Egyptian Journal of Remote Sensing and Space Sciences最新文献_第6页

New insights into the Menyuan Ms6.9 Earthquake, China: 3D slip inversion and fault modeling based on InSAR remote sensing approach 中国门源Ms6.9地震的新认识：基于InSAR遥感方法的三维滑动反演和断层模拟

IF 3.7 3区地球科学 Q2 ENVIRONMENTAL SCIENCES

Egyptian Journal of Remote Sensing and Space Sciences

Pub Date : 2025-01-27 DOI: 10.1016/j.ejrs.2024.11.003

Mohamed I. Abdelaal , Min Bao , Mohamed Saleh , Mengdao Xing

Harnessing high-precision spaceborne InSAR data, this study investigates the seismic impacts of the Ms 6.9 Menyuan earthquake in Qinghai, China, on January 8, 2022. The earthquake occurred at the intersection of the Lenglongling (LLLF) and Tuolaishan (TLSF) faults within the Qilian Haiyuan Fault (QL-HYF) zone, causing extensive infrastructure damage but no fatalities. Previous studies explored the step-over rupture zone and slip distribution of the Menyuan event but often relied on oversimplified rectangular dislocation models, insufficient for capturing complex fault ruptures. This simplification impedes accurate representation of curved fault segments in the QL-HYF zone, leading to unclear slip distribution estimates, particularly at the transition from LLLF strike-slip to TLSF thrust behavior. To address these limitations, this study employs a 3D triangulated angular dislocation slip-inversion approach in an isotropic half-space, enabling precise modeling of curved fault geometries. Leveraging Differential InSAR (D-InSAR) and Pixel Offset Tracking (POT), we reconstructed the earthquake’s 3D displacement field and extracted surface fault traces, informing our angular dislocation model for accurate coseismic slip distribution. Our results revealed significant horizontal displacement, with 38.5 cm of left-lateral movement accompanied by a 4 cm downward thrust. The slip model showed 2.7 m of slip along the LLLF and 0.8 m along the TLSF, concentrated at shallow depths between 2 and 7 km, highlighting surface rupture. The transition zone between the faults acted as a valve, modulating rupture progression and controlling energy release. These findings refine the understanding of coseismic deformation and slip distribution, supporting seismic hazard mitigation and emergency response strategies.

利用高精度星载InSAR数据，研究了2022年1月8日发生在中国青海门源的6.9级地震的地震影响。地震发生在祁连海源断裂（QL-HYF）带内冷龙岭（LLLF）和沱来山（TLSF）断裂的交汇处，造成了广泛的基础设施破坏，但没有人员死亡。以往的研究对门源事件的跨台阶破裂带和滑动分布进行了探索，但往往依赖于过于简化的矩形位错模型，不足以捕捉复杂的断层破裂。这种简化阻碍了QL-HYF带弯曲断层段的准确表示，导致滑动分布估计不明确，特别是在从LLLF走滑到TLSF逆冲行为的过渡阶段。为了解决这些限制，本研究在各向同性半空间中采用了三维三角角位错滑移反演方法，从而能够精确地模拟弯曲断层几何形状。利用差分InSAR （D-InSAR）和像素偏移跟踪（POT），我们重建了地震的三维位移场，并提取了地表断层的轨迹，为我们的角位错模型提供了准确的同震滑动分布信息。我们的研究结果显示了显著的水平位移，38.5厘米的左侧移动伴随着4厘米的向下推力。滑移模型显示，沿中低陆面和TLSF分别有2.7 m和0.8 m的滑移，集中在2 ~ 7 km的浅层深度，地表破裂突出。断层间的过渡带起着调节破裂进程和控制能量释放的阀门作用。这些发现完善了对同震变形和滑移分布的理解，为地震灾害缓解和应急响应策略提供了支持。

