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Desertification expansion significantly suppresses photosynthetic peak capacity of arid ecosystems at the global scale 在全球尺度上,沙漠化扩张显著抑制了干旱生态系统光合峰值容量
IF 8.6 Q1 REMOTE SENSING Pub Date : 2025-12-18 DOI: 10.1016/j.jag.2025.105042
Kaiyang Qiu , Qingbin Zhang , Yingzhong Xie , Mingjie Shi , Chengyun Wang , Tong Dong , Jun Ma , Panxing He
Arid ecosystems occupy about two-fifths of the global land surface, and fluctuations in their productivity play a pivotal role in global carbon sequestration and ecosystem service provision. However, the global-scale effect of desertification expansion on the annual maximum photosynthetic peak has not yet been systematically quantified. In this study, 30-m high-resolution desert cover data (GLCLUC) and multi-source remote-sensing photosynthetic indicators were integrated, using a space-for-time substitution framework to establish a global desertification scenario classification system. We quantitatively evaluated the influence of diverse desert expansion and contraction scenarios on the ecosystem photosynthetic peak (GPPmax). Results indicate that the average GPPmax in high-intensity expansion regions (HIEs) is 8.23 g C m−2 8d−1, whereas medium- to low-intensity expansion regions (MIEs) show a value of 8.95 g C m−2 8d−1. By contrast, medium- to low-intensity contraction regions (MIRs) and high-intensity contraction regions (HIRs) demonstrate markedly higher GPPmax values of 10.64 g C m−2 8d−1 and 17.64 g C m−2 8d−1, respectively. Regarding the photosynthetic peak difference (ΔGPPmax), expansion scenarios (HIEs, MIEs) significantly decrease ecosystem photosynthetic potential, with average ΔGPPmax reductions of 1.19–3.95 g C m−2 8d−1 relative to contraction scenarios (HIRs, MIRs). The most pronounced losses occur in South America, North America, and Eurasia, with South America exhibiting reductions exceeding 6 g C m−2 8d−1. Additionally, ecosystems with initially higher photosynthetic potential experience greater GPPmax declines under intense desert expansion. This study provides the first global-scale evidence revealing how different desertification pathways modify ecosystem photosynthetic peaks and their regional disparities, offering critical scientific support for ecological restoration, carbon sequestration strategies, and land management across arid landscapes.
干旱生态系统约占全球陆地面积的五分之二,其生产力的波动在全球固碳和提供生态系统服务方面发挥着关键作用。然而,在全球尺度上,沙漠化扩张对年最大光合峰值的影响尚未得到系统的量化。本研究将30 m高分辨率沙漠覆盖数据(GLCLUC)与多源遥感光合指标相结合,采用时空替代框架建立全球沙漠化情景分类体系。定量评价了不同荒漠扩张收缩情景对生态系统光合峰值(GPPmax)的影响。结果表明,高强度膨胀区(HIEs)的平均GPPmax为8.23 g C m−2 8d−1,中低强度膨胀区(MIEs)的平均GPPmax为8.95 g C m−2 8d−1。相比之下,中低强度收缩区(MIRs)和高强度收缩区(HIRs)的GPPmax值分别为10.64 g C m−2 8d−1和17.64 g C m−2 8d−1。在光合峰值差(ΔGPPmax)方面,扩张情景(HIEs, MIEs)显著降低了生态系统光合潜力,相对于收缩情景(HIRs, MIRs),平均ΔGPPmax降低1.19-3.95 g C m−2 8d−1。最显著的损失发生在南美洲、北美洲和欧亚大陆,南美洲的减少量超过6 g C m−28d−1。此外,具有较高光合潜力的生态系统在剧烈的沙漠扩张下会经历更大的GPPmax下降。该研究首次提供了全球尺度的证据,揭示了不同沙漠化途径如何改变生态系统光合峰值及其区域差异,为干旱景观的生态恢复、碳固存策略和土地管理提供了重要的科学支持。
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引用次数: 0
High–low frequency feature fusion network for pavement crack segmentation in complex environments 复杂环境下路面裂缝分割的高低频特征融合网络
IF 8.6 Q1 REMOTE SENSING Pub Date : 2025-12-18 DOI: 10.1016/j.jag.2025.105048
Huazhong Jin, Guofeng Wu, Yi Cen
For routine road maintenance, accurate and efficient crack detection holds significant research value and practical importance. With advances in computer vision, image processing-based crack detection has achieved promising results. However, in complex environments, factors such as illumination and weather introduce noise interference, especially in high-resolution crack images where fine fracture features show heightened complexity and diversity. This often leads to degraded detection accuracy in such challenging scenarios. To address this, we propose FE-SegNeXt, a convolutional neural network segmentation framework tailored for high-resolution crack detection in complex environments. The algorithm leverages distinct characteristics of high- and low-frequency features in crack images: average pooling separates these features, while a dedicated Frequency Collaborative Enhancement Module (FCEM) independently enhances high- and low-frequency components before fusing multi-band information. This design significantly improves the model’s ability to extract subtle cracks from high-resolution images under noisy conditions. Additionally, we introduce a Locally Enhanced Feed-Forward Network (LE-FFN) to amplify perception of weak crack signals in local regions, further refining fine-grained feature extraction. Experimental results on the public datasets Sun520, Rain365, and BJN260 demonstrate that the proposed method achieves F1-scores of 61.55%, 62.57%, and 60.31%, respectively, outperforming existing crack detection algorithms.
对于日常道路养护而言,准确、高效的裂缝检测具有重要的研究价值和实际意义。随着计算机视觉技术的发展,基于图像处理的裂纹检测已经取得了可喜的成果。然而,在复杂的环境中,光照和天气等因素会引入噪声干扰,特别是在高分辨率裂缝图像中,精细裂缝特征显示出更高的复杂性和多样性。在这种具有挑战性的情况下,这通常会导致检测精度下降。为了解决这个问题,我们提出了FE-SegNeXt,这是一种为复杂环境中的高分辨率裂纹检测量身定制的卷积神经网络分割框架。该算法利用了裂缝图像中高频和低频特征的不同特征:平均池化分离这些特征,而专用的频率协同增强模块(FCEM)在融合多波段信息之前独立增强高低频成分。这种设计显著提高了模型在噪声条件下从高分辨率图像中提取细微裂纹的能力。此外,我们引入了局部增强前馈网络(LE-FFN)来放大局部区域的弱裂纹信号感知,进一步细化细粒度特征提取。在公共数据集Sun520、Rain365和BJN260上的实验结果表明,该方法的f1得分分别为61.55%、62.57%和60.31%,优于现有的裂纹检测算法。
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引用次数: 0
Climatic effects on U.S. agricultural productivity: Evidence and prediction from total factor productivity and crop yields 气候对美国农业生产力的影响:来自全要素生产力和作物产量的证据和预测
IF 8.6 Q1 REMOTE SENSING Pub Date : 2025-12-18 DOI: 10.1016/j.jag.2025.105028
Ruixin Yang , Sun Ling Wang , Qian Liu , Mengfei Xin
Climate conditions such as the dynamics of temperature and precipitation significantly influence agricultural production. Therefore, the climate-induced agricultural economic consequences cannot be neglected. This study employs machine learning models with time series climate data, a panel of state-by-year total factor productivity estimates (1960–2004) for 48 contiguous states of the United States (U.S.), and the yield data for corn and soybean (1960–2020) in the main producing states to quantify the potential climatic effects on U.S. agricultural productivity under different climate scenarios. The results show that the climate change impacts are spatially heterogeneous under the Representative Concentration Pathway (RCP) 4.5 and 8.5 climate change scenarios from 2020 to 2050. However, the effects on future agricultural productivity are consistently negative regardless of the region. The negative climatic effects on productivity growth will offset the advancements of U.S. agricultural productivity after 5–25 years under various climate change scenarios assuming the same advancement rates as the past. The predictions of the impacts could advance our understanding of future productivity growth in U.S. agriculture under climate change. The analysis results could also shed light on policy planning to mitigate various effects and threats to food security due to the changing climate.
气候条件,如温度和降水的动态显著影响农业生产。因此,气候引起的农业经济后果不容忽视。本研究采用时序气候数据的机器学习模型、美国48个相邻州的各州全要素生产率估算面板(1960-2004年)以及主要生产州的玉米和大豆产量数据(1960-2020年),量化不同气候情景下气候对美国农业生产率的潜在影响。结果表明:在代表性浓度路径(RCP) 4.5和8.5气候变化情景下,2020 - 2050年气候变化影响具有空间异质性;然而,无论在哪个地区,对未来农业生产力的影响始终是负面的。在假设与过去相同的发展速度的各种气候变化情景下,对生产率增长的负面气候影响将在5-25年后抵消美国农业生产率的进步。对影响的预测可以促进我们对气候变化下美国农业未来生产力增长的理解。分析结果还可以为政策规划提供启示,以减轻气候变化对粮食安全的各种影响和威胁。
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引用次数: 0
Satellite-observed acceleration of glacier velocity on the Antarctic Peninsula in response to climate warming 卫星观测到的南极半岛冰川速度对气候变暖的响应
IF 8.6 Q1 REMOTE SENSING Pub Date : 2025-12-18 DOI: 10.1016/j.jag.2025.105035
Yulong Kang , Shichang Kang , Bryan Riel , Tanuj Shukla , Tao Che , Zongli Jiang , Zhaoqiang Zhou , Qiangqiang Xu , Zhenfeng Wang , Wanqin Guo
The Antarctic Peninsula (AP) is experiencing rapid mass losses due to global warming in recent decades. Understanding high-resolution seasonal ice speed variability is essential for uncovering the spatiotemporal dynamics of glaciers and ice shelves and their response to ongoing climate change. Here, we present Sentinel-1 satellite-based observations of seasonal flow velocity changes in 581 glaciers on the AP during the period 2018–2023. We find that the glacier surface velocities exhibit an acceleration since the 21st century, with this trend intensifying substantially in recent years. Summer velocity acceleration was particularly pronounced in 2018–2023, with an average increase of 6.22 ± 5.90 % while annual speed increased by > 1.0 %. The summer acceleration of glacier flow was most notable on the Larsen Ice Shelf. Western AP glaciers showed higher velocities and experienced more rapid acceleration than those in the eastern. These changes are primarily driven by warming ocean waters and intensified surface melt. As climate warming persists, the observed acceleration of glacier flow and associated ice shelf mass loss on the AP are projected to persist, depending on the rate and magnitude of future forcing.
近几十年来,由于全球变暖,南极半岛(AP)正在经历迅速的大规模损失。了解高分辨率的季节性冰速变率对于揭示冰川和冰架的时空动态及其对持续气候变化的响应至关重要。本文利用Sentinel-1卫星对2018-2023年青藏高原581座冰川的季节流速变化进行了观测。我们发现,自21世纪以来,冰川表面速度呈加速趋势,近年来这一趋势明显加剧。2018-2023年夏季速度加速尤为明显,平均增长6.22±5.90%,年速度增长1.0%。夏季冰川流动加速在拉森冰架上最为显著。AP西部冰川速度更快,加速速度也比东部冰川快。这些变化主要是由海水变暖和地表融化加剧引起的。随着气候持续变暖,预估AP上观测到的冰川流动加速和相关冰架质量损失将持续,这取决于未来强迫的速率和大小。
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引用次数: 0
A spatially-informed interpretable deep learning framework for high-resolution nutrient monitoring in complex coastal waters 一个空间信息可解释的深度学习框架,用于复杂沿海水域的高分辨率营养监测
IF 8.6 Q1 REMOTE SENSING Pub Date : 2025-12-17 DOI: 10.1016/j.jag.2025.105025
Yiqiang Hu , Weikang Zhan , Qingyou He , Yunchen Liu , Haigang Zhan
Satellite monitoring of non-optically active nutrients remains an ongoing challenge due to their weak spectral signals. While artificial intelligence (AI) methods can improve estimates by incorporating spatiotemporal information, their dependence on simple geographic coordinates tends to oversimplify the complex dynamics of nutrient distribution in coastal waters, especially in data-sparse regions. To address this gap, we propose the Spatiotemporal Kernel Density Estimation Deep Neural Network (ST-KDE-DNN). This model leverages precomputed spatial influence fields, derived from river outlet locations using KDE, as direct inputs to establish a source-driven spatial prior that reflects complex mixing patterns. We applied the ST-KDE-DNN framework to retrieve Dissolved Inorganic Nitrogen (DIN) and Phosphorus (DIP) from Landsat-8/9 imagery in the Pearl River Estuary (PRE), a typical multi-outlet coastal system. Compared with models incorporating standard spatiotemporal predictors, incorporating the KDE achieved significantly higher precision, with a reduced Root Mean Square Error (RMSE) of 45% for DIN and 29% for DIP, respectively. The most prominent improvements occurred in complex mixing zones where river plumes overlap. Furthermore, Explainable AI (XAI) analysis confirmed that the KDE features were dominant predictors, which enhances model transparency and grounds its predictions in physical processes. Based on this framework, we generated high-resolution time series of DIN and DIP for the PRE, and further revealed their seasonal and inter-annual variabilities. The ST-KDE-DNN offers a scalable, physically-informed, and interpretable solution for advancing nutrient monitoring in complex estuarine and coastal systems worldwide.
由于非光学活性营养物质的光谱信号较弱,卫星监测仍然是一个挑战。虽然人工智能(AI)方法可以通过整合时空信息来改进估算,但它们对简单地理坐标的依赖往往会过度简化沿海水域(尤其是数据稀疏地区)营养物分布的复杂动态。为了解决这一差距,我们提出了时空核密度估计深度神经网络(ST-KDE-DNN)。该模型利用预先计算的空间影响场(使用KDE从河流出口位置导出)作为直接输入,建立反映复杂混合模式的源驱动空间先验。应用ST-KDE-DNN框架,对珠江口(PRE)典型的多出口海岸系统Landsat-8/9遥感影像中溶解无机氮(DIN)和磷(DIP)进行了反演。与纳入标准时空预测因子的模型相比,纳入KDE的模型获得了更高的精度,DIN和DIP的均方根误差(RMSE)分别降低了45%和29%。最显著的改善发生在河流羽流重叠的复杂混合区。此外,可解释的人工智能(XAI)分析证实,KDE特征是主要的预测因素,这增强了模型的透明度,并将其预测建立在物理过程的基础上。基于此框架,我们生成了PRE的DIN和DIP的高分辨率时间序列,并进一步揭示了它们的季节和年际变化。ST-KDE-DNN为推进全球复杂河口和沿海系统的营养监测提供了可扩展,物理信息和可解释的解决方案。
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引用次数: 0
Examining the spatial configuration of street junctions across cities: a fractal approach on intra-urban clusters 跨城市街道交叉口的空间配置研究:城市内部集群的分形方法
IF 8.6 Q1 REMOTE SENSING Pub Date : 2025-12-17 DOI: 10.1016/j.jag.2025.105021
Wei Zhu , Ding Ma , Biao He , Xiaomin Lu , Yebin Chen , Jing Ying , Chengpeng Li , Lin Li , Renzhong Guo
Urban streets form the backbone of cities, and variations in street-junction spatial configuration provide valuable insights into urban form and function, both of which exhibit fractal and scaling characteristics in their structural and statistical properties. However, these patterns emerge from the interaction of multiple spatial processes operating at different scales, making it difficult to capture and compare their form-function relationships using single-scale analyses. To address this challenge, this study proposes a new α–β framework for multi-scale urban form comparison, grounded in fractal theory. Using a progressive clustering method, we construct scaling profiles for multiple cities, deriving the α (form) and β (function) parameters to systematically compare urban structures with differing morphologies and to identify urban clusters at their characteristic scales. This approach transforms the subjective perception of morphology into an actionable analytical tool, enabling integrated form-function assessment and overcoming the challenges of comparative studies from different urban systems. Overall, the proposed α–β framework effectively deconstructs urban complexity, as evidenced by its application to a comparative analysis of nine global metropolises.
城市街道是城市的支柱,街道交叉口空间配置的变化提供了对城市形态和功能的宝贵见解,两者在结构和统计特性上都表现出分形和尺度特征。然而,这些模式是在不同尺度上运行的多个空间过程的相互作用中产生的,这使得使用单尺度分析很难捕捉和比较它们的形式-功能关系。为了解决这一挑战,本研究提出了一个基于分形理论的多尺度城市形态比较的新α -β框架。采用渐进式聚类方法,构建了多个城市的尺度轮廓,推导了α(形式)和β(功能)参数,系统地比较了不同形态的城市结构,并在其特征尺度上识别了城市群。这种方法将形态学的主观感知转化为可操作的分析工具,实现了形式-功能的综合评估,克服了来自不同城市系统的比较研究的挑战。总体而言,所提出的α -β框架有效地解构了城市复杂性,其应用于九个全球大都市的比较分析证明了这一点。
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引用次数: 0
An automated method for estimating the depth of melt ponds using ICESat-2 LiDAR point cloud data: application to surface melt of Arctic sea ice 利用ICESat-2激光雷达点云数据估算融化池深度的自动化方法:应用于北极海冰表面融化
IF 8.6 Q1 REMOTE SENSING Pub Date : 2025-12-16 DOI: 10.1016/j.jag.2025.105033
Xiaoyi Shen , Haili Li , Chang-Qing Ke
The depth of melt ponds upon Arctic sea ice is a critical indicator for understanding the state of sea ice and the progression of climate change. The advent of the ICESat-2 lidar altimeter offers a promising avenue to monitor melt ponds, and existing studies are capable of detecting melt pond location and depth. Here we propose a novel approach that incorporates ICESat-2 photon positioning and elevation uncertainties. By converting the photon elevation distribution along the satellite track into a two-dimensional image where horizontal and vertical axes represent track distance and elevation, we employ image classification techniques to distinguish the surface and bottom of melt ponds. This provides a fully automated method for identifying melt ponds, and then the estimation of their depths. Converting photon information into images effectively simplifies the computation. We tested this method on 100 randomly distributed melt pond samples of varying sizes and depths. Out of these, 97 melt ponds were successfully identified. A comparison with manually annotated data revealed an average absolute bias of 5 cm and a correlation coefficient of 0.86, outperforming other methods. This approach can detect large and deep melt ponds with widths greater than 17 m and depths ranging from 0.3 to 2 m, which can be further used to monitor the melt ponds in the whole Arctic. It facilitates the acquisition of more detailed melt pond depth information, which is crucial for quantifying the surface melt of Arctic sea ice.
北极海冰上融化池的深度是了解海冰状况和气候变化进程的关键指标。ICESat-2激光雷达高度计的出现为监测熔池提供了一条有前途的途径,现有的研究能够探测熔池的位置和深度。本文提出了一种结合ICESat-2光子定位和高程不确定性的新方法。通过将卫星轨道上的光子高程分布转换成二维图像(横轴和纵轴分别表示轨道距离和高程),利用图像分类技术区分熔池的表面和底部。这提供了一种完全自动化的方法来识别融化池,然后估计它们的深度。将光子信息转换成图像有效地简化了计算。我们在100个随机分布的不同大小和深度的熔池样本上测试了这种方法。其中,97个融池被成功识别。与人工标注的数据比较,平均绝对偏差为5 cm,相关系数为0.86,优于其他方法。该方法可以探测到宽度大于17 m、深度在0.3 ~ 2 m之间的大而深的融化池,可进一步用于整个北极地区的融化池监测。它有助于获得更详细的融池深度信息,这对于量化北极海冰的表面融化至关重要。
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引用次数: 0
RRDPM: Relay residual diffusion probabilistic model for global typical land and seabed DEM super-resolution RRDPM:全球典型陆地和海底DEM超分辨率中继剩余扩散概率模型
IF 8.6 Q1 REMOTE SENSING Pub Date : 2025-12-16 DOI: 10.1016/j.jag.2025.105031
Jianbing Chen , Ziyin Wu , Fanlin Yang , Mingwei Wang , Xianhai Bu , Xiaodong Cui , Jihong Shang , Dineng Zhao , Jieqiong Zhou , Yang liu
Global digital elevation models (DEMs) play a crucial role in modern scientific research and human activities. However, acquiring comprehensive elevation data at global scale remains challenging, particularly for oceanic regions, with the current open-access global open DEM resolution limited to 15 arc-seconds (approximately 450 m). In order to further improve the global DEM resolution, we propose an innovative Relay Residual Diffusion Probabilistic Model (RRDPM) for DEM super-resolution tasks based on diffusion model principles. Our model achieves distribution transformation between high- and low-resolution DEMs through tens of steps. Moreover, RRDPM introduces two types of inherently indivisible sampling equations, and we prove that each of them has different advantageous positions, and integrate these advantageous positions using a “relay race” approach. In addition, we discard the conventional downsampling-super-resolution paradigm, by utilizing paired datasets of global 15 arc-second and local 3 arc-second DEMs, so that our method can be trained and tested in real-world situations. The experimental results show that the RRDPM reduces the RMSE by 20.73 % and 22.77 % for land and seabed regions, respectively, and improves the PSNR by 2.23 dB and 2.34 dB, respectively, for the same areas, representing significant advancements in the current global DEM detail recovery. The code of RRDPM is available at https://github.com/SuperChen100/RRDPM.
全球数字高程模型(dem)在现代科学研究和人类活动中发挥着至关重要的作用。然而,在全球范围内获取综合高程数据仍然具有挑战性,特别是对于海洋地区,目前开放获取的全球开放DEM分辨率限制在15弧秒(约450米)。为了进一步提高DEM的全局分辨率,基于扩散模型原理,提出了一种用于DEM超分辨率任务的中继剩余扩散概率模型(Relay Residual Diffusion probability Model, RRDPM)。该模型通过数十个步骤实现了高分辨率和低分辨率dem之间的分布转换。此外,RRDPM引入了两类固有不可分的采样方程,并证明了它们各自具有不同的优势位置,并采用“接力赛”的方法对这些优势位置进行积分。此外,我们抛弃了传统的下采样-超分辨率范式,利用全球15弧秒和本地3弧秒的dem配对数据集,以便我们的方法可以在现实世界中进行训练和测试。实验结果表明,RRDPM在陆地和海底区域的RMSE分别降低了20.73%和22.77%,在相同区域的PSNR分别提高了2.23 dB和2.34 dB,代表了当前全球DEM细节恢复的显著进步。RRDPM的代码可在https://github.com/SuperChen100/RRDPM上获得。
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引用次数: 0
Moving vehicles tracking from satellite video data based on spatiotemporal high-order relation learning and reasoning 基于时空高阶关系学习与推理的卫星视频移动车辆跟踪
IF 8.6 Q1 REMOTE SENSING Pub Date : 2025-12-13 DOI: 10.1016/j.jag.2025.105015
Ziyuan Feng , Xianfeng Zhang , Bo Zhou , Miao Ren , Xiaobo Zhi
Tracking moving vehicles in satellite videos presents several challenges, including complex background interference and the difficulty of detecting small targets. Most existing multiple object tracking (MOT) methods utilize convolutional models to capture local semantics or self-attention mechanisms to address global semantics for moving target detection. However, these methods tend to struggle with small and visually similar targets, making them particularly vulnerable to complex background interference, which often results in a large number of false positives and missed detections. Furthermore, many current approaches rely on the Hungarian matching algorithm or other intricate, unlearnable association optimization methods to achieve effective tracking once relevant information is gathered. This reliance often yields suboptimal outputs from the network models. To tackle these issues, this article presents an end-to-end graph network based on spatiotemporal high-order relation learning and reasoning for vehicle tracking in satellite video. The representation module of spatial high-order relations is designed to capture the spatial high-order relations between moving vehicles and their local environments, as well as global key references. Meanwhile, the temporal semantic reasoning module focuses on analyzing the evolution of these spatial high-order relations over time, thereby constructing the spatiotemporal high-order connections among the targets of interest and ensuring the continuous and stable detection of moving vehicles. Ultimately, a graph network based on spatiotemporal high-order relation reasoning is developed to perform learnable associations of target information across video frames, achieving a globally optimal solution to the tracking problem. Comparative experiments on the SatVideoDT, CGSTL, and ShuangQing-1 satellite video datasets demonstrate that the proposed method effectively enables end-to-end tracking of moving vehicles, attaining state-of-the-art performance across most evaluation metrics. On the SatVideoDT dataset, the model achieves a Multiple Object Tracking Accuracy (MOTA) of 65.1% and an Identity F1 Score (IDF1) of 70.9%. The proposed network model holds significant promise for the automated interpretation of satellite video data. The code is available at https://github.com/zsspo/GHOST-R.
在卫星视频中跟踪移动车辆存在一些挑战,包括复杂的背景干扰和检测小目标的困难。现有的多目标跟踪(MOT)方法大多利用卷积模型捕获局部语义或自注意机制来处理运动目标检测的全局语义。然而,这些方法往往与小的和视觉上相似的目标作斗争,使它们特别容易受到复杂背景干扰,这往往导致大量的误报和漏检。此外,目前的许多方法依赖于匈牙利匹配算法或其他复杂的、不可学习的关联优化方法,一旦收集到相关信息,就可以实现有效的跟踪。这种依赖通常会从网络模型中产生次优输出。为了解决这些问题,本文提出了一种基于时空高阶关系学习和推理的端到端图网络,用于卫星视频中的车辆跟踪。空间高阶关系表示模块旨在捕捉运动车辆与其局部环境以及全局关键引用之间的空间高阶关系。同时,时间语义推理模块侧重于分析这些空间高阶关系随时间的演变,从而构建感兴趣目标之间的时空高阶联系,保证对运动车辆的连续稳定检测。最后,开发了基于时空高阶关系推理的图网络,实现了跨视频帧目标信息的可学习关联,实现了跟踪问题的全局最优解。在SatVideoDT、CGSTL和双清一号卫星视频数据集上的对比实验表明,所提出的方法有效地实现了移动车辆的端到端跟踪,在大多数评估指标上都达到了最先进的性能。在SatVideoDT数据集上,该模型实现了65.1%的多目标跟踪精度(MOTA)和70.9%的身份F1分数(IDF1)。所提出的网络模型对卫星视频数据的自动解释具有重要的前景。代码可在https://github.com/zsspo/GHOST-R上获得。
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引用次数: 0
A coupled InSAR—Integrated probability model framework for goaf locating under different extraction conditions 不同开采条件下采空区定位的耦合insar集成概率模型框架
IF 8.6 Q1 REMOTE SENSING Pub Date : 2025-12-13 DOI: 10.1016/j.jag.2025.105024
Teng Wang , Yunjia Wang , Feng Zhao , Zhanguo Ma , Liyong Li , Sen Du , Kewei Zhang , Nianbin Zhang , Dawei Zhou , Xinpeng Diao , José Fernández
Accurately locating goafs is essential for assessing and mitigating surface instability risks, protecting infrastructure, and guiding urban planning and ecological restoration efforts. The Probability Integral Model (PIM), Improved PIM (IPIM), and Probability Density Function (PDF) models have demonstrated effectiveness in locating underground goafs. However, due to the specific assumptions underlying each model, their applicability is limited under different extraction conditions. To this end, a novel inversion framework, termed the Locating Goaf Method based on an Integrated Probability Model (LGM-IPM), is proposed to locate underground goafs under different extraction conditions using InSAR-derived deformation. First, an integrated probability model (IPM) is developed by systematically analyzing the applicability boundaries of the PIM, IPIM, and PDF models. The proposed model accurately characterizes the relationship between surface deformation and the geometric parameters of underground goafs under varying mining intensities. Subsequently, an Adaptive Mining-Affected Pixel identification algorithm (AMAPI) is developed based on the spatiotemporal characteristics of mining-induced deformation, enabling efficient input data reduction and significantly improving computational efficiency. The geometric parameters of the underground goafs are then estimated using the Genetic Algorithm-Particle Swarm Optimization (GA-PSO). These results from the Qianyingzi coal mine, China, demonstrate that the proposed LGM-IPM effectively estimates goaf parameters under different extraction conditions. The integrated AMAPI algorithm achieves a 91% reduction in computation time by effectively filtering out unaffected pixels. Moreover, the LGM-IPM model yields the highest precision, with an average relative error of 6.38%, representing improvements of 59.89% over LGM-PIM (15.90%) and 25.69% over LGM-IPIM (8.58%). These findings demonstrate that the proposed LGM-IPM framework provides a computationally efficient and more generalizable solution for InSAR-based goaf locating under different mining conditions.
准确定位采空区对于评估和减轻地表失稳风险、保护基础设施、指导城市规划和生态恢复工作至关重要。概率积分模型(PIM)、改进PIM (IPIM)和概率密度函数(PDF)模型在地下采空区定位中已经证明了有效性。然而,由于每个模型的具体假设,在不同的提取条件下,它们的适用性受到限制。为此,提出了一种新的反演框架——基于综合概率模型的采空区定位方法(LGM-IPM),利用insar导出的变形对不同提取条件下的地下采空区进行定位。首先,通过系统分析PIM、IPIM和PDF模型的适用边界,建立了综合概率模型(IPM)。该模型准确表征了不同开采强度下地表变形与地下采空区几何参数之间的关系。随后,基于采动变形的时空特征,提出了一种自适应采动影响像素识别算法(AMAPI),实现了有效的输入数据缩减,显著提高了计算效率。然后利用遗传算法-粒子群优化(GA-PSO)对地下采空区的几何参数进行估计。前营子煤矿的结果表明,所提出的LGM-IPM方法可以有效地估计不同开采条件下的采空区参数。集成的AMAPI算法通过有效地过滤掉未受影响的像素,减少了91%的计算时间。LGM-IPM模型精度最高,平均相对误差为6.38%,比LGM-PIM(15.90%)提高59.89%,比LGM-IPIM(8.58%)提高25.69%。这些结果表明,LGM-IPM框架为不同开采条件下基于insar的采空区定位提供了一种计算效率高且更具通用性的解决方案。
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引用次数: 0
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International journal of applied earth observation and geoinformation : ITC journal
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