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DSFA: cross-scene domain style and feature adaptation for landslide detection from high spatial resolution images

International Journal of Digital Earth 2023年第1期16卷 2426-2447页

作者： Penglei Li Yi Wang Tongzhen Si Kashif Ullah Wei Han Lizhe Wang School of Geophysics and Geomatics China University of GeosciencesWuhanPeople’s Republic of China School of Computer Science Wuhan UniversityWuhanPeople’s Republic of China School of Computer Science China University of GeosciencesWuhanPeople’s Republic of China

Rapid and accurate landslide inventory mapping is significant for emergency rescue and post-disaster ***,deep learning methods exhibit excellent performance in supervised landslide ***,due to differences between cross-scene images,the performance of existing methods is significantly degraded when directly applied to another scene,which limits the application of rapid landslide inventory *** this study,we propose a novel Domain Style and Feature Adaptation(DSFA)method for cross-scene landslide detection from high spatial resolution images,which can leverage labeled source domain images and unlabeled target domain images to mine robust landslide representations for different ***,we mitigate the large discrepancy between domains at the dataset level and feature *** the dataset level,we introduce a domain style adaptation strategy to shift landslide styles,which not only bridges the domain gap,but also increases the diversity of landslide *** the feature level,adversarial learning and domain distance minimization are integrated to narrow large feature distribution discrepancies for learning domain-invariant *** addition,to avoid information omission,we improve the U-Net3+*** experimental results demonstrate that DSFA has superior detection capability and outperforms other methods,showing its great application potential in unsupervised landslide domain detection.

关键词： Landslide detection deep learning remote sensing domain adaptation high spatial resolution

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Object-Oriented Method of Land Cover Change Detection Approach Using high spatial resolution Remote Sensing Data

Object-Oriented Method of Land Cover Change Detection Approa...

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作者：李家存中国科学院遥感应用研究所

＜正＞ Several land cover change detection approaches have been developed such as traditional post-classification cross-tabulation, cross-correlation analysis, neural networks and knowledge-based expert systems. But the procedures for analyzing remote sensing image have relied upon pixel-based methods. So, these methods are restricted by the spatial resolution of remote sensing image and widely used with moderate resolution *** the advent of high spatial resolution remote sensing data, this situation is different. The characteristics of high spatial resolution remote sensing image are different essentially with these of moderate resolution image. So, these traditional methods are not applicable with the new data. In order to solve the problems and make full use of the advantages of high spatial resolution data, an object-oriented land cover change detection approach was developed in this paper. The whole image was segmented into several objects by texture characteristics and relationship between each pixel. Then, a supervised classification was carried out at the object level. The change detection was also realized by the comparison between images of different times.

关键词： object-oriented land cover change detection high spatial resolution

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Accelerated Segmentation Approach with CUDA for high spatial resolution Remotely Sensed Imagery Based on Improved Mean Shift

Accelerated Segmentation Approach with CUDA for High Spatial...

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中国测绘学会第九次全国会员代表大会暨学会成立50周年纪念大会

作者：孙笑古南京大学地理学院地理信息科学系

In conventional researches, satisfying results cannot be achieved when directly applying Mean Shift segmentation onto high spatial resolution (HR) remote sensing image. The proposed method addresses this problem and extents Mean Shift clustering algorithm into high-dimensional feature space by extracting texture and shape descriptor. The dilemma in image segmentation is that the algorithms with good performance are also the ones with much computational cost. To improve the performance of the standard Mean Shift segmentation for HR remote sensing images, an accelerated segmentation approach is proposed under Compute Unified Device Architecture (CUDA) framework. The experimental results demonstrate that the CUDA-based implementation works 20-30 times faster than the original implementation in CPU.

关键词： Mean Shift texture shape CUDA segmentation high spatial resolution

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A stopping layer concept to improve the spatial resolution of gas-electron-multiplier neutron detector

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Chinese Physics B 2022年第5期31卷 225-230页

作者： Jianjin Zhou Jianrong Zhou Xiaojuan Zhou Lin Zhu Jianqing Yang Guian Yang Yi Zhang Baowei Ding Bitao Hu Zhijia Sun Limin Duan Yuanbo Chen School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China Spallation Neutron Source Science Center Dongguan 523803China State Key Laboratory of Particle Detection and Electronics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China

In recent years,gas electron multiplier(GEM)neutron detectors have been developing towards high spatial resolution and high dynamic counting *** propose a novel concept of an Al stopping layer to enable the detector to achieve sub-millimeter(sub-mm)spatial *** neutron conversion layer is coated with the Al stopping layer to limit the emission angle of ions into the drift *** short track projection of ions is obtained on the signal readout board,and the detector would get good spatial *** spatial resolutions of the GEM neutron detector with the Al stopping layer are simulated and optimized based on Geant4 Garfield *** spatial resolution of the detector is 0.76 mm and the thermal neutron detection efficiency is about 0.01%when the Al stopping layer is 3.0μm thick,the drift region is 2 mm thick,the strip pitch is 600μm,and the digital readout is ***,the GEM neutron detector with a simple detector structure and a fast readout mode is developed to obtain a high spatial resolution and high dynamic counting *** could be used for the direct measurement of a high-flux neutron beam,such as Bragg transmission imaging,very small-angle scattering neutron detection and neutron beam diagnostic.