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引用次数: 0

Identifying water-lubricated faults in the vicinity of a dam 确定大坝附近的水润滑断层

IF 3.7 3区地球科学 Q2 ENVIRONMENTAL SCIENCES

Egyptian Journal of Remote Sensing and Space Sciences

Pub Date : 2025-01-24 DOI: 10.1016/j.ejrs.2025.01.003

Carolle Fomekong Lambou , Carolle Fomekong Lambou , Jorelle Larissa Meli’i , Harlin Ekoro Nkoungou , Kasi Njeudjang , Andre Michel Pouth Nkoma , Philippe Njandjock Nouck

The development of remote sensing, with its many applications, combined with field data collected by geologists, geophysicists and geotechnical scientists, is now contributing to sustainable development in the mining, infrastructure and civil protection sectors. This study integrates remote sensing and the audiomagnetotelluric (AMT) method to identify faults lubricated or potentially lubricated by water in the vicinity of a dam. The data set includes SRTM_DEM images and AMT data from seven stations collected in the study area. The results from remote sensing show 284 lineaments with a main NE-SW direction, including 17 corresponding to existing faults in the area. The lineament density map shows that stations A1, A3 and A7 are located in the most fractured zones. The Bahr dimensional analysis shows that, at the same frequencies, Swift skew values of less than 0.1 and two-dimensionality parameter values of greater than 0.1 are observed at stations A3, A5 and A7, suggesting the presence of 2D structures correlating with the faults at these stations, oriented NE-SW, NE-SW and NNE-SSW respectively. In addition, the 2D and 3D resistivity models make it possible to distinguish at what depth the faults highlighted can be lubricated by water in the study area containing a total of 39 faults, 17 of which are normal and may be partially or fully lubricated depending on whether they interact with the hydrographic or drainage network. These identified lubricated faults need further study, as they could induce weak earthquakes.

遥感的发展及其许多应用，加上地质学家、地球物理学家和岩土技术科学家收集的实地数据，现在正在促进采矿、基础设施和民防部门的可持续发展。本研究将遥感与大地电磁（AMT）方法相结合，用于识别大坝附近有水润滑或可能有水润滑的断层。数据集包括研究区7个站点的SRTM_DEM图像和AMT数据。遥感结果显示，以NE-SW为主要方向的断层线284条，其中17条与区内已有断层相对应。线状密度图显示A1、A3和A7站位于裂缝最多的区域。Bahr维数分析表明，在相同频率下，A3、A5和A7台站的Swift偏度值小于0.1，二维参数值大于0.1，表明这些台站存在与断层相关的二维构造，方向分别为NE-SW、NE-SW和NNE-SSW。此外，利用二维和三维电阻率模型，可以区分研究区内39条断层中突出的断层在什么深度上可以被水润滑，其中17条是正常的，根据它们是否与水文或排水网络相互作用，可能是部分或完全润滑的。这些已确定的润滑断层需要进一步研究，因为它们可能引发弱地震。

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引用次数: 0

Cot-DCN-YOLO: Self-attention-enhancing YOLOv8s for detecting garbage bins in urban street view images Cot-DCN-YOLO：用于城市街景图像中垃圾箱检测的自关注增强YOLOv8s

IF 3.7 3区地球科学 Q2 ENVIRONMENTAL SCIENCES

Egyptian Journal of Remote Sensing and Space Sciences

Pub Date : 2025-01-23 DOI: 10.1016/j.ejrs.2025.01.002

Shan Dong , Wenhao Xu , Huihui Zhang , Litao Gong

Accurately and quickly obtaining information from garbage bins has great application value in smart city construction and urban environmental management. However, existing deep learning methods are affected by factors such as occlusion, large geometric appearance differences, and multi-scale, leading to missed detections in garbage bin detection results. We propose a Cot-DCN-YOLO model for garbage bin detection, which is designed to effectively extract contextual information with the Double Convolutions Semantic Transformation (DCST) module, which addresses the vulnerability of garbage bins to occlusion. According to the large geometric appearance differences when garbage bins are damaged, we propose the C2f embedded with DCNv2 (DC2f) module, which can adaptively adjust the target shape with a flexible receptive field. Furthermore, considering the multi-scale characteristics of garbage bins in images, we introduce the SPPCSPC module. Experimental results show that compared with other methods, Cot-DCN-YOLO achieves the best results on our self-made garbage bin dataset, with Precision, Recall, and mAP reaching 77.1%, 69.4%, and 74.0%, respectively, outperforming existing SOTA methods.

