Bulletin of Surveying and Mapping ›› 2022, Vol. 0 ›› Issue (8): 128-132.doi: 10.13474/j.cnki.11-2246.2022.0244

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Building height extraction method based on sub-meter remote sensing image and its verification

LIU Xiaozhong1,2,3, FENG Cunjun1,2,3, DENG Xiaoyuan1,2,3, ZHAN Yuanzeng1,2,3, YU Hui1,2,3, WANG Xingkun1,2,3   

  1. 1. Zhejiang Academy of Surveying and Mapping Science and Technology, Hangzhou 330010, China;
    2. Zhejiang Application Center of Nature Resources Satellite Technology, Hangzhou 330010, China;
    3. Key Laboratory of National Geographic Census and Monitoring, MNR, Hangzhou 330010, China
  • Received:2021-10-26 Published:2022-09-01

Abstract: Building height is the basic reference data in modern urban monitoring, planning, management and economic activities. In order to realize the extraction of building height information, this paper presents a method for inversion of building height based on Boltzmann curve. First of all, through the spectral characteristics of the building image, the method of multi-scale segmentation and remote sensing index classification are used to obtain the interesting area of the building shadow, then we obtain the sub-pixel position of the shadow according to the Boltzmann curve function in order to get the shadow boundary by linear fitting. After that, a height inversion model based on the geometric relationship between the sun, satellites, buildings and their shadows is built. Finally, Ninghai county is selected as the experimental area, and the main satellite remote sensing data of GF-2, GJ-1, Beijing-2 and WorldView-2 which spatial resolution are better than 1m on orbit for accuracy verification. The experimental results show that the medium error in the calculated building height is better than 2.5meters, which can be used for urban satellite remote sensing monitoring.

Key words: sub-meter remote sensing image, Boltzmann curve, sub-pixel shadow extraction, building height extraction and verification

CLC Number: