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Canopy Roughness:A New Phenotypic Trait to Estimate Aboveground Biomass from Unmanned Aerial System

Plant Phenomics 2020年第1期2卷 419-428页

作者： Monica Herrero-Huerta Alexander Bucksch eetu puttonen Katy M.Rainey Department of Agronomy Purdue UniversityWest LafayetteINUSA Department of Cartographic and Land Engineering Higher Polytechnic School of AvilaUniversity of SalamancaAvilaSpain Institute for Plant Sciences College of AgriculturePurdue UniversityWest LafayetteINUSA Department of Plant Biology University of GeorgiaAthensGAUSA Warnell School of Forestry and Natural Resources University of GeorgiaAthensGAUSA Institute of Bioinformatics University of GeorgiaAthensGAUSA Finnish Geospatial Research Institute National Land Survey of FinlandMasalaFinland

Cost-effective phenotyping methods are urgently needed to advance crop genetics in order to meet the food,fuel,and fiber demands of the coming ***,characterizing plot level traits in fields is of particular *** developments in highresolution imaging sensors for UAS(unmanned aerial systems)focused on collecting detailed phenotypic measurements are a potential *** introduce canopy roughness as a new plant plot-level *** tested its usability with soybean by optical data collected from UAS to estimate *** validate canopy roughness on a panel of 108 soybean[Glycine max(L.)Merr.]recombinant inbred lines in a multienvironment trial during the R^(2) growth stage.A senseFly eBee UAS platform obtained aerial images with a senseFly *** digital *** a structure from motion(SfM)technique,we reconstructed 3D point clouds of the soybean experiment.A novel pipeline for feature extraction was developed to compute canopy roughness from point *** used regression analysis to correlate canopy roughness with field-measured aboveground biomass(AGB)with a leave-one-out ***,our models achieved a coefficient of determination(R^(2))greater than 0.5 in all ***,we found that canopy roughness has the ability to discern AGB variations among different *** test trials demonstrate the potential of canopy roughness as a reliable trait for high-throughput phenotyping to estimate *** such,canopy roughness provides practical information to breeders in order to select phenotypes on the basis of UAS data.

关键词： soybean Biomass roughness

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A practical method utilizing multi-spectral LiDAR to aid points cloud matching in SLAM

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Satellite Navigation 2020年第1期1卷 317-327页

作者： Changhui Jiang Yuwei Chen Wenxin Tian Ziyi Feng Wei Li Chunchen Zhou Hui Shao eetu puttonen Juha Hyyppä Department of Remote Sensing and Photogrammetry Finnish Geospatial Research Institute(FGI)02430 MasalaFinland Interdisciplinary Division of Aeronautical and Aviation Engineering The Hong Kong Polytechnic UniversityKowloonHong KongChina Key Laboratory of Quantitative Remote Sensing Information Technology Chinese Academy of Sciences(CAS)Beijing 100094China School of Electrical Engineering Aalto University02150 EspooFinland The School of Electronic and Information Engineering Anhui Jianzhu UniversityHefei 230601China

Light Detection and Ranging(LiDAR)sensors are popular in Simultaneous Localization and Mapping(SLAM)owing to their capability of obtaining ranging information *** have attempted to use the intensity information that accompanies each range measurement to enhance LiDAR SLAM positioning ***,before employing LiDAR intensities in SLAM,a calibration operation is usually carried out so that the intensity is independent of the incident angle and *** range is determined from the laser beam transmitting ***,the key to using LiDAR intensities in SLAM is to obtain the incident angle between the laser beam and target *** a complex environment,it is difficult to obtain the incident angle *** procedure also complicates the data processing in SLAM and as a result,further application of the LiDAR intensity in SLAM is *** by this problem,in the present study,we propose a Hyperspectral LiDAR(HSL)-based-intensity calibration-free method to aid point cloud matching in *** employed in this study can obtain an eight-channel range accompanied by corresponding intensity *** to the design of the laser,the eight-channel range and intensity were collected with the same incident angle and *** to the laser beam radiation model,the ratio values between two randomly selected channels’intensities at an identical target are independent of the range information and incident *** test the proposed method,the HSL was employed to scan a wall with different coloured papers pasted on it(white,red,yellow,pink,and green)at four distinct positions along a corridor(with an interval of 60 cm in between two consecutive positions).Then,a ratio value vector was constructed for each *** ratio value vectors between consecutive laser scans were employed to match the point cloud.A classic Iterative Closest Point(ICP)algorithm was employed to estimate the HSL motion using the range information from t