准确、快速地获取垃圾箱信息在智慧城市建设和城市环境管理中具有很大的应用价值。然而，现有的深度学习方法受到遮挡、几何外观差异大、多尺度等因素的影响，导致垃圾箱检测结果出现漏检。我们提出了一种用于垃圾箱检测的Cot-DCN-YOLO模型，该模型旨在利用双卷积语义转换（DCST）模块有效地提取上下文信息，从而解决垃圾箱容易被遮挡的问题。针对垃圾箱损坏时的几何外观差异较大，我们提出了嵌入DCNv2 （DC2f）模块的C2f，该模块可以自适应调整目标形状，具有灵活的接受场。此外，考虑到图像中垃圾箱的多尺度特征，我们引入了SPPCSPC模块。实验结果表明，与其他方法相比，Cot-DCN-YOLO在自制的垃圾箱数据集上取得了最好的结果，Precision、Recall和mAP分别达到77.1%、69.4%和74.0%，优于现有的SOTA方法。

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引用次数: 0

Fusing satellite imagery and ground geochemical data to map alteration zones for gold exploration in western Nigeria 融合卫星图像和地面地球化学数据绘制尼日利亚西部金矿蚀变带图

IF 3.7 3区地球科学 Q2 ENVIRONMENTAL SCIENCES

Egyptian Journal of Remote Sensing and Space Sciences

Pub Date : 2025-01-16 DOI: 10.1016/j.ejrs.2025.01.001

S.A. Alimi, E.J.M. Carranza

As alteration mapping is vital in identifying signatures of specific mineral deposits, this study aimed to map alteration zones associated with orogenic gold mineralization in the Wawa area using remote sensing and geochemical data. Sentinel-2 satellite images were fused with an ALOS PRISM panchromatic image for spatial resolution enhancement. Image processing methods such as color compositing, band rationing, thresholding, and principal component analysis were used for hydrothermal alteration mapping. Field investigations, major, and trace element geochemical analysis of samples were applied for results validation. The findings showed that the significant lithologies in the Wawa area are migmatite, granite gneiss, quartzite, amphibolite/amphibole schist, phyllite, and granites. Gold occurs as micro-veins within amphibolite/amphibole schist and granite gneisses in close association with pyrite. Significant alterations observed at/around the gold mining sites are clay and iron oxide. There is increased alteration intensity at apparent contact zones between granite gneisses and schists. Geochemical data support the findings that most existing gold mining sites are within intense iron oxide and clay alteration zones, and that gold pathfinder elements such as Cu, As, Pb, and Ni occur anomalously within vein quartz and amphibolitic rock samples from the alteration zones in the Wawa area. Future exploration targets for orogenic gold in the Wawa area should be concentrated within similar alteration zones with no gold mining sites.

