Toward a foundation model for forest point clouds
作者: Yuanwen Yue, Stefano Puliti, Damien Robert, Atakan Topaloğlu, Binbin Xiang, Maciej Wielgosz, Jan Dirk Wegner, Rasmus Astrup, Christian Rupprecht, Konrad Schindler
分类: cs.CV, cs.RO
发布日期: 2026-09-21
备注: Project page: https://prs-eth.github.io/ForPT
🔗 代码/项目: GITHUB
💡 一句话要点
提出森林点云基础模型以解决森林属性提取问题
🎯 匹配领域: 支柱二:RL算法与架构 (RL & Architecture) 支柱九:具身大模型 (Embodied Foundation Models)
关键词: 森林点云 基础模型 自监督学习 可迁移表示 生态监测
📋 核心要点
- 现有森林点云模型通常专注于特定任务,导致适应新环境时需要大量标注和计算资源。
- 本文提出了一种基于LitePT的基础模型,通过自监督学习实现跨多样森林环境的可迁移表示。
- 实验结果显示,自监督预训练在标注稀缺情况下显著提升模型性能,并加速收敛速度。
📝 摘要(中文)
随着人工智能模型在森林清查中的应用日益增多,现有模型通常专注于单一任务、传感器和森林类型,导致适应性成本高昂。本文探讨是否可以通过单一预训练模型学习跨多样森林清查环境的可迁移表示。基于LitePT,我们建立了强大的监督基线,设定了森林语义和实例分割、树种分类及年龄回归基准的新状态。随后,我们整理了涵盖多种森林生态系统的大规模无标签语料库,并利用自监督学习对相同骨干网络进行预训练。通过比较从零开始训练、监督预训练和自监督预训练,我们系统评估了表示学习策略。结果表明,自监督预训练在标注稀缺时加速模型收敛并提升性能,且在下游任务中表现出更好的可迁移性。
🔬 方法详解
问题定义:本文旨在解决现有森林点云模型在多样森林环境中的适应性问题,现有方法通常需要大量标注,导致高昂的成本和时间消耗。
核心思路:通过建立一个基础模型,利用自监督学习在无标签数据上进行预训练,从而学习可迁移的表示,减少对特定任务的依赖。
技术框架:整体架构包括三个主要阶段:首先是建立强监督基线;其次是整理大规模无标签数据集;最后是使用自监督学习对模型进行预训练。
关键创新:最重要的创新在于通过自监督学习实现了在不同森林任务间的表示迁移,克服了传统方法的局限性。
关键设计:在模型设计中,采用LitePT作为骨干网络,设置了适当的损失函数以优化自监督学习过程,并在不同的标注预算下进行了系统评估。
🖼️ 关键图片
📊 实验亮点
实验结果表明,自监督预训练相比从零开始训练加速了模型收敛,并在标注稀缺的情况下性能提升显著。与任务特定的监督预训练相比,自监督预训练在下游任务中表现出更强的可迁移性,显示出更广泛的应用潜力。
🎯 应用场景
该研究的潜在应用领域包括森林资源管理、生态监测和环境保护等。通过提供一个通用的基础模型,能够有效降低森林清查的成本,提高数据处理效率,促进可持续发展和生态保护的决策支持。
📄 摘要(原文)
Forest inventories increasingly rely on artificial intelligence (AI) models to derive forest attributes from large-scale 3D point clouds. Current models are typically specialized to a single task, sensor, and forest type, making adaptation expensive in terms of annotations, computation, and expertise. We ask whether a single pretrained model can instead learn transferable representations across diverse forest inventory settings. Inspired by recent developments in language modelling and computer vision, we take a step toward a foundation model (FM) for 3D forestry. Using LitePT as backbone, we first establish a strong supervised baseline that sets a new state of the art on forest semantic and instance segmentation, tree species classification, and age regression benchmarks. We then curate a large-scale unlabelled corpus spanning airborne, UAV, and mobile laser scanning across diverse forest ecosystems, and pretrain the same backbone using self-supervised learning. We systematically evaluate representation learning strategies by comparing training from scratch, supervised pretraining, and self-supervised pretraining across four representative forestry tasks, under varying annotation budgets. Compared with training from scratch, self-supervised pretraining accelerates model convergence and consistently improves performance when annotations are scarce. Compared with task-specific supervised pretraining, self-supervised pretraining yields more transferable representations across downstream forestry tasks. These findings identify the practical regime in which pretrained representations are most valuable and suggest that instance discrimination, rather than forest semantics, is the main remaining obstacle to a general-purpose 3D forest foundation model. Code and models are available at: https://github.com/prs-eth/ForPT.