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Weed classification in sugarcane fields in Northeast Thailand from multi-temporal Sentinel-1 and Sentinel-2 data together with random forest algorithm 基于Sentinel-1和Sentinel-2数据的泰国东北部甘蔗田杂草分类研究
IF 5.2 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2025-12-09 DOI: 10.1016/j.srs.2025.100352
Savittri Ratanopad Suwanlee , Muhammad Hanif , Kemin Kasa , Surasak Keawsomsee , Jaturong Som-ard , Vorraveerukorn Veerachitt , Phattamon Heawchaiyaphum , Akkawat Puntura , Mohammad D. Hossain , Sarawut Ninsawat
Timely and accurate weed detection is essential for sustainable crop production and management. The integration of multiple satellite data sources with powerful machine learning has transformed precision agriculture by enhancing the accuracy and automation of object classification, enabling large-scale analysis and real-time predictions. However, challenges remain in effectively managing agricultural practices, particularly in weed control. This study employed Sentinel-1 (S1) and Sentinel-2 (S2) satellite data, combined with vegetation indices and random forest (RF) classification algorithm, to map weed presence in sugarcane fields in Northeastern Thailand. The large number of reference data consisting of 744 points was utilized to train and validate weed identification. The combined S1 and S2 dataset significantly enhanced the detection capabilities of the best RF model, achieving an overall classification result of 96 % accuracy and F1 scores exceeding 93 %. While overall weed levels were low, several high-density zones were clearly detected, underscoring the importance of targeted weed management. The combination of S1 and S2 data improved classification performance, addressing challenges posed by mixed pixels in small fields. Stratifying weed density provided deeper insights into field variability over the large scale. Our work presents a scientifically robust and operationally scalable framework for monitoring weed infestations in sugarcane cultivation. The proposed approach demonstrates strong potential for advancing sustainable precision agriculture by facilitating timely and spatially precise interventions.
及时准确的杂草检测对作物的可持续生产和管理至关重要。将多个卫星数据源与强大的机器学习相结合,通过提高目标分类的准确性和自动化,实现大规模分析和实时预测,改变了精准农业。然而,在有效管理农业实践方面,特别是在杂草控制方面,仍然存在挑战。本研究利用Sentinel-1 (S1)和Sentinel-2 (S2)卫星数据,结合植被指数和随机森林(RF)分类算法,绘制了泰国东北部甘蔗田杂草分布图。利用744个点的大量参考数据对杂草识别进行训练和验证。结合S1和S2数据集显著增强了最佳RF模型的检测能力,总体分类结果准确率达到96%,F1得分超过93%。虽然总体杂草水平较低,但清楚地发现了几个高密度区,强调了有针对性的杂草管理的重要性。S1和S2数据的结合提高了分类性能,解决了小域内混合像素带来的挑战。对杂草密度进行分层可以更深入地了解大规模的田间变异性。我们的工作提出了一个科学可靠和可扩展的框架,用于监测甘蔗种植中的杂草侵害。所提出的方法通过促进及时和空间上精确的干预,显示了推进可持续精准农业的巨大潜力。
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引用次数: 0
The rayleigh effects on the atmospheric correction of the ultraviolet imager on HY-1C and HY-1D satellites HY-1C和HY-1D卫星紫外成像仪大气校正的瑞利效应
IF 5.2 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2025-12-08 DOI: 10.1016/j.srs.2025.100349
Zhihua Mao , Xianliang Zhang , Dayi Yin , Longwei Zhang , Yiwei Zhang , Qifei Wang , Bangyi Tao , Jianyu Chen , Zengzhou Hao , Qiankun Zhu , Haiqing Huang