由于蚀变填图对于识别特定矿床特征至关重要，本研究旨在利用遥感和地球化学数据对Wawa地区造山带金矿化相关的蚀变带进行填图。将Sentinel-2卫星图像与ALOS PRISM全色图像融合以增强空间分辨率。采用颜色合成、波段定量、阈值分割、主成分分析等图像处理方法进行热液蚀变制图。采用野外调查、主要元素和微量元素地球化学分析对样品进行验证。结果表明，瓦洼地区主要岩性为混辉岩、花岗片麻岩、石英岩、角闪岩/角闪岩、千层岩和花岗岩。金以微脉状赋存于角闪岩/角闪岩片岩和花岗片麻岩中，与黄铁矿密切相关。在金矿附近观察到的显著变化是粘土和氧化铁。花岗岩片麻岩与片岩的明显接触带蚀变强度增大。地球化学数据支持了现有金矿点大多位于强氧化铁蚀变带和粘土蚀变带内的发现，并且在Wawa地区蚀变带的脉状石英和角闪岩样品中异常出现了Cu、as、Pb和Ni等寻金元素。今后瓦洼地区造山带金矿的找矿目标应集中在无金矿点的蚀变带内。

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引用次数: 0

GIS-based species distribution modeling of invasive Mnemiopsis leidyi in the southern caspian sea using satellite imageries 基于gis的里海南部入侵雷氏记忆藻物种分布卫星模拟

IF 3.7 3区地球科学 Q2 ENVIRONMENTAL SCIENCES

Egyptian Journal of Remote Sensing and Space Sciences

Pub Date : 2025-01-10 DOI: 10.1016/j.ejrs.2024.12.002

Mahdieh Abadijoo , Mehdi Gholamalifard , Mehdi Mokhtarzade , Parviz Jokar , Tiit Kutser , Andrey G. Kostianoy , Aleksander V. Semenov

Due to its unique variety of species, the Caspian Sea has great ecological-economic values and the people living on its coasts use this environmental asset as a source of income. Mnemiopsis leidyi’s invasion of this ecosystem in 1999, however, has led to instability of the ecosystem and decreased access to the services provided by it causing a decline in the population of Kilka fish and in the fishing industry. Accordingly, the present study attempted to carry out spatial modeling of M. leidyi using Multi-Criteria Evaluation (MCE) and Maximum Entropy (MaxEnt) models in summer and autumn. The main goal of comparing these two models was to find the best distribution sites of M. leidyi as an inhibiting species for the ecosystem services. The modelling was based on the following variables including: chlorophyll a concentration, photosynthetic active radiation (PAR), water temperature, turbidity, concentration of nitrogen, phosphorus, oxygen, salinity, sea level anomaly, depth, distance from the coast and bottom slope on Mazandaran coasts of Iran in the southern basin of the Caspian Sea. The findings indicated that the most favorable distribution of M. leidyi was in summer near the central (sub-region N 6563 in Behshahr and 6463 in Babolsar (and eastern coasts (sub-region N 6663 in Noshahr), and the least favorable distribution was near the western coast (sub-region N 6163 in Ramsar). In autumn, however, all the coastal zones had a high level of favorability for the viability of Mnemiopsis leidyi. ‘Distance from the coast’ and ‘depth’ were identified as the most important variables explaining the variation in the distribution of M. leidyi and helping to identify the favorable areas for the viability of M. leidyi in summer and autumn. The obtained results can help to understand better the behavior of M. leidyi, its spatial and temporal distribution, as well as to improve the ecosystem services in the southern basin of the Caspian Sea including in location of cage aquaculture sites.

由于其独特的物种多样性，里海具有巨大的生态经济价值，生活在里海沿岸的人们将这种环境资产作为收入来源。然而，leidyi在1999年入侵了这个生态系统，导致了生态系统的不稳定，并减少了对它提供的服务的获取，导致基尔卡鱼的数量和渔业的减少。因此，本研究尝试采用多准则评价（MCE）和最大熵（MaxEnt）模型对夏、秋两季莱茵的空间分布进行建模。比较这两种模型的主要目的是寻找作为生态系统服务抑制物种的雷氏菌的最佳分布点。该模型基于以下变量，包括：叶绿素a浓度、光合有效辐射（PAR）、水温、浊度、氮、磷、氧浓度、盐度、海平面异常、深度、距离海岸的距离和里海南部盆地伊朗Mazandaran海岸的底部坡度。结果表明：夏季，白沙赫尔地区n6563分区和巴波尔萨尔地区6463分区以及东部沿海地区Noshahr地区n6663分区是白沙赫尔地区最有利的分布区域，西部沿海地区拉姆萨尔地区n6163分区是白沙赫尔地区最不利的分布区域。然而，在秋季，所有沿海地区对雷氏记忆藻的生存能力都有很高的好感度。“离海岸的距离”和“深度”被认为是解释白僵菌分布变化的最重要变量，有助于确定夏季和秋季白僵菌生存的有利区域。研究结果有助于更好地了解里海南部海盆雷氏沼虾的习性及其时空分布，并有助于改善包括网箱养殖地点选址在内的生态系统服务。