关键词： high spatial resolution Al stopping layer GEM neutron detector spallation neutron source

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highly spatial imaging of electrochemical activity on the wrinkles of graphene using all-solid scanning electrochemical cell microscopy

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Fundamental Research 2022年第2期2卷 193-197页

作者： Rong Jin Hong-yan Lu Lei Cheng Jian Zhuang Dechen Jiang Hong-Yuan Chena State Key Ldioratory of Analytical Chemistry for Life Science School of Chemistry and Chemical Engineering Nanjing UniversityNanjing Jiangsiif 210023China School of Mechanical Engineering Xi'an Jiaotong UniversityXi'anShanxi710049China

Here,all-solid scanning electrochemical cell microscopy(SECCM)is first established by filling polyacrylamide(PAM)into nanocapillaries as a solid electrolyte.A solid PAM nanoball at the tip of a nanocapillary contacts graphene and behaves as an electrochemical cell for simultaneously measuring the morphology and electrochemical *** with liquid droplet-based SECCM,this solid nanoball is stable and does not leave any electrolyte at the contact regions,which permits accurate and continuous scanning of the surface without any ***,the resolutions in the lateral(x-y)and vertical(z)directions are improved to〜10 *** complete scanning of the wrinkles on graphene records low currents at the two sidewalls of the wrinkles and a relatively high current at the center of the *** heterogeneity in the electrochemical activity of the wrinkle illustrates different electron transfer features on surfaces with varied curvatures,which is hardly observed by the current electrochemical or optical *** successful establishment of this high spatial electrochemical microscopy overcomes the current challenges in investigating the electrochemical activity of materials at the nanoscale,which is significant for a better understanding of electron transfer in materials.

关键词： Scanning electrochemical cell microscopy Solid electrolyte high spatial resolution Electrochemical activity Wrinkle

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high resolution, high SENSITIVITY MOIRE METHOD

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Acta Mechanica Sinica 1999年第2期15卷 176-181页

作者：王朝阳戴福隆蒋小林 Department of Engineering Mechanics Tsinghua University Beijing China 100084

Based on geometric moire method, moire interferometry and microscopic moire interferometry, a high spatial resolution and high sensitivity geometric microscopic moire method is presented. Geometric micron-moire patterns are produced by the superposition of two high frequency gratings through a microscope system. Compared with other grating-based photo-mechanics methods, microscopic moire method could provide whole-field moire patterns of both high spatial resolution and high sensitivity. The frequency of specimen and reference gratings used in this method can be from 1 line/mm to 10000 lines/mm. Additionally, a 4F optical filter system is used to enhance the contrast of microscopic moire patterns effectively.

关键词： high spatial resolution high sensitivity geometric moire microscope

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Research on sea surface temperature retrieval by the one-dimensional synthetic aperture microwave radiometer, 1D-SAMR

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Acta Oceanologica Sinica 2020年第5期39卷 115-122页

作者： Weihua Ai Mengyan Feng Guanyu Chen Wen Lu College of Meteorology and Oceanography National University of Defense TechnologyNanjing 211101China PLA Troop 32033 Haikou 570100China

Due to the low spatial resolution of sea surface temperature(T_S)retrieval by real aperture microwave radiometers,in this study,an iterative retrieval method that minimizes the differences between brightness temperature(T_B)measured and modeled was used to retrieve sea surface temperature with a one-dimensional synthetic aperture microwave radiometer,temporarily named 1 *** the configuration of the radiometer,an angular resolution of 0.43°was reached by theoretical *** on sea surface temperature retrieval were carried out with ideal parameters;the results show that the main factors affecting the retrieval accuracy of sea surface temperature are the accuracy of radiometer calibration and the precision of auxiliary geophysical *** the case of no auxiliary parameter errors,the greatest error in retrieved sea surface temperature is obtained at low T_S scene(i.e.,0.7106 K for the incidence angle of 35°under the radiometer calibration accuracy of0.5 K).While errors on auxiliary parameters are assumed to follow a Gaussian distribution,the greatest error on retrieved sea surface temperature was 1.3305 K at an incidence angle of 65°in poorly known sea surface wind speed(W)(the error on W of 1.0 m/s)over high W scene,for the radiometer calibration accuracy of 0.5 K.

