimization process

Fig.3 Shadow length calculation process

Fig.4 A geometric diagram of the sun, satellites and buildings

Fig.5 Study area sample

Fig.6 Baidu panoramic azimuth map

Tab.1 Sample data

Tab.2 Examples of floor extraction results in study area

Tab.3 Building floor test results

Fig.7 Histogram of experimental results

Fig.8 Building floor prediction results

Tab.4 Building level verification results

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