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引用次数: 0

Comparison and accuracy assessment of unmanned aerial vehicle and terrestrial measurement in base map production 无人机与地面测量在底图制作中的比较与精度评估

IF 3.7 3区地球科学 Q2 ENVIRONMENTAL SCIENCES

Egyptian Journal of Remote Sensing and Space Sciences

Pub Date : 2025-01-08 DOI: 10.1016/j.ejrs.2024.12.003

Veysel Yildiz, Aydan Yaman

In the present era, unmanned aerial vehicles (UAVs) have become a prevalent tool for data and map production in the domain of remote sensing and photogrammetry, driven by advancements in technology. The production of base maps has become more straightforward, precise, economical, and time-efficient in recent years, largely due to the advent of UAVs and the subsequent development of new techniques. The base maps of the area were produced using two methods: Terrestrial measurement and UAV data. The squared mean errors were calculated and found to be my = ±1.49 cm, mx= ±1.58 cm and m_z = ±2.52 cm for ground control points, m_y = ±1.54 cm, m_x= ±1.65 cm and m_z = ±2.55 cm for check points and my = ±2.41 cm, mx= ±2.66 cm and m_z= ±3.47 cm for detail points. The results were found to fall within the specified limit values. It was therefore concluded that UAVs provide the anticipated accuracy for the production of base maps, which are required to be continually updated and form the basis for a range of projects and can be readily employed in this regard. This study demonstrates that base maps produced with UAV data meet the requisite scientific and academic standards, including accuracy and precision. Additionally, it illuminates the advantages of UAV data in base map production, particularly in terms of time, accuracy, and cost.

在当今时代，在技术进步的推动下，无人驾驶飞行器（uav）已成为遥感和摄影测量领域数据和地图生产的普遍工具。近年来，基地地图的制作变得更加直接、精确、经济和省时，主要是由于无人机的出现和随后新技术的发展。该地区的底图是通过两种方法制作的：地面测量和无人机数据。计算均方根误差，地面控制点my =±1.49 cm, mx=±1.58 cm, mz=±2.52 cm，检查点my =±1.54 cm, mx=±1.65 cm, mz=±2.55 cm，细部点my =±2.41 cm, mx=±2.66 cm, mz=±3.47 cm。结果被发现在规定的极限值之内。因此，得出的结论是，无人机为基础地图的制作提供了预期的准确性，这些地图需要不断更新，并形成一系列项目的基础，可以很容易地在这方面使用。该研究表明，利用无人机数据制作的基础地图符合必要的科学和学术标准，包括准确性和精度。此外，它阐明了无人机数据在基础地图制作中的优势，特别是在时间、精度和成本方面。

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引用次数: 0

Enhanced lithological mapping via remote sensing: Employing SVM, random trees, ANN, with MNF and PCA transformations 通过遥感增强岩性制图：采用支持向量机、随机树、人工神经网络、MNF和PCA转换

IF 3.7 3区地球科学 Q2 ENVIRONMENTAL SCIENCES

Egyptian Journal of Remote Sensing and Space Sciences

Pub Date : 2024-12-26 DOI: 10.1016/j.ejrs.2024.12.001

Mohamed Ali El-Omairi, Manal El Garouani, Abdelkader El Garouani

This study examines the performance of three classification algorithms—Support Vector Machines (SVM), Random Trees (RT), and Artificial Neural Networks (ANN)—applied to Landsat 9 and Sentinel-2 spectral data for lithological mapping. The study area, located in the Central Anti-Atlas, is covered by the 1:50,000 geological map of Aït Semgane, featuring diverse geological formations, ideal for testing advanced remote sensing techniques. Results show that SVM, particularly with Minimum Noise Fraction (MNF) transformation, offers the best performance. For Sentinel-2 images, SVM with MNF achieves high user and producer accuracies and well-defined lithological boundaries. While RT and ANN also show good performance, they are slightly inferior to SVM, with RT achieving a Kappa index of 0.84 for raw Landsat 9 bands and ANN obtaining a maximum of 0.75 for Sentinel-2 data transformed with MNF. The MNF transformation generally improves SVM and ANN performance, whereas Principal Component Analysis (PCA) often produces inferior results. The robustness of SVM for high-dimensional data and its resistance to overfitting make it a promising tool for accurate lithological classification. This research has practical implications for geology and Earth sciences. The use of dimensionality reduction, particularly MNF, can greatly enhance classification quality for multispectral and hyperspectral data. These results are not only valuable for improving geological mapping, mineral exploration, and natural resource management at local and regional scales but also have significant potential for large-scale terrain analysis in diverse global contexts. The findings could support global efforts in geological hazard assessments, resource management, and environmental monitoring, particularly in regions with challenging geological settings. The study also proposes future research directions, such as exploring new dimensionality reduction techniques, evaluating classification methods with different remote sensing datasets, and integrating geophysical or geochemical data to further improve accuracy

本研究考察了三种分类算法——支持向量机（SVM）、随机树（RT）和人工神经网络（ANN）——对Landsat 9和Sentinel-2光谱数据进行岩性制图的性能。研究区域位于反阿特拉斯中部，由1:50 000的Aït Semgane地质图覆盖，具有不同的地质构造，非常适合测试先进的遥感技术。结果表明，支持向量机尤其是最小噪声分数（Minimum Noise Fraction， MNF）变换具有最好的性能。对于Sentinel-2图像，MNF支持向量机实现了较高的用户和生产者精度和明确的岩性边界。RT和ANN也表现出良好的性能，但略逊于SVM， RT对原始Landsat 9波段的Kappa指数为0.84，ANN对经过MNF变换的Sentinel-2数据的Kappa指数最高为0.75。MNF变换通常可以提高支持向量机和人工神经网络的性能，而主成分分析（PCA）的效果往往较差。支持向量机对高维数据的鲁棒性和抗过拟合性使其成为一种很有前途的精确岩性分类工具。这项研究对地质学和地球科学具有实际意义。使用降维技术，特别是MNF技术，可以极大地提高多光谱和高光谱数据的分类质量。这些结果不仅对改进地方和区域尺度的地质填图、矿产勘探和自然资源管理有价值，而且对在不同全球背景下进行大规模地形分析具有重要潜力。这些发现可以支持全球在地质灾害评估、资源管理和环境监测方面的努力，特别是在地质环境具有挑战性的地区。研究还提出了未来的研究方向，如探索新的降维技术，评估不同遥感数据集的分类方法，以及整合地球物理或地球化学数据以进一步提高精度

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引用次数: 0

Spectral–Spatial Adaptive Weighted Fusion and Residual Dense Network for hyperspectral image classification 光谱-空间自适应加权融合与残差密集网络高光谱图像分类

IF 3.7 3区地球科学 Q2 ENVIRONMENTAL SCIENCES

Egyptian Journal of Remote Sensing and Space Sciences

Pub Date : 2024-11-30 DOI: 10.1016/j.ejrs.2024.11.001

Junding Sun , Hongyuan Zhang , Xiaoxiao Ma , Ruinan Wang , Haifeng Sima , Jianlong Wang

