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Multispectral LiDAR data for extracting tree points in urban and suburban areas

Created by
  • Haebom

Author

Narges Takhtkesha, Gabriele Mazzacca, Fabio Remondino, Juha Hypp a, Gottfried Mandlburger

Outline

This paper highlights the importance of monitoring urban tree dynamics to support urban greening policies and reduce risks to power infrastructure. We present a study on tree point extraction using multispectral LiDAR (MS-LiDAR) and a deep learning (DL) model. To overcome the limitations of conventional airborne LiDAR due to the complex urban environment and tree diversity, we utilized MS-LiDAR, which captures both 3D spatial and spectral data. We evaluated three state-of-the-art models: Superpoint Transformer (SPT), Point Transformer V3 (PTv3), and Point Transformer V1 (PTv1). The results show that the SPT model achieves 85.28% mIoU, demonstrating superior time efficiency and accuracy. Furthermore, adding the pseudo-normalized difference vegetation index (pNDVI) to the spatial information yielded the highest detection accuracy, reducing the error rate by 10.61 percentage points. This study demonstrates the potential of MS-LiDAR and DL to improve tree extraction and inventory.

Takeaways, Limitations

Takeaways:
We demonstrate that combining MS-LiDAR and deep learning models can improve the accuracy and efficiency of urban tree point extraction.
In particular, the SPT model shows excellent performance.
Tree detection accuracy can be further improved by utilizing pNDVI.
Providing a technological foundation that can contribute to urban green space management and power infrastructure risk management.
Limitations:
Lack of specific descriptions of the characteristics of the dataset used in the study (e.g., diversity of urban environments, tree types).
Comparative analysis with other deep learning models is limited.
Further research is needed on applicability and scalability to real-world urban environments.
Further research is needed on the use of spectral indices other than pNDVI.
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