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The effects of factor generalization scales on the reproduction of dynamic urban growth

Geo-Spatial Information Science 2022年第3期25卷 457-475页

作者： Yongjiu Feng Peiqi Wu Xiaohua Tong Pengshuo Li Rong Wang Yilun Zhou Jiafeng Wang Jinyu Zhao College of Surveying&Geo-Informatics Tongji UniversityShanghaiChina The Shanghai Key laboratory of Space Mapping and remote sensing for planetary Exploration Tongji UniversityShanghaiChina

The production and selection of driving factors are essential to building a strong Cellular Automata(CA)model of dynamic urban growth simulation.A critical issue that should be addressed is how the spatial representation and the generalization scale of driving factors affect the CA modeling and the simulation *** is challenging to evaluate the effectiveness of the selected driving factors because they have no true *** explore the impacts of the generalization scales,we produced nine sets of driving factors at nine scales to calibrate the CA models based on the Particle Swarm Optimization(CAPSO)and applied them to simulate urban growth of Suzhou during *** results show that the driving factors at a smaller scale have much better performance in explaining urban growth simulations as inferred by the Explained Residual Deviance(ERD)of the Generalized Additive Models(GAMs).Specifically,the ERD declined from 51.9%to 45.9%as the factor scale became larger during 2000-2020,but there was a peak value(52.2%)at *** all simulations during 2000-2020,the CAPSO models with larger-scale factors have slightly lower overall accuracy and Figure-of-Merit(FOM),which respectively decreased by 3.1%and 4.4%as compared to the CA models with scale-free *** concluded that the driving factors at a smaller scale(200~400 m for point-like facilities and 7~14 m for line-like facilities)can build more accurate CA models to simulate urban growth patterns,and the optimal scale for factors can be identified using the *** study contributes to the methods of evaluating the effectiveness of driving factor production and reveals the impacts of spatial representation of factors on the CA modeling and simulation considering the factor generalization scales.

关键词： Cellular automata urban growth driving factors scale effects generalized additive model

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Advances in spaceborne hyperspectral remote sensing in China

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Geo-Spatial Information Science 2021年第1期24卷 95-120,I0012页

作者： Yanfei Zhong Xinyu Wang Shaoyu Wang Liangpei Zhang State Key laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhanChina School of remote sensing and Information Engineering Wuhan UniversityWuhanChina

With the maturation of satellite technology,Hyperspectral remote sensing(HRS)platforms have developed from the initial ground-based and airborne platforms into spaceborne platforms,which greatly promotes the civil application of HRS imagery in the fields of agriculture,forestry,and environmental *** is playing an important role in this evolution,especially in recent years,with the successful launch and operation of a series of civil hyper-spectral spacecraft and satellites,including the Shenzhou-3 spacecraft,the Gaofen-5 satellite,the SPARK satellite,the Zhuhai-1 satellite network for environmental and resources monitoring,the FengYun series of satellites for meteorological observation,and the Chang’E series of spacecraft for planetary *** Chinese spaceborne HRS platforms have various new characteristics,such as the wide swath width,high spatial resolution,wide spectral range,hyperspectral satellite networks,and *** paper focuses on the recent progress in Chinese spaceborne HRS,from the aspects of the typical satellite systems,the data processing,and the *** addition,the future development trends of HRS in China are also discussed and analyzed.

关键词： Hyperspectral remote sensing spaceborne HRS hyperspectral image processing and remote sensing applications

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Urban growth scenario projection using heuristic cellular automata in arid areas considering the drought impact

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Journal of Arid Land 2024年第4期16卷 580-601页

作者： TANG Xiaoyan FENG Yongjiu LEI Zhenkun CHEN Shurui WANG Jiafeng WANG Rong TANG Panli WANG Mian JIN Yanmin TONG Xiaohua College of Surveying&Geo-Informatics Tongji UniversityShanghai 200092China Shanghai Key laboratory of Space Mapping and remote sensing for planetary Exploration Tongji UniversityShanghai 200092China