关键词： sea surface temperature synthetic aperture microwave radiometer retrieval accuracy radiometer calibration accuracy auxiliary parameter errors high spatial resolution

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Retrieval of Sea Surface Wind Speed by One-Dimensional Synthetic Aperture Microwave Radiometer

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Journal of Tropical Meteorology 2021年第1期27卷 62-69页

作者： AI Wei-hua FENG Meng-yan LU Wen MA Shuo CHEN Guan-yu College of Meteorology and Oceanography National University of Defense TechnologyNanjing 211101 China PLA Troop 32033 Haikou 570100 China

One-dimensional synthetic aperture microwave radiometers have higher spatial resolution and record measurements at multiple incidence *** this paper,we propose a multiple linear regression method to retrieve sea surface wind speed at an incidence angle between 0°65°.We assume that a one-dimensional synthetic aperture microwave radiometer operates at frequencies of 6.9,10.65,18.7,23.8 and 36.5 ***,the microwave radiative transfer forward model is used to simulate the measured brightness *** sensitivity of the brightness temperatures at 0°65°to the sea surface wind speed is ***,vertical polarization channels(VR),horizontal polarization channels(HR)and all channels(AR)are used to retrieve the sea surface wind speed via a multiple linear regression algorithm at 0°65°,and the relationship between the retrieval error and incidence angle is *** results are as follows:(1)The sensitivity of the vertical polarization brightness temperature to the sea surface wind speed is smaller than that of the horizontal polarization.(2)The retrieval error increases with Gaussian *** retrieval error of VR first increases and then decreases with increasing incidence angle,the retrieval error of HR gradually decreases with increasing incidence angle,and the retrieval error of AR first decreases and then increases with increasing incidence angle.(3)The retrieval error of AR is the lowest and it is necessary to retrieve the sea surface wind speed at a larger incidence angle for AR.

关键词： sea surface wind speed high spatial resolution synthetic aperture microwave radiometer multiple incidence angles multiple linear regression algorithm

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Observations of Dynamic Turbulence in the Lower Stratosphere over Inner Mongolia Using a high-resolution Balloon Sensor Constant Temperature Anemometer

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Advances in Atmospheric Sciences 2022年第3期39卷 519-528页

作者： Xiaoyu REN Yi LIU Zhaonan CAI Yuli ZHANG Carbon Neutrality Research Center Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing100029China University of Chinese Academy of Sciences Beijing 100049China

We present characterizations of the dynamic turbulence in the lower stratosphere measured by a new balloon-based system designed for detecting finer scale dynamic turbulence. The balloon-based system included a constant temperature anemometer(CTA) operating at a sampling rate of 2 k Hz at an ascent speed of 5 m s^(-1)(corresponding to a vertical resolution of 2.5 mm), an industrial personal computer, batteries, sensors for ambient temperature and humidity, an A/D converter, and others. The system was successfully launched to 24 km altitude over Bayannur City, Inner Mongolia Province. Results show the spatial intermittence of the turbulence layers, with clear boundaries between turbulent and nonturbulent regions. This is the first time that the dynamic turbulence spectrum down to the viscous sub-range has been obtained throughout the lower stratosphere over China. With that, the energy dissipation rates of dynamic turbulence could be calculated with high precision. The profile of the dissipation rates varied from 7.37 × 10^(-7) to 4.23 W kg^(-1) and increased with altitude in the stratosphere.

关键词： dynamic turbulence stratosphere balloon payload high spatial resolution dissipation rates Inner Mongolia

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Study of muon tomographic imaging for high-Z material detection with a Micromegas-based tracking system

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Radiation Detection Technology and Methods 2020年第3期4卷 263-268页

作者： Cheng-Ming Liu Qun-Gang Wen Zhi-Yong Zhang Guang-Shun Huang State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China AnHui University Hefei 230061China

Purpose To study the cosmic ray muon tomographic imaging of high-Z material with Micromegas-based tracking *** A high-spatial-resolution tracking system was set up with the micro-mesh gaseous structure(Micromegas)detec-tors in order to study the muon tomographic imaging *** layers of 90 mm×90 mm one-dimensional readout Micromegas were used to construct a tracking *** and conclusion The imaging test using some metallic bars was performed with cosmic ray muons.A two-dimensional imaging of the test object was presented with a newly proposed ratio *** result of this work shows that the ratio algorithm is well performed.

关键词： Muon tomography imaging Micromegas detector Ratio algorithm high spatial resolution

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