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Retrieval of forest canopy height in a mountainous region with ICESat-2 ATLAS

Forest Ecosystems 2022年第4期9卷 491-502页

作者： Shiyun Pang Guiying Li Xiandie Jiang Yaoliang Chen yagang lu Dengsheng lu State Key Laboratory for Subtropical Mountain Ecology of the Ministry of Science and Technology and Fujian Province Fujian Normal UniversityFuzhou350007China Institute of Geography Fujian Normal UniversityFuzhou350007China Institute of East China Inventory and Planning National Forestry and Grassland AdministrationHangzhou310019China

Forest canopy height is one of the important forest parameters for accurately assessing forest biomass or carbon sequestration. ICESat-2 ATLAS provides the potential for retrieval of forest canopy height at global or regional scale, but the current canopy height product (ATL08) has coarse resolution and high uncertainty compared to airborne LiDAR-derived canopy height (hereafter ALCH) in mountainous regions, and is not ready for such applications as biomass modeling at finer scale. The objective of this research was to explore the approach to accurately retrieve canopy height from ATLAS data by incorporating an airborne-derived digital terrain model(DTM) and a data-filtering strategy. By linking ATLAS ATL03 with ATL08 products, the geospatial locations,types, and (absolute) heights of photons were obtained, and canopy heights at different lengths (from 20 to 200 m at 20-m intervals) of segments along a track were computed with the aid of airborne LiDAR DTM. Based on the relationship between the numbers of canopy photons within the segments and accuracy of ATLAS mean canopy height compared to ALCH, a filtering method for excluding a certain portion of unreliable segments was *** method was further applied to different ATLAS ground tracks for retrieval of canopy heights and the results were evaluated using corresponding ALCH. The results show that the incorporation of high-precision DTM and ATLAS products can considerably improve the retrieval accuracy of forest canopy height in mountainous *** the proposed filtering approach, the correlation coefficients (r) between ATLAS canopy height and corresponding ALCH were 0.61–0.91, 0.65–0.92, 0.68–0.94 for segment lengths of 20, 60, and 100 m, respectively;RMSE were 1.90–4.35, 1.55–3.63, and 1.34–3.23 m for the same segment lengths. The results indicate the necessity of using high-precision DTM and using the proposed filtering method to retrieve accurate canopy height from ICESat-2 ATLAS in mountainous re

关键词： Airborne LiDAR Canopy height ICESat-2 ATLAS Mountainous region Segment filtering

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协同多源遥感数据的北亚热带森林蓄积量贝叶斯分层估测

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遥感学报 2022年第3期26卷 468-479页

作者：林文科陆亚刚蒋先蝶李桂英李登秋陆灯盛福建师范大学湿润亚热带山地生态国家重点实验室培育基地福州350007 福建师范大学地理研究所福州350007 国家林业和草原局华东调查规划设计院杭州310000 福建省减灾中心福州350001

精确估算森林蓄积量是国家实现2060年前碳中和目标的迫切需求,而基于遥感的森林蓄积量定量反演是当前遥感应用领域面临的重要挑战和研究热点。光学遥感数据由于无法获取森林高度信息并存在信号饱和问题,反演森林蓄积量的精度较低,而机载... 详细信息

精确估算森林蓄积量是国家实现2060年前碳中和目标的迫切需求,而基于遥感的森林蓄积量定量反演是当前遥感应用领域面临的重要挑战和研究热点。光学遥感数据由于无法获取森林高度信息并存在信号饱和问题,反演森林蓄积量的精度较低,而机载Lidar数据能获取高度信息,但成本高、观测范围有限。本研究利用Sentinel-2多光谱、资源三号立体成像和机载Lidar数据,定量评价多源遥感数据在北亚热带估测森林蓄积量的能力,并探索小样本情况下贝叶斯模型在森林蓄积量估算中的优势,旨在解决单一数据集估测森林蓄积量精度低和样本数量不足的问题。研究结果表明,协同Sentinel-2和林分冠层高度模型(CHM)数据的贝叶斯分层建模能够显著提高森林蓄积量估测精度,其相对均方根误差(rRMSE)为27.6%,其估测误差比Sentinel-2数据减少了13.6 m^(3)/ha,比单独CHM数据减少了7.4 m^(3)/ha。多源数据可以有效改善低值高估和高值低估问题,相比单一数据集,多源数据在低值区估测误差减少了约1/4,在高值区减少了约1/3。分层贝叶斯模型有效缓解了因精细分层对样本数量的需求,减少了森林类型和地形差异对森林蓄积量估测精度的影响。为亚热带森林类型和地形复杂的地区,开展森林蓄积量估测制图提供关键技术手段。