The dense and nearly continuous spectral bands in hyperspectral images result in strong inter-band correlations, which can diminish performance of the model in classification tasks. Moreover, most convolutional neural network-based methods for hyperspectral image classification typically depend on a fixed scale to extract spectral–spatial features, which ignore the detail features of some objects. To address the above issues, a novelty Spectral Spatial Adaptive Weighted Fusion and Residual Dense Network (S

^{2}

AWF-RDN) is proposed for Hyperspectral image classification. Specifically, the proposed S

^{2}

AWF-RDN consists of spectral–spatial adaptive weighted fusion module, multi-channel feature concatenation residual dense module, and spatial feature fusion module. Firstly, the spectral information optimization branch is developed to adjust the weights assigned to various spectral channels. Similarly, the spatial information optimization branch is developed to adjust the weights for different spatial regions. Secondly, to obtain rich spectral spatial information from different levels, multi-channel feature concatenation residual dense module has been proposed. In addition, a multi-channel feature concatenation block is designed guiding the model to extract spectral spatial information at different scales. Finally, spatial feature fusion module is introduced to retain more spatial information. The experimental outcomes illustrate that the proposed network model exhibits superior classification performance on three renowned hyperspectral image datasets. Furthermore, the efficacy of the proposed network model is further corroborated through comparative and ablation studies.

高光谱图像中密集且近似连续的光谱带导致了较强的波段间相关性，从而降低了模型在分类任务中的性能。此外，大多数基于卷积神经网络的高光谱图像分类方法通常依赖于固定的尺度来提取光谱空间特征，而忽略了某些物体的细节特征。针对上述问题，提出了一种新的光谱空间自适应加权融合残差密集网络（S2AWF-RDN）用于高光谱图像分类。其中，S2AWF-RDN由频谱-空间自适应加权融合模块、多通道特征拼接残差密集模块和空间特征融合模块组成。首先，开发了光谱信息优化分支，对各光谱信道的权值进行调整；同样，开发了空间信息优化分支，以调整不同空间区域的权重。其次，为了从不同层次获取丰富的光谱空间信息，提出了多通道特征拼接残差密集模块；此外，设计了多通道特征拼接块，引导模型提取不同尺度的光谱空间信息。最后，引入空间特征融合模块，保留更多的空间信息。实验结果表明，所提出的网络模型在三个著名的高光谱图像数据集上表现出优异的分类性能。此外，通过对比和消融研究进一步证实了所提出的网络模型的有效性。

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引用次数: 0

New radio-seismic indicator for ELF seismic precursors detectability 低频地震前兆可探测性的新无线电地震指标

IF 3.7 3区地球科学 Q2 ENVIRONMENTAL SCIENCES

Egyptian Journal of Remote Sensing and Space Sciences

Pub Date : 2024-11-29 DOI: 10.1016/j.ejrs.2024.10.003

Andrea Mariscotti , Renato Romero

This work considers the effectiveness of earthquakes (EQs) radio precursors mainly in the Extremely Low Frequency (ELF) range and below, and carries out an analysis based on a comprehensive set of EQ events documented in past publications and provided by the Opera 2015 project (six stations located in Italy). A new Radio-Seismic Indicator (RSI) is proposed, with the magnitude-distance relationship physically justified by path-loss expressions of the transverse magnetic mode. Classification performances of past and proposed RSIs are assessed calculating confusion matrices and on those the balanced accuracy and Matthews’ coefficient: the RSI performs significantly better reducing fall-outs and increasing precision for both classes, positive and negative precursors. Performance improvement is inherently limited by the overlap of the classes.