Ultraviolet (UV) light is a key component of solar radiation, significantly impacting marine ecosystems. It is necessary to measure the ultraviolet light on the ocean which is now available from the Ultraviolet Imager (UVI) on the two ocean color satellites (HY-1C and HY-1D). The atmospheric correction (AC) procedure of the UVI data is based on the Layer Removal Scheme for Atmospheric Correction (LRSAC). Evaluation with Marine Optical Buoy in-situ data shows water-leaving reflectance (Rrs) accuracy with mean relative error (MRE) of 0.84 % (high sensitivity) and 0.13 % (low sensitivity) at Band 1 of HY-1C, and 6.79 % (high sensitivity) and −5.55 % (low sensitivity) at Band 2 of HY-1C, respectively. The mean absolute error (MAE) values are 0.0023 sr−1 (high sensitivity) and 0.0034 sr−1 (low sensitivity) at Band 1 of HY-1C, and 0.0021 sr−1 (high sensitivity) and −0.0028 sr−1 (low sensitivity) at Band 2 of HY-1C, respectively. The MRE values are 13.96 % (high sensitivity) and 20.27 % (low sensitivity) at Band 1 of HY-1D, and 8.09 % (high sensitivity) and 6.99 % (low sensitivity) at Band 2 of HY-1D, respectively. The MAE values are 0.0021 sr−1 (high sensitivity) and 0.0022 sr−1 (low sensitivity) at Band 1 of HY-1D, and 0.0023 sr−1 (high sensitivity) and 0.0022 sr−1 (low sensitivity) at Band 2 of HY-1D, respectively. The global daily and the 8-day composite images of the UVI demonstrate the spatial patterns of Rrs in the ultraviolet region, similar to the Rrs products of the Chinese Ocean Color and Temperature Scanner at blue bands. The accuracy of the Rayleigh can affect the performance of the AC mainly due to the largest part in the satellite-received radiance of the UVI. The selection of different volume scattering phases can cause about 1 % of MRE in the generation of the lookup table of Rayleigh varying with the solar and viewing angles. The ozone concentrations, sea surface winds, and atmospheric pressure of the global daily climatology have been generated and used to estimate the Rayleigh scattering at the ultraviolet bands. The ozone concentrations can cause about −0.6 % of MRE with about −0.8 % for winds and −0.4 % for pressure on the global Rayleigh distributions. The products are now available on the website for the oceanography study.
紫外线是太阳辐射的重要组成部分,对海洋生态系统有重要影响。有必要测量海洋上的紫外线,目前可以从两颗海洋彩色卫星(HY-1C和HY-1D)上的紫外线成像仪(UVI)获得。UVI数据的大气校正(AC)过程基于大气校正的分层去除方案(LRSAC)。利用海洋光学浮标原位数据进行评价,在HY-1C波段1的平均相对误差(MRE)分别为0.84%(高灵敏度)和0.13%(低灵敏度),在HY-1C波段2的平均相对误差分别为6.79%(高灵敏度)和- 5.55%(低灵敏度)。在HY-1C波段1的平均绝对误差(MAE)分别为0.0023 sr−1(高灵敏度)和0.0034 sr−1(低灵敏度),在HY-1C波段2的平均绝对误差(MAE)分别为0.0021 sr−1(高灵敏度)和- 0.0028 sr−1(低灵敏度)。在HY-1D波段1的MRE值分别为13.96%(高灵敏度)和20.27%(低灵敏度),在HY-1D波段2的MRE值分别为8.09%(高灵敏度)和6.99%(低灵敏度)。在HY-1D波段1的MAE值分别为0.0021 sr−1(高灵敏度)和0.0022 sr−1(低灵敏度),在HY-1D波段2的MAE值分别为0.0023 sr−1(高灵敏度)和0.0022 sr−1(低灵敏度)。全球日和8天的UVI合成图像显示了紫外线区域Rrs的空间格局,与中国海洋颜色和温度扫描仪在蓝色波段的Rrs产品相似。瑞利雷达的精度会影响交流雷达的性能,主要是因为卫星接收到的紫外线辐射占最大的比例。在瑞利查找表的生成过程中,不同体积散射相位的选择会导致约1%的MRE随太阳和视角的变化而变化。生成了全球日气候学的臭氧浓度、海面风和大气压力,并用于估算紫外线波段的瑞利散射。在全球瑞利分布上,臭氧浓度可引起约- 0.6%的MRE,约- 0.8%的风和- 0.4%的压力。这些产品现在可以在海洋学研究网站上找到。
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引用次数: 0
Satellite remote sensing and field analyses of megaripples and dunes in the Skeleton Coast National Park, Namibia 纳米比亚骷髅海岸国家公园的巨型水坑和沙丘的卫星遥感和野外分析
IF 5.2 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2025-12-04 DOI: 10.1016/j.srs.2025.100347
A.L. Cohen-Zada , D.A. Vaz , I. Katra , L. Berger , L. Saban , S. Silvestro , H. Yizhaq