关键词： SLAM Laser intensity LiDAR Calibration

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高光谱激光雷达：三维生物物理化学生态测量学

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遥感信息 2017年第1期32卷 5-9页

作者：林沂 eetu puttonen Juha HYYPPA 北京大学地球与空间科学学院北京100871 芬兰地球空间研究所芬兰马萨拉FI-02430

生态测量学为生态学、地理学、林学、野生生物学等提供基础的技术支撑,开发适应上述学科发展的新型生态测量技术日渐重要,尤其随着目前生物地球化学的快速推进,开发三维生物物理化学生态测量技术成为当前的研究热点,然而当前的主流遥感... 详细信息

生态测量学为生态学、地理学、林学、野生生物学等提供基础的技术支撑,开发适应上述学科发展的新型生态测量技术日渐重要,尤其随着目前生物地球化学的快速推进,开发三维生物物理化学生态测量技术成为当前的研究热点,然而当前的主流遥感测量技术仍无法做到高效准确。高光谱激光雷达技术的发展为解决该问题提供了可能,这也通过基于连续测量的3种单木高光谱激光雷达数据实现反演光合有效辐射、树冠叶绿素含量与氮含量的三维分布及其昼夜变化趋势得到验证。实验结果预示随着高光谱激光雷达的成熟,三维生物物理化学生态测量学将得以建立,相应的三维生物物理化学生态测量技术将进一步推动地理学、生态学、生物地球化学乃至地球系统科学的发展。

关键词：高光谱激光雷达三维生物物理化学生态测量学叶绿素含量光合有效辐射分量氮含量

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Fe-Si particles on the surface of blast furnace coke

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International Journal of Minerals,Metallurgy and Materials 2015年第7期22卷 697-703页

作者： Stanislav S.Gornostayev eetu-Pekka Heikkinen Jyrki J.Heino Timo M.J.Fabritius Process Metallurgy Group University of Oulu

This study investigates the surface of unpolished samples of blast furnace （BF） coke drilled from the tuyere zone, which hosts Fe-Si particles （mostly Fe3Si） that vary in size, shape, depth of submersion （penetration） into the coke matrix, and contact features with the surface. Based on the shape of the particles and the extent of their contact with the coke matrix, they have been grouped into three major types：（I） sphere-like droplets with limited contact area, （II） semi-spheres with a larger contact area, and （III） irregular segregations with a spherical surface, which exhibit the largest contact area among the three types of particles. Considering the ratio between the height （h） of the particles and half of their length at the surface level （/） along the cross-section, these three types can be characterized as follows：（I） h 〉/, （II） h ~/, and （1II） h 〈/. All the three types of particles can be found near each other. The shape and the extent of the contact depend on the de- gree of penetration of the material into the matrix, which is a function of the composition of the particles. Type （I） particles were initially saturated with Si at an earlier stage and, for that reason, they can react less with carbon in the coke matrix than type （II） and （III）, thereby moving faster through the coke cone. Thermodynamic calculations have shown that the temperature interval of 1250-1300~C can be consid- ered the starting point for Si entering into molten iron under quartz-dominated coke ash. Accordingly, the initial pick-up of Si by molten iron can be assumed to be mineral-related. In terms of BF practice, better conditions for sliding Fe-Si droplets through the coke cone are available when they come into contact with free SiO2 concentrated into small grains, and when the SiO2/∑MexOy mass ratio in the coke ash is high.

关键词： blast furnace practice metallurgical coke molten iron iron silicide

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