Real-Time Localization and Bimodal Point Pattern Analysis of Palms Using UAV Imagery

Kangning Cui; Wei Tang; Rongkun Zhu; Manqi Wang; Gregory D. Larsen; Victor P. Pauca; Sarra Alqahtani; Fan Yang; David Segurado; Paul Fine; Jordan Karubian; Raymond H. Chan; Robert J. Plemmons; Jean-Michel Morel; Miles R. Silman

arXiv · 2410.11124

Real-Time Localization and Bimodal Point Pattern Analysis of Palms Using UAV Imagery

Kangning Cui·Wei Tang·Rongkun Zhu·Manqi Wang·Gregory D. Larsen·Victor P. Pauca·Sarra Alqahtani·Fan Yang·David Segurado·Paul Fine·Jordan Karubian·Raymond H. Chan·Robert J. Plemmons·Jean-Michel Morel·Miles R. Silman

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Abstract

Understanding the spatial distribution of palms within tropical forests is essential for effective ecological monitoring, conservation strategies, and the sustainable integration of natural forest products into local and global supply chains. However, the analysis of remotely sensed data in these environments faces significant challenges, such as overlapping palm and tree crowns, uneven shading across the canopy surface, and the heterogeneous nature of the forest landscapes, which often affect the performance of palm detection and segmentation algorithms. To overcome these issues, we introduce PalmDSNet, a deep learning framework for real-time detection, segmentation, and counting of canopy palms. Additionally, we employ a bimodal reproduction algorithm that simulates palm spatial propagation to further enhance the understanding of these point patterns using PalmDSNet's results. We used UAV-captured imagery to create orthomosaics from 21 sites across western Ecuadorian tropical forests, covering a gradient from the everwet Chocó forests near Colombia to the drier forests of southwestern Ecuador. Expert annotations were used to create a comprehensive dataset, including 7,356 bounding boxes on image patches and 7,603 palm centers across five orthomosaics, encompassing a total area of 449 hectares. By combining PalmDSNet with the bimodal reproduction algorithm, which optimizes parameters for both local and global spatial variability, we effectively simulate the spatial distribution of palms in diverse and dense tropical environments, validating its utility for advanced applications in tropical forest monitoring and remote sensing analysis.

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Kangning Cui, Wei Tang, Rongkun Zhu, Manqi Wang, Gregory D. Larsen, Victor P. Pauca, Sarra Alqahtani, Fan Yang, David Segurado, Paul Fine, Jordan Karubian, Raymond H. Chan, Robert J. Plemmons, Jean-Michel Morel, Miles R. Silman. 2024-10-14. Real-Time Localization and Bimodal Point Pattern Analysis of Palms Using UAV Imagery. https://arxiv.org/abs/2410.11124

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