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The use of Otsu algorithm and multi-temporal airborne LiDAR data to detect building changes in urban space

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Abstract

Building change detection techniques are essential for several urban applications. In this context, multi-temporal airborne LiDAR data has been considered an effective alternative since it has some advantages over conventional photogrammetry. Despite several works in the literature, the automatic class definition with great accuracy and performance remains a challenge in change detection. The developed strategies usually explore training samples or empirical thresholds to discriminate the classes. To overcome this limitation, we proposed an automatic building change detection method based on Otsu algorithm and median planarity attribute computed from eigenvalues. The main contribution corresponds to the automatic and unsupervised identification of building changes. The experiments were conducted using airborne LiDAR data from two epochs: 2012 and 2014. From qualitative and quantitative analysis, the robustness of the proposed method in detecting building changes in urban areas was evaluated, presenting completeness and correctness around 99% and 76%, respectively.

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Acknowledgements

The authors would like to thank Graduate Program on Cartographic Sciences from FCT-UNESP, Presidente Prudente-SP/Brazil; Sensormap Geotecnologia for providing the LiDAR data; São Paulo Research Foundation—FAPESP (grant no. 2019/05268-8); National Council for Scientific and Technological Development – CNPq (grant no. 308474/2019-8); and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES)—Finance Code 001.

Funding

This research was funded by São Paulo Research Foundation—FAPESP (grant no. 2019/05268–8).

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Conceptualization methodology and validation, RCS, MG, ACC, and GGP; methodology implementation, RCS; writing-original draft preparation, RCS; writing-review and editing, RCS, MG, ACC, and GGP; RCS and MG supervised this study. All authors wrote the manuscript.

Corresponding author

Correspondence to Renato César dos Santos.

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The authors declare no competing interests.

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dos Santos, R.C., Galo, M., Carrilho, A.C. et al. The use of Otsu algorithm and multi-temporal airborne LiDAR data to detect building changes in urban space. Appl Geomat 13, 499–513 (2021). https://doi.org/10.1007/s12518-021-00371-6

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  • DOI: https://doi.org/10.1007/s12518-021-00371-6

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