用卫星数据生成高精度森林高度图,无需高分辨率影像。
Super-Resolved Canopy Height Mapping from Sentinel-2 Time Series Using Airborne LiDAR HD Reference Data across Metropolitan France
- 基于哨兵2号时序数据与机载激光雷达参考,端到端训练深度模型。
- 在2.5米分辨率下误差仅2.63米,优于现有卫星方法。
- 仅靠免费卫星和激光雷达数据,适合大范围森林监测。
细粒度森林监测对理解冠层结构及其动态至关重要,是碳储量、生物多样性和森林健康的关键指标。深度学习在此任务中表现优异,因其能整合光谱、时间和空间信号,共同反映冠层结构。为此,我们提出THREASURE-Net,一种面向树高回归与超分辨率的端到端框架。模型基于哨兵2号时序数据,在法国本土多个空间分辨率的机载激光雷达高清(LiDAR HD)数据支持下训练,生成年度树高地图。评估三种模型变体,分别输出2.5米、5米和10米分辨率的树高预测。THREASURE-Net不依赖任何预训练模型或超高分辨率光学影像来训练超分辨率模块,而是仅从激光雷达衍生的高度信息中学习。该方法优于现有基于哨兵数据的最先进方法,并可与基于超高分辨率影像的方法相媲美。其可部署以生成高精度年度冠层高度图,2.5米、5米和10米分辨率下的平均绝对误差分别为2.63米、2.70米和2.88米。这些结果凸显了THREASURE-Net利用免费卫星数据实现可扩展、低成本的温带森林结构监测的巨大潜力。THREASURE-Net源代码见:https://github.com/Global-Earth-Observation/threasure-net。
原文摘要 · Abstract (English)
Fine-scale forest monitoring is essential for understanding canopy structure and its dynamics, which are key indicators of carbon stocks, biodiversity, and forest health. Deep learning is particularly effective for this task, as it integrates spectral, temporal, and spatial signals that jointly reflect the canopy structure. To address this need, we introduce THREASURE-Net, a novel end-to-end framework for Tree Height Regression And Super-Resolution. The model is trained on Sentinel-2 time series using reference height metrics derived from LiDAR HD data at multiple spatial resolutions over Metropolitan France to produce annual height maps. We evaluate three model variants, producing tree-height predictions at 2.5 m, 5 m, and 10 m resolution. THREASURE-Net does not rely on any pretrained model nor on reference very high resolution optical imagery to train its super-resolution module; instead, it learns solely from LiDAR-derived height information. Our approach outperforms existing state-of-the-art methods based on Sentinel data and is competitive with methods based on very high resolution imagery. It can be deployed to generate high-precision annual canopy-height maps, achieving mean absolute errors of 2.63 m, 2.70 m, and 2.88 m at 2.5 m, 5 m, and 10 m resolution, respectively. These results highlight the potential of THREASURE-Net for scalable and cost-effective structural monitoring of temperate forests using only freely available satellite data. The source code for THREASURE-Net is available at: https://github.com/Global-Earth-Observation/threasure-net.
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