Arid areas with low precipitation and sparse vegetation typically yield compact urban pattern,and drought directly impacts urban site selection,growth processes,and future *** simulation and projection based on cellular automata(CA)models is important to achieve sustainable urban development in arid *** developed a new CA model using bat algorithm(BA)named bat algorithm-probability-of-occurrence-cellular automata(BA-POO-CA)model by considering drought constraint to accurately delineate urban growth patterns and project future scenarios of Urumqi City and its surrounding areas,located in Xinjiang Uygur Autonomous Region,*** calibrated the BA-POO-CA model for the drought-prone study area with 2000 and 2010 data and validated the model with 2010 and 2020 data,and finally projected its urban scenarios in *** results showed that BA-POO-CA model yielded overall accuracy of 97.70%and figure-of-merits(FOMs)of 35.50%in 2010,and 97.70%and 26.70%in 2020,*** inclusion of drought intensity factor improved the performance of BA-POO-CA model in terms of FOMs,with increases of 5.50%in 2010 and 7.90%in 2020 than the model excluding drought intensity *** suggested that the urban growth of Urumqi City was affected by drought,and therefore taking drought intensity factor into account would contribute to simulation *** BA-POO-CA model including drought intensity factor was used to project two possible scenarios(i.e.,business-as-usual(BAU)scenario and ecological scenario)in *** the BAU scenario,the urban growth dominated mainly in urban fringe areas,especially in the northern part of Toutunhe District,Xinshi District,and Midong *** exceptional and extreme drought areas as a spatial constraint,the urban growth was mainly concentrated in the"main urban areas-Changji-Hutubi"corridor urban pattern in the ecological *** results of this research can help to adjust urban planning and development *** mode

关键词： bat algorithm cellular automata(CA) probability-of-occurrence drought intensity algorithm-probability-of-occurrence-cellular automata(BA-POO-CA)model arid areas

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Validation and Spatiotemporal Distribution of GEOS-5-Based planetary Boundary Layer Height and Relative Humidity in China

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Advances in Atmospheric Sciences 2018年第4期35卷 479-492页

作者： Yidan SI Shenshen LI Liangfu CHEN Chao YU Zifeng WANG Yang WANG Hongmei WANG State Key laboratory of remote sensing Sciences Institute of Remote Sensing and Digital Earth Chinese Academy of Sciences Beijing 100101 China University of Chinese Academy of Sciences Beijing 100049 China

Few studies have specifically focused on the validation and spatiotemporal distribution of planetary boundary layer height （PBLH） and relative humidity （RH） data in China. In this analysis, continuous PBLH and surface-level RH data simulated from GEOS-5 between 2004 and 2012, were validated against ground-based observations. Overall, the simulated RH was consistent with the statistical data from meteorological stations, with a correlation coefficient of 0.78 and a slope of 0.9. However, the simulated PBLH was underestimated compared to LIDAR data by a factor of approximately two, which was primarily because of poor simulation in late summer and early autumn. We further examined the spatiotemporal distribution characteristics of two factors in four regions--North China, South China, Northwest China, and the Tibetan Plateau. The results showed that the annual PBLH trends in all regions were fairly moderate but sensitive to solar radiation and precipitation, which explains why the PBLH values were ranked in order from largest to smallest as follows： Tibetan Plateau, Northwest China, North China, and South China. Strong seasonal variation of the PBLH exhibited high values in summer and low values in winter, which was also consistent with the turbulent vertical exchange. Not surprisingly, the highest RH in South China and the lowest RH in desert areas of Northwest China （less than 30%）. Seasonally, South China exhibited little variation, whereas Northwest China exhibited its highest humidity in winter and lowest humidity in spring, the maximum values in the other regions were obtained from July to September.

关键词： GEOS-5 planetary boundary layer height relative humidity validation spatiotemporal distribution

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Robust template feature matching method using motion-constrained DCF designed for visual navigation in asteroid landing

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Astrodynamics 2023年第1期7卷 83-99页

作者： Yaqiong Wang Xiongfeng Yan Zhen Ye Huan Xie Shijie Liu Xiong Xu Xiaohua Tong College of Surveying and Geo-Informatics and Shanghai Key Laboratory of Space Mapping and Remote Sensing for Planetary EaplorationTongji UniversityShanghai 200092China Shanghai Institute of Intelligent Science and Technology Shanghai 200092China