关键词：遥感森林蓄积量贝叶斯分层模型 Sentinel-2 资源三号机载Lidar 多源数据

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基于随机森林分类模型填补森林资源连续清查缺失因子

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生态学报 2024年第18期44卷 8269-8282页

作者：周婷徐含乐徐奇刚朱本挥陆亚刚浙江大学环境与资源学院杭州310058 国家林业和草原局华东调查规划院杭州310019

森林资源连续清查是评估林业生态建设成效和制定发展战略的重要依据。然而,由于监测体系和不同时期需求的升级,清查数据存在调查因子不连贯的问题。基于华东地区六省一市第六期至第九期清查数据,根据五个林分结构缺失因子和不同因子之... 详细信息

森林资源连续清查是评估林业生态建设成效和制定发展战略的重要依据。然而,由于监测体系和不同时期需求的升级,清查数据存在调查因子不连贯的问题。基于华东地区六省一市第六期至第九期清查数据,根据五个林分结构缺失因子和不同因子之间的相关性选取特征因子,采用随机森林分类模型填补缺失因子并分析特征因子的重要性。结果显示:(1)缺失因子和当期因子之间的相关系数普遍高于后期因子,其中植被类型、树种结构和其他相关因子的平均相关系数为0.868和0.733,显著高于其他三个缺失因子;(2)所有随机森林分类模型的准确度均达到0.770以上,并且在省级和县级尺度都具有出色的外部有效性,其中相关性系数高的缺失因子对应的模型准确度也相对更高;(3)特征因子重要性结果与相关性分析的结果基本吻合,显示特征因子组合中当期因子的占比高有助于提高模型填补性能,此外缺失因子本身对应的后一期数值对提高模型填补性能的贡献较大。研究可用于完善森林资源动态监测数据库,为科学评估我国生态保护建设成效以及完善森林分类经营管理制度提供支撑。在未来的研究中,基于国家森林高质量发展的基本策略,通过严密的实验设计评估我国森林分类经营制度的建设成效,对于完善我国森林生态效益补偿制度,建立稳定、健康、优质、高效的森林生态系统具有至关重要的作用。

关键词：缺失因子森林资源清查生态保护机器学习森林分类经营

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杭州市森林资源动态监测与土地调查成果协同对比分析

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林业资源管理 2020年第3期 52-57+77页

作者：刘诚郑云峰杨锦鑫陆亚刚国家林业和草原局华东调查规划设计院广州大学地理科学学院

通过对比分析杭州市森林资源动态监测数据与土地调查成果,探讨林业专项数据中林地及重要森林资源与土地调查成果的差异化程度、差异分布及差异产生的原因,为加快杭州市林业专项纳入现行国土空间规划体系提供科学依据。结果表明,杭州市... 详细信息

通过对比分析杭州市森林资源动态监测数据与土地调查成果,探讨林业专项数据中林地及重要森林资源与土地调查成果的差异化程度、差异分布及差异产生的原因,为加快杭州市林业专项纳入现行国土空间规划体系提供科学依据。结果表明,杭州市森林资源动态监测数据与土地调查更新成果的地类一致性整体较高,平均达到88.06%。差异图斑以集体林,人工林,商品林和低保护等级的林地为主,但国有林,天然林,重点公益林等重要森林资源的差异总面积依然庞大,是需要林业部门重点关注的几大类型。

关键词：杭州市森林资源动态监测土地调查对比分析

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基于SilverLight和REST的富网络地理信息系统框架设计

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地球信息科学学报 2012年第2期14卷 192-198页

作者：陆亚刚邱知游先祥张红梅陈丽北京林业大学林学院北京100083 国家林业局调查规划设计院北京100714 杭州市园林文物局钱江管理处杭州310008

在WebGIS的快速发展过程中,其架构方法和实现技术的研究一直是人们关注的热点。本文针对传统Web-GIS开发复杂度高、交互体验性贫乏、运行效率低等不足,在对RIA/SilverLight和REST技术的研究基础上,以整体结构模块化,开发行为统一化,代... 详细信息