The morphology of aeolian bedforms is controlled by the boundary conditions during their formation and evolution, playing a crucial role in reconstructing current and past environmental settings. This study investigates the morphology and dynamics of multiscale aeolian bedforms, specifically megaripples and barchan dunes, in Namibia's Skeleton Coast National Park using satellite remote sensing, reanalysis wind data, and field observations. Newly mapped megaripples show average wavelengths between 3.3 and 4.4 m, with crest orientations aligned predominantly with regional southerly winds. Remote sensing data reveal a dune migration rate of ∼30 m yr−1 and an average sand flux of ∼140 m3 m−1 yr−1, while field-based storm observations yield a peak flux of 256 m3 m−1 yr−1. A novel correlation between armoring layer thickness and grain-size median (D50) suggests a feedback loop where larger grains promote ripple growth. Seasonal wind shifts inferred from dune patterns and wind streaks are corroborated by ERA5 reanalysis, indicating a dynamic yet low-energy aeolian system. The results provide insights into sediment transport mechanisms across scales, the evolution of ripple morphometry, and grain-size feedbacks influencing megaripple formation, offering valuable analogs for similar processes on Mars. This multiscale assessment supports improved modeling of terrestrial and planetary aeolian systems.
风成地貌的形态在其形成和演化过程中受边界条件的控制,在重建当前和过去的环境条件中起着至关重要的作用。本研究利用卫星遥感、再分析风数据和野外观测,研究了纳米比亚骷髅海岸国家公园多尺度风成地貌的形态和动力学,特别是巨波纹和barchan沙丘。新绘制的巨虹点显示平均波长在3.3到4.4米之间,其波峰方向主要与区域南风对齐。遥感资料显示,沙丘迁移速率为~ 30 m yr - 1,平均沙通量为~ 140 m3 m - 1 yr - 1,而野外风暴观测的峰值通量为256 m3 m - 1 yr - 1。装甲层厚度和晶粒尺寸中值(D50)之间的新相关性表明,一个反馈回路,其中较大的晶粒促进波纹生长。ERA5再分析证实了从沙丘型态和风条推断出的季节风移,表明这是一个动态的低能风成系统。研究结果提供了对沉积物跨尺度运输机制、波纹形态的演变以及影响巨波纹形成的粒度反馈的见解,为火星上的类似过程提供了有价值的类似物。这种多尺度评估支持改进陆地和行星风成系统的模拟。
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引用次数: 0
A frequency-based approach to improve the geometric accuracy of FY4B/AGRI geostationary satellite observations 基于频率的FY4B/AGRI对地静止卫星观测几何精度提高方法
IF 5.2 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2025-12-04 DOI: 10.1016/j.srs.2025.100348
Zhenduo Deng , Xuanlong Ma
The Advanced Geostationary Radiation Imager (AGRI) onboard the FengYun-4B (FY4B) satellite—a new-generation geostationary (GEO) platform—offers spatial and radiometric resolutions comparable to those of polar-orbiting satellites such as EOS-MODIS, but with substantially higher temporal resolution. This enhanced temporal capability expands the potential of GEO observations beyond meteorology into terrestrial sciences. Precise geometric accuracy is essential for quantitative remote sensing, as the reliability of any downstream retrieval algorithm depends on accurate geolocation. Operational correction of geometric errors is challenging due to the scarcity of ground control points and large data volumes. Here, we evaluated the geolocation accuracy of FY4B/AGRI imagery using a full year of data and developed an integrated geometric correction workflow combining the Phase-Only Correlation method based on Fast Fourier Transform (FFT-POC) with a ray-tracing orthorectification process. In the original imagery, significant geometric instabilities were observed: east-west offsets (COFF) frequently fluctuated between ±5 and ± 10 pixels (reaching ±15 pixels) due to diurnal thermal deformation and operational maneuvers, whereas north-south offsets (LOFF) remained comparatively stable within ±5 pixels. These systematic errors were fully corrected by the FFT-POC step, while the subsequent orthorectification effectively eliminated terrain-induced parallax distortions exceeding 3 pixels in high-altitude regions. The corrected FY4B/AGRI data offers accurate geolocation to support operational hyper-temporal applications such as disaster monitoring and carbon cycle sciences.
搭载在风云- 4b (FY4B)卫星上的先进地球静止辐射成像仪(AGRI)——一种新一代地球静止(GEO)平台——提供与极轨卫星(如EOS-MODIS)相当的空间和辐射分辨率,但具有实质上更高的时间分辨率。这种增强的时间能力将地球同步轨道观测的潜力从气象学扩展到陆地科学。精确的几何精度对于定量遥感至关重要,因为任何下游检索算法的可靠性都取决于精确的地理定位。由于地面控制点稀缺和数据量大,几何误差的操作校正具有挑战性。在此,我们利用一整年的数据评估FY4B/AGRI图像的地理定位精度,并开发了一种将基于快速傅里叶变换(FFT-POC)的纯相位相关方法与光线追踪正校正过程相结合的综合几何校正工作流程。在原始图像中,观察到显著的几何不稳定性:由于日热变形和操作机动,东西偏移量(COFF)经常在±5到±10像素之间波动(达到±15像素),而南北偏移量(LOFF)在±5像素内保持相对稳定。这些系统误差被FFT-POC步骤完全纠正,而随后的正校正有效地消除了地形引起的视差扭曲,在高海拔地区超过3像素。修正后的FY4B/AGRI数据提供了准确的地理定位,以支持灾害监测和碳循环科学等业务超时间应用。
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引用次数: 0
High-resolution maize yield mapping across Africa using earth observation and machine learning, deep learning, and foundation model 利用地球观测、机器学习、深度学习和基础模型绘制全非洲高分辨率玉米产量地图
IF 5.2 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2025-12-03 DOI: 10.1016/j.srs.2025.100344
Krishnagopal Halder , Frank Ewert , Anitabha Ghosh , Kaushik Muduchuru , Lily-belle Sweet , Radwa Elshawi , Jan Timko , Wenhi Zheng , Karam Alsafadi , Gang Zhao , Michael Maerker , Manmeet Singh , Lei Guoging , Thomas Gaiser , Dominik Behrend , Yue Shi , Liangxiu Han , Masahiro Ryo , Amit Kumar Srivastava
Africa's food security is increasingly threatened by climate change and population growth, creating an urgent need for high-resolution crop yield maps to support precision agriculture and climate adaptation; however, much of the continent remains poorly monitored due to limited ground observations. This study introduces a novel 250-m spatial resolution maize yield prediction framework for 42 African countries. Our methodology utilizes Net Primary Production (NPP) data to spatially disaggregate national FAO yield statistics, generating fine-scale training data for supervised learning. A comprehensive feature set of 296 variables was constructed by integrating multi-source Earth observation, climate, and soil data. We evaluated multiple benchmark models for tabular data, including XGBoost, LightGBM, a Hybrid Deep Neural Network (HDNN), and, for the first time in this context, a tabular foundation model, the Tabular Prior data Fitted Network (TabPFN). Using an expanding-window temporal cross-validation strategy, XGBoost achieved the highest temporal R2 (0.78), while TabPFN demonstrated superior spatial generalization and the lowest mean absolute percentage error (MAPE ≈ 25 %). Causal inference and ablation analyses highlighted the predictive importance of vegetation indices (e.g., NDVI, NDWI), drought metrics, and soil properties. Model outputs closely matched national yields (R2 > 0.75; MAPE ≈ 26–28 %). This study provides a scalable framework for yield monitoring in data-scarce regions and represents the first successful application of tabular foundation models in continental-scale agricultural prediction.
非洲的粮食安全日益受到气候变化和人口增长的威胁,迫切需要高分辨率作物产量地图,以支持精准农业和气候适应;然而,由于地面观测有限,非洲大陆的大部分地区仍然监测不足。本研究为42个非洲国家引入了一个新的250米空间分辨率玉米产量预测框架。我们的方法利用净初级生产(NPP)数据对粮农组织国家产量统计数据进行空间分解,生成用于监督学习的精细训练数据。综合多源对地观测、气候和土壤数据,构建了296个变量的综合特征集。我们评估了表格数据的多个基准模型,包括XGBoost, LightGBM,混合深度神经网络(HDNN),以及在此背景下首次使用的表格基础模型,表格先验数据拟合网络(TabPFN)。使用扩展窗口时间交叉验证策略,XGBoost获得了最高的时间R2(0.78),而TabPFN表现出更好的空间泛化和最低的平均绝对百分比误差(MAPE≈25%)。因果推理和消融分析强调了植被指数(如NDVI、NDWI)、干旱指标和土壤特性的预测重要性。模型产出与国家产量密切匹配(R2 > 0.75; MAPE≈26 - 28%)。该研究为数据稀缺地区的产量监测提供了一个可扩展的框架,并代表了表格基础模型在大陆尺度农业预测中的首次成功应用。
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引用次数: 0
Improved hybrid algorithm for land surface temperature retrieval from Chinese GF-5B satellite 中国GF-5B卫星地表温度反演的改进混合算法
IF 5.2 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2025-12-02 DOI: 10.1016/j.srs.2025.100343
Zhengyu Shen , Honglian Huang , Xiao Liu , Rufang Ti , Xiaobing Sun , Qidong Chen
Land surface temperature (LST) is a key parameter in understanding surface–atmosphere energy exchanges. Conventional temperature and emissivity separation (TES) and split-window (SW) algorithms often suffer from limited accuracy when applied to surfaces with strong spectral contrast or complex atmospheric conditions. To overcome these issues, this study proposes a Maximum Emissivity Approximation OSTES (MEAOSTES) algorithm that integrates the generalized radiance-based split-window (GRSW) model with the optimized smoothing for temperature and emissivity separation (OSTES) framework. The MEAOSTES introduces a maximum-emissivity adjustment and iterative rollback mechanism to enhance the coupling between LST and emissivity retrievals. Furthermore, in this paper, the SW-TES algorithm is extended to the SW-OSTES algorithm, and the retrieval accuracy of different combination schemes of the SW and OSTES algorithms is discussed. Using data from the GF-5B satellite, which provides four thermal infrared channels at 40 m spatial resolution, the algorithms’ performance were evaluated against simulated datasets, in-situ measurements, and the MODIS MOD21 LST product. The results show that the MEAOSTES achieves the best overall accuracy, root-mean-square errors (RMSEs) of 0.92 K and 1.77 K for simulation and in-situ validation, outperforming both the OSTES and SW-OSTES approaches. The proposed algorithm effectively reduces sensitivity to atmospheric parameters and maintains consistent performance across surfaces with varying spectral contrast. These improvements demonstrate the robustness of MEAOSTES for high-resolution LST retrieval and provide insights for future hybrid algorithm development.
地表温度(LST)是了解地表-大气能量交换的关键参数。传统的温度和发射率分离(TES)和分窗(SW)算法在应用于具有强光谱对比度或复杂大气条件的表面时,精度往往有限。为了克服这些问题,本研究提出了一种最大发射率近似OSTES (MEAOSTES)算法,该算法将基于广义辐射的分窗(GRSW)模型与温度和发射率分离(OSTES)框架的优化平滑相结合。MEAOSTES引入了最大发射率调整和迭代回滚机制,以增强地表温度和发射率检索之间的耦合。在此基础上,本文将SW- tes算法扩展到SW-OSTES算法,讨论了SW和OSTES算法不同组合方案的检索精度。利用GF-5B卫星提供的4个40米空间分辨率的热红外通道数据,通过模拟数据集、现场测量和MODIS MOD21 LST产品对算法的性能进行了评估。结果表明,MEAOSTES方法总体精度最高,模拟和原位验证的均方根误差(rmse)分别为0.92 K和1.77 K,优于OSTES和SW-OSTES方法。该算法有效地降低了对大气参数的敏感性,并在不同光谱对比度的表面上保持一致的性能。这些改进证明了MEAOSTES在高分辨率LST检索方面的鲁棒性,并为未来混合算法的开发提供了见解。
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引用次数: 0
Combining single-date mobile and multitemporal airborne laser scanning for retrospective estimation of individual tree growth over a 10-year period in boreal forests 结合单日期移动和多时相机载激光扫描对北方森林单株树木生长10年的回顾性估计