A robust and eficient feature matching method is necessary for visual navigation in asteroid-landing *** on the visual navigation framework and motion characteristics of asteroids,a robust and efficient template feature matching method is proposed to adapt to feature distortion and scale change cases for visual navigation of *** proposed method is primarily based on a motion-constrained discriminative correlation filter(DCF).The prior information provided by the motion constraints between sequence images is used to provide a predicted search region for template feature ***,some specific template feature samples are generated using the motion constraints for correlation filter learning,which is beneficial for training a scale and feature distortion adaptive correlation filter for accurate feature ***,average peak-to-correlation energy(APCE)and jointly consistent measurements(JCMs)were used to eliminate false *** captured by the Touch And Go Camera System(TAGCAMS)of the Bennu asteroid were used to evaluate the performance of the proposed *** particular,both the robustness and accuracy of region matching and template center matching are *** qualitative and quantitative results illustrate the advancement of the proposed method in adapting to feature distortions and large-scale changes during spacecraft landing.

关键词： discriminative correlation filter(DCF) motion constraints feature distortion adaptive scale changes adaptive template feature matching

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Study on the estimation of Euler angles for Macao Science Satellite-1

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Earth and planetary Physics 2023年第1期7卷 144-150页

作者： Qing Yan JiaMing Ou Le Suo Yi Jiang PengFei Liu State Key laboratory of Lunar and planetary Sciences Macao University of Science and TechnologyMacaoChina Institute of remote sensing Satellite China Academy of Space TechnologyBeijing 100094China

The Euler angle estimation is a calibration method for vector data measured by the magnetometer on a *** is used to find the relative rotation between the coordinate system of the magnetometer and the satellite(usually determined by Star Imagers).Before launch of the low-orbit,low-inclination Macao Science Satellite-1(known as MSS-1),we simulated the estimation of Euler angles by using the magnetic measurements of the in-orbit Swarm and China Seismo-Electromagnetic Satellite(noted as CSES),with various data *** this study,11 data sets were designed to analyze the estimation results for the MSS-1 orbit by using a joint estimation method of the geomagnetic field model parameters and Euler *** the model results,we found that all the spatial power spectral lines showed behavior consistent with that of the CHAOS-7.8 model at low degrees(corresponding to large-scale magnetic signals).The spectra of models without global data coverage deviated much more(by a maximum of~10^(4) nT^(2))from those of the CHAOS-7.8 model at higher *** models with global data coverage and with various data combinations,the spectral lines were distributed ***,the models with accordant power spectral distributions demonstrated different Euler angle *** more vector data at higher latitudes were included,the estimated Euler angles varied monotonically in all three *** models with vector data in the same latitude range showed similar Euler angle results,regardless of whether the poleward scalar data were *** largest value difference was found between the models using vector data within±40°latitudes and those using vector data within±60°latitudes,which reached to~28″.Therefore,we concluded that the inversion of the spherical harmonic Gauss coefficients in our tests was mainly affected by the spatial coverage range of the data,whereas the estimation of Euler angles largely depended on the latitude range where the vector d

关键词： Macao Science Satellite-1(MSS-1) geomagnetic fields Euler angle estimation low-inclination orbit

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Global absorption center map of the mafic minerals on the Moon as viewed by CE-1 IIM data

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Science China(Physics,Mechanics & Astronomy) 2010年第12期53卷 2160-2171页

作者： WU YunZhao ZHANG Xia YAN BoKun GAN FuPing TANG ZeSheng XU AoAo ZHENG YongChun ZOU YongLiao School of Geographic and Oceanographic Sciences Nanjing UniversityNanjing 210093China Institute of remote sensing Applications Chinese Academy of SciencesBeijing 100101China Institute for remote sensing Method China Aero Geophysical Survey and Remote Sensing Center for Land and ResourcesBeijing 100083China Collaborative Research laboratory on Lunar and planetary Exploration Macao University of Science and TechnologyTaipaMacaoChina National Astronomical Observatories Chinese Academy of SciencesBeijing 100012China