这项工作考虑了地震（EQ）无线电前兆的有效性，主要是在极低频（ELF）及以下范围内，并根据Opera 2015项目（位于意大利的六个站点）提供的过去出版物中记录的一套全面的EQ事件进行了分析。提出了一种新的无线电地震指示器（RSI），用横向磁模的路径损耗表达式物理地证明了震级-距离关系。通过计算混淆矩阵来评估过去和提议的RSI的分类性能，并在这些矩阵上平衡精度和马修斯系数：RSI对两类，正前体和负前体都表现出更好的减少辐射和提高精度。性能改进本质上受到类重叠的限制。

引用次数: 0

Estimation of above ground biomass of mangrove forest plot using terrestrial laser scanner 利用陆地激光扫描仪估算红树林地块的地上生物量

IF 3.7 3区地球科学 Q2 ENVIRONMENTAL SCIENCES

Egyptian Journal of Remote Sensing and Space Sciences

Pub Date : 2024-11-23 DOI: 10.1016/j.ejrs.2024.11.002

Yeshwanth Kumar Adimoolam , Nithin D. Pillai , Gnanappazham Lakshmanan , Deepak Mishra , Vinay Kumar Dadhwal

Above-Ground Biomass (AGB) is an important parameter in the conservation of mangrove ecosystem owing to their ecological and economic benefits. LiDAR technologies in forest studies have become popular, due to its highly accurate 3D spatial data acquisition. In this study, we propose an end-to-end framework for estimating AGB of mangroves from Terrestrial Laser Scanner (TLS) point clouds. The framework includes pre-processing of data, segmenting the wood and foliage at tree level using Weighted Random Forest (WRF) classifier and constructing Quantitative Structure Model (QSM) of the wooden components to estimate its biomass. The flow was extended to AGB estimation of 33 x 33 m plot by integrating tree level framework. The study also finds a unique solution to estimate the contribution of pneumatophores in the AGB. Segmentation of wood/foliage of tree point cloud using WRF yielded better results with an increment of 15.27 % in Balanced accuracy, 0.2 of Cohen’s Kappa coefficient, and 7.45 % in F1score than RF classifier. AGB estimation of mangroves using our approach using TLS data is 47.54 T/ha which has a mean bias of 0.0044 T/ha and RMS variation of 0.026 T/ ha when compared with the allometric methods. A Breadth-first graph-search segmentation approach was used to count the pneumatophores, aerial roots seen in few mangrove species (R² = 0.94 with manual counting) and estimate its contribution to AGB of mangroves which is first of its kind using TLS point cloud. This outcome could also aid future studies in modeling the underlying root network and estimating the below-ground biomass.

由于红树林的生态和经济效益，地上生物量（AGB）是保护红树林生态系统的一个重要参数。由于能获取高精度的三维空间数据，激光雷达技术在森林研究中得到了广泛应用。在本研究中，我们提出了一个端到端框架，用于从地面激光扫描仪（TLS）点云估算红树林的 AGB。该框架包括数据预处理、使用加权随机森林（WRF）分类器分割树木层面的木质和叶片，以及构建木质成分的定量结构模型（QSM）以估算其生物量。通过整合树级框架，该流程扩展到 33 x 33 米地块的 AGB 估算。该研究还找到了一个独特的解决方案来估算气生植物在 AGB 中的贡献。与射频分类器相比，使用 WRF 对树木点云的木材/叶片进行分类的结果更好，平衡精度提高了 15.27%，科恩卡帕系数提高了 0.2，F1 分数提高了 7.45%。利用 TLS 数据，采用我们的方法估算出的红树林 AGB 为 47.54 吨/公顷，与其他计量方法相比，平均偏差为 0.0044 吨/公顷，均方根变异为 0.026 吨/公顷。利用广度优先图搜索分割方法计算了少数红树林物种的气生根（人工计算的 R2 = 0.94），并估算了其对红树林 AGB 的贡献，这是首次利用 TLS 点云进行此类估算。这一结果也有助于今后的研究建立底层根系网络模型和估算地下生物量。

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