IF 5.2 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2025-12-02 DOI: 10.1016/j.srs.2025.100345
Daniella Tavi , Jesse Muhojoki , Valtteri Soininen , Eric Hyyppä , Teemu Hakala , Ville Luoma , Antero Kukko , Xiaowei Yu , Mikko Vastaranta , Juha Hyyppä
Accurate estimation of individual tree growth is essential for forest inventories and carbon stock assessments, yet traditional manual methods remain labor-intensive and poorly scalable. Laser scanning offers promising alternatives, but slow tree growth rates, sensor limitations, and limited temporal availability of accurate stem-level data challenge growth estimation. This study presents a novel framework combining a single-date mobile laser scanning (MLS) dataset from 2024 with airborne laser scanning (ALS) datasets from 2014 and 2023 to estimate 10-year growth (2014–2024) in diameter at breast height (DBH) and stem volume at the individual tree level. MLS was used for detecting trees and modeling their stem curves, enabling DBH estimation in 2024. These stem curves, alongside ALS-derived heights, were used for volume estimation in 2024. A linear scaling approach, based on ALS-derived height growth factors, was used to model past DBH and stem curves to obtain 2014 attributes, eliminating the need for historical MLS data. Across eight boreal forest plots, growth and one-time attribute estimation accuracy were evaluated against manual DBH measurements and ALS-based reference heights, with analyses across forest complexities, tree species, and size classes. Volume change estimation achieved R2 values of 0.6–0.8 compared to 0.3–0.4 for DBH change estimation. Root mean square errors (RMSEs) were 0.9–1.7 cm (30%–64%) for DBH change and 0.04–0.10 m3 (25%–65%) for volume change. Growth estimation was most accurate for pines, medium-sized trees (DBH 20–35 cm), and in sparse stands. Although accuracy varied by environment, the proposed method offers a scalable approach for retrospective growth estimation, with potential to enhance the efficiency and cost-effectiveness of forest monitoring.
准确估计单株树木的生长对森林资源清查和碳储量评估至关重要,但传统的人工方法仍然是劳动密集型的,而且难以推广。激光扫描提供了很有希望的替代方法,但树木生长速度慢,传感器的局限性,以及准确的茎级数据的有限时间可用性,给生长估计带来了挑战。本研究提出了一个新的框架,将2024年的单日期移动激光扫描(MLS)数据集与2014年和2023年的机载激光扫描(ALS)数据集相结合,以估计10年(2014 - 2024年)树木胸高直径(DBH)和单树水平茎体积的增长。MLS用于树木检测和树干曲线建模,实现了2024年的胸径估计。这些茎杆曲线与als导出的高度一起用于2024年的体积估计。基于als衍生的高度生长因子,采用线性缩放方法对过去的胸径和茎干曲线进行建模,以获得2014年的属性,从而消除了对历史MLS数据的需求。在8个北方针叶林样地,利用人工胸径测量和基于als的参考高度对生长和一次性属性估计的准确性进行了评估,并对森林复杂性、树种和大小类别进行了分析。体积变化估计的R2值为0.6-0.8,而胸径变化估计的R2值为0.3-0.4。胸径变化的均方根误差(rmse)为0.9 ~ 1.7 cm(30% ~ 64%),体积变化的均方根误差为0.04 ~ 0.10 m3(25% ~ 65%)。对松木、中等乔木(胸径20 ~ 35 cm)和稀疏林分的生长估算最准确。虽然准确性因环境而异,但提议的方法提供了一种可扩展的回顾性生长估计方法,有可能提高森林监测的效率和成本效益。
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引用次数: 0
Corrigendum to “Transferability of country-wide airborne laser scanning-based models for individual-tree attributes” [Sci. Rem. Sens. 12 (2025) 100310] “基于单个树属性的全国机载激光扫描模型的可移植性”的勘误表[Sci]。[j] .上院学报,12(2025)100310。
IF 5.2 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2025-12-01 DOI: 10.1016/j.srs.2025.100329
Valtteri Soininen, Xiaowei Yu, Matti Hyyppä, Juha Hyyppä
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引用次数: 0