在WebGIS的快速发展过程中,其架构方法和实现技术的研究一直是人们关注的热点。本文针对传统Web-GIS开发复杂度高、交互体验性贫乏、运行效率低等不足,在对RIA/SilverLight和REST技术的研究基础上,以整体结构模块化,开发行为统一化,代码可复用及经验可复用的指导思路下,提出由空间数据服务器(数据访问层DAL)、GIS服务和Web服务服务器(业务逻辑层BLL)及部署有SilverLight插件的浏览器(表现层UI)组成的3层架构式富网络地理信息系统,并阐述了数据层中空间属性数据库的设计和建立步骤以及优化经验,分析了业务逻辑层的构成和运行机制,为提高系统开发效率使用MVVM(Model-View-View Model,模型-视图-视图模型)设计模式,将表现层分为前端用户界面和后台逻辑两部分,并描述了用户熟悉的Office Ribbon设计样式的开发方法,说明了后台逻辑架构组件各自功能及通讯路径。最后,为验证此框架能够有效提高系统开发效率、丰富用户体验和改善系统运行性能表现等优势,利用SilverLight(C#)实现了应用实例——LightGIS。系统开发和运行实验表明,该框架能够很好地达成以下目的:(1)实现优美的用户操作界面和丰富的互操作性体验;(2)提供平滑、流畅的地图服务和高响应性空间分析;(3)具备优秀的系统可扩展潜力和可配置性。

关键词：富网络地理信息系统 SilverLight REST 框架设计 LightGIS

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高分辨率遥感影像在森林采伐限额检查中的判读精度探讨

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林业资源管理 2010年第3期 110-114页

作者：王小昆红玉陆亚刚张广军于晓光国家林业局调查规划设计院北京林业大学林学院

以鸡东县为研究区域,探索了高分辨率遥感影像对凭证伐区的目视判读精度,应用决策树法对判读结果进行分析,总结了判读结果与伐区采伐强度之间的关系,并就如何提高遥感技术对采伐地块的判读精度等问题进行了探讨。

关键词：高分辨率遥感影像采伐限额判读精度

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Synergistic Effect of Dual-Doped Carbon on MO_(2)C Nanocrystals Facilitates Alkaline Hydrogen Evolution

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Nano-Micro Letters 2023年第10期15卷 101-111页

作者： Min Zhou Xiaoli Jiang Weijie Kong Hangfei Li Fei lu Xin Zhou yagang Zhang School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731People’s Republic of China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 610054People’s Republic of China College of Physical Science and Technology Yangzhou UniversityYangzhou 225002People’s Republic of China Department of Chemical Engineering Polytechnique MontrealMontrealQC H3C 3A7Canada

Molybdenum carbide(MO_(2)C)materials are promising electrocatalysts with potential applications in hydrogen evolution reaction(HER)due to low cost and Pt-like electronic ***,their HER activity is usually hindered by the strong hydrogen binding ***,the lack of water-cleaving site's makes it difficult for the catalysts to work in alkaline ***,we designed and synthesized a B and N dual-doped carbon layer that encapsulated on MO_(2)C nanocrystals(MO_(2)C@BNC)for accelerating HER under alkaline *** electronic interactions between the MO_(2)C nanocrystals and the multiple-doped carbon layer endow a near-zero H adsorption Gibbs free energy on the defective C atoms over the carbon ***,the introduced B atoms afford optimal H_2O adsorption sites for the water-cleaving ***,the dual-doped MO_(2)C catalyst with synergistic effect of non-metal sites delivers superior HER performances of a low overpotential(99 mV@10 mA cm^(-2))and a small Tafel slope(58.1 mV dec^(-1))in 1 M KOH ***,it presents a remarkable activity that outperforming the commercial 10%Pt/C catalyst at large current density,demonstrating its applicability in industrial water *** study provides a reasonable design strategy towards noble-metal-free HER catalysts with high activity.

关键词： Molybdenum carbide Hydrogen evolution reaction Dual-doped Synergistic effect Superior performances

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Hierarchical ferric-cobalt-nickel ternary oxide nanowire arrays supported on graphene fibers as high-performance electrodes for flexible asymmetric supercapacitors

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Nano Research 2018年第4期11卷 1775-1786页

作者： Jingxin Zhao Chaowei Li Qichong Zhang Jun Zhang Xiaona Wang Juan Sun Juanjuan Wang Jixun Xie Ziyin Lin Zhuo Li Weibang lu Conghua lu yagang Yao School of Materials Science and Engineering Tianjin University Tianjin 300072 China Division of Advanced Nanomaterials Key Laboratory of Nanodevices and Applications Suzhou Institute of Nano-tech and Nano-bionics Chinese Academy of Sciences University of Chinese Academy of Sciences Suzhou 215123 China School of Materials Science and Engineering Georgia Institute of Technology 771 Ferst Drive Atlanta 30332 USA

Fiber-based supercapacitors （FSCs） are new members of the energy storage family. They present excellent flexibility and have promising applications in lightweight, flexible, and wearable devices. One of the existing challenges of FSCs is enhancing their energy density while retaining the flexibility. We developed a facile and cost-effective method to fabricate a highly capacitive positive electrode based on hierarchical ferric-cobalt-nickel ternary oxide nanowire arrays/graphene fibers and a negative electrode based on polyaniline-derived carbon nanorods/graphene fibers. The elegant microstructures and excellent electrochemical performances of both electrodes enabled us to construct a high- performance flexible asymmetric graphene fiber-based supercapacitor device with an operating voltage of 1.4 V, a specific capacitance up to 61.58 ***-2, and an energy density reaching 16.76 μW·h·cm-2. Moreover, the optimal device presents an outstanding cycling stability with 87.5% initial capacitance retention after 8,000 cycles, and an excellent flexibility with a capacitance retention of 90.9% after 4,000 cycles of repetitive bending.