Determining the global distribution of minerals on the Moon has been an important goal of lunar science. Hyperspectral remote sensing is an important approach to acquiring minerals on the Moon on the global scale. The wavelength of the absorption band center is the key parameter for identifying minerals with reflectance spectra as well as remote sensing data. The global absorption center map of the mafic minerals of the Moon was produced for the first time with the Chang’E-1 IIM data. This map shows the global distribution of mafic minerals such as orthopyroxenes, clinopyroxenes, and olivine and even plagioclase feldspar of the Moon. The validation for some representative areas indicates that the global map is reliable and even more detailed than the results derived from Clementine-data. Moreover, our method is insensitive to the topography and viewing and illumination geometries. The global absorption band center map not only contributes to the lunar science research, but also has other implications to be further studied. Moreover, the preprocessing methods such as calibration and correction introduced in this study can be useful in other research with IIM data.

关键词： Chang’E-1 IIM absorption band center calibration Moon

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The subsurface structure and stratigraphy of the Chang’E-4 landing site:orbital evidence from small craters on the Von Kármán crater floor

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Research in Astronomy and Astrophysics 2020年第1期20卷 57-68页

作者： Xiao-Hui Fu Le Qiao Jiang Zhang Zong-Cheng Ling Bo Li Shandong Provincial Key laboratory of Optical Astronomy and Solar-Terrestrial Environment Institute of Space SciencesShandong UniversityWeihai 264209China State Key laboratory of Lunar and planetary Sciences Macao University of Science and TechnologyTaipaMacaoChina CAS Center for Excellence in Comparative Planetology Hefei 230026China State Key laboratory of remote sensing Science Institute of Remote Sensing and Digital EarthChinese Academy of SciencesBeijing 100101China

Chang’E-4(CE-4)successfully landed on the floor of the Von Kármán crater within the South Pole-Aitken basin(SPA).One of its scientific objectives is to determine the subsurface structure and the thickness of lunar regolith at the landing site and along the traverse route of the Yutu-2 *** orbital data,we employed small craters(diameters<1 km)on the floor of the Von Kármán crater as probes to investigate the subsurface structure and stratigraphy of the CE-4 landing *** this study,40 dark-haloed craters that penetrate through the surface Finsen ejecta and excavate underlying mare deposits were identified,and 77 bright ray craters that expose only the underlying fresh materials but do not penetrate through the surface Finsen ejecta were *** excavation depths of these craters and their distances from the Finsen crater center were calculated,and the thickness distribution of Finsen ejecta on the Von Kármán floor was systematically *** boundary between Finsen ejecta and underlying mare basalt at the CE-4 landing site is constrained to a depth of 18 *** have proposed the stratigraphy for the CE-4 site and interpreted the origins of different layers and the geological history of the Von Kármán *** results provide valuable geological background for interpreting data from the Lunar Penetrating Radar(LPR)and Visible and Near-infrared Imaging Spectrometer(VNIS)on the Yutu-2 *** CE-4 landing site could provide a reference point for crater ejecta distribution and mixing with local materials,to test and improve ejecta thickness models according to the in situ measurements of the CE-4 LPR.

关键词： Chang’E-4 dark-haloed crater ejecta thickness Moon

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Ancient subsurface structure beneath crater Clavius:constraint by recent high-precision gravity and topography data

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Research in Astronomy and Astrophysics 2019年第1期19卷 95-102页

作者： Zhen Zhong Jian-Guo Yan J.Alexis P.Rodriguez School of Physics and Electronic Science Guizhou Normal University State Key laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan University Guizhou Provincial Key laboratory of Radio Astronomy and Data Processing Guizhou Normal University planetary Science Institute

With the increasing precision of the GRAIL gravity field models and topography from LOLA, it is possible to investigate the substructure beneath crater Clavius. An admittance between gravity and topography data is commonly used to estimate selenophysical parameters, including load ratio, crustal thickness and density, and elastic thickness. Not only a surface load, but also a subsurface load is considered in estimation. The algorithm of particle swarm optimization(PSO) with a swarm size of 400 is employed as *** indicate that the observed admittance is best-fitted by the modeled admittance based on a spherical shell model, which was proved to be unsatisfactory in the previous study. The best-fitted load ratio f is around-0.194. Such a small load ratio conforms to the direct proportion between the nearly uncompensated topography and its