Response of the Sentinel-1 radar backscattering to an extreme wildfire event: surface soil moisture and vegetation cover implications Sentinel-1雷达后向散射对极端野火事件的响应:地表土壤湿度和植被覆盖的影响
IF 5.2 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2025-12-01 DOI: 10.1016/j.srs.2025.100339
Giuseppe Esposito , Massimo Melillo , Davide Notti , Maria Teresa Brunetti , Silvia Peruccacci , Luca Pisano , Luca Brocca , Rosa Maria Cavalli
Extreme wildfire events affecting rugged landscapes may pose necessary conditions for the initiation of cascading rainfall-triggered hazards, such as soil erosion, landslides, debris flows and floods. In particular, severe vegetation damage and modification of soil hydraulic properties are among the primary effects of wildfires influencing the post-fire hazards, as documented in many settings worldwide. In this work, we have analyzed the Sentinel-1 SAR backscattering changes before and after an extreme wildfire occurred in Italy, in areas covered by low-lying vegetation, to investigate how VH and VV coefficients relate with vegetation and surface soil moisture behaviors. For this purpose, SAR data have been coupled with NDVI and NDWI indices retrieved from Sentinel-2 imagery, as well as with time series of rainfall and surface soil moisture estimated at plot scale. The most significant findings reveal that the selected burned areas exhibit higher VV backscattering values after the first post-fire intense rainfall, compared to pre-fire conditions. This anomaly depends on the exceptional availability of water in the topsoil, suggesting a reduced vegetation interception together with a likely reduction of the soil infiltration capacity. The lowest VH backscattering values in the period immediately after the fire highlight the vegetation consumption. Nearly one year after the analyzed wildfire, both vegetation and soil conditions appear to have recovered to pre-fire levels. This study demonstrates the potentiality of integrating SAR and optical data to effectively monitor landscapes affected by wildfires. Future research should aim to combine this kind of data with hydrological models to improve post-fire risk mitigation strategies.
影响崎岖地貌的极端野火事件可能为引发由降雨引发的级联灾害(如水土流失、山体滑坡、泥石流和洪水)创造必要条件。特别是,严重的植被破坏和土壤水力特性的改变是影响火灾后危害的野火的主要影响之一,这在世界各地的许多环境中都有记录。在这项工作中,我们分析了在意大利低洼植被覆盖的地区发生极端野火前后的Sentinel-1 SAR后向散射变化,以研究VH和VV系数与植被和表层土壤水分行为的关系。为此,我们将SAR数据与从Sentinel-2图像中检索的NDVI和NDWI指数,以及在地块尺度估计的降雨和地表土壤湿度时间序列相结合。最重要的发现是,与火灾前相比,选定的烧伤区域在火灾后第一次强降雨后表现出更高的VV后向散射值。这种异常取决于表土中水分的异常可用性,这表明植被截留减少,土壤入渗能力也可能减少。火灾后一段时间内VH后向散射值最低,反映了植被的消耗情况。在分析野火近一年后,植被和土壤条件似乎已经恢复到火灾前的水平。该研究证明了整合SAR和光学数据以有效监测受野火影响的景观的潜力。未来的研究应该致力于将这类数据与水文模型结合起来,以改进火灾后风险缓解策略。
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引用次数: 0
Corrigendum to “Investigating the contribution of understory to radiative transfer simulations through reconstructing 3-D realistic temperate broadleaf forest scenes based on multi-platform laser scanning” [Sci. Rem. Sens. 11 (2025) 100196] “基于多平台激光扫描重建三维真实温带阔叶林场景,研究林下植被对辐射传输模拟的贡献”的勘误[Sci]。[r] .参议院,11 (2025)100196]
IF 5.2 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2025-12-01 DOI: 10.1016/j.srs.2025.100211
Xiaohan Lin , Ainong Li , Jinhu Bian , Zhengjian Zhang , Xi Nan , Limin Chen , Yi Bai , Yi Deng , Siyuan Li
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Science of Remote Sensing
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