关键词： fiber-based supercapacitors ferric-cobalt-nickel ternary oxide nanowire arrays polyaniline-derived carbon nanorods flexibility

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Signal interference between drugs and metabolites in LC-ESI-MS quantitative analysis and its evaluation strategy

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Journal of Pharmaceutical Analysis 2024年第7期14卷 1024-1034页

作者： Fulin Jiang Jingyu Liu yagang Li Zihan lu Qian Liu Yunhui Xing Janshon Zhu Min Huang Guoping Zhong Institute of Clinical Pharmacology School of Pharmaceutical SciencesSun Yat-sen UniversityGuangzhou510080China Guangdong RangerBio Technologies Co. Ltd.DongguanGuangdong523000China

Liquid chromatography-electrospray ionization tandem mass spectrometry(LC-ESI-MS)is a widely utilized technique for in vivo pharmaceutical *** interference within electrospray ion source,occurring between drugs and metabolites,can lead to signal variations,potentially compromising quantitative ***,method validation often overlooks this type of signal interference,which may result in systematic errors in quantitative results without matrix-matched *** this study,we conducted an investigation using ten different groups of drugs and their corresponding metabolites across three LC-ESI-MS systems to assess the prevalence of signal *** interferences can potentially cause or enhance nonlinearity in the calibration curves of drugs and metabolites,thereby altering the relationship between analyte response and concentration for ***,we established an evaluation scheme through a step-by-step dilution assay and employed three resolution methods:chromatographic separation,dilution,and stable labeled isotope internal standards *** above strategies were integrated into the method establishment process to improve quantitative accuracy.

关键词： Liquid chromatography-electrospray ionization tandem mass spectrometry(LCESI-MS) Drugs Metabolites Ionization interference Quantitative analysis

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Fabrication,microstructures,and optical properties of Yb:lu_(2)O_(3) laser ceramics from co-precipitated nano-powders

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Journal of Advanced Ceramics 2020年第6期9卷 674-682页

作者： Ziyu LIU Guido TOCI Angela PIRRI Barbara PATRIZI yagang FENG Jiabei WEI Feng WU Zhaoxiang YANG Matteo VANNINI Jiang LI Key Laboratory of Transparent Opto-functional Inorganic Materials Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 201899China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Istituto Nazionale di Ottica Consiglio Nazionale delle RicercheCNR-INOSesto Fiorentino(Fi)50019Italy Istituto di Fisica Applicata“N.Carrara” Consiglio Nazionale delle RicercheCNR-IFACSesto Fiorentino(Fi)50019Italy School of Material Science and Engineering Jiangsu UniversityZhenjiang 212013China

The Yb:lu_(2)O_(3)precursor made up of spherical particles was synthesized through the co-precipitation method in the water/ethanol *** 5 at% Yb:lu_(2)O_(3)powder is in the cubic phase after calcination at 1100℃ for 4 *** powder also consists of spherical nanoparticles with the average particle and grain sizes of 96 and 49 nm,*** average grain size of the pre-sintered ceramic sample is 526 nm and that of the sample by hot isostatic pressing grows to 612 *** 1.0 mm-thick sample has an in-line transmittance of 81.6%(theoretical value of 82.2%)at 1100 *** largest absorption cross-section at 976 nm is 0.96×1^(0-20)cm^(2) with the emission cross-section at 1033 nm of 0.92×10^(-20)cm^(2) and the gain cross sections are calculated with the smallest population inversion parameter β of *** highest slope efficiency of 68.7% with the optical efficiency of 65.1% is obtained at 1033.3 nm in quasi-continuous wave(QCW)*** the case of continuous wave(CW)pumping,the highest slope efficiency is 61.0% with the optical efficiency of 54.1%.The obtained laser performance indicates that Yb:lu_(2)O_(3)ceramics have excellent resistance to thermal load stresses,which shows great potential in high-power solid-state laser applications.

关键词： Yb:lu_(2)O_(3)transparent ceramics co-precipitated nano-powder spectroscopic properties laser performance hot isostatic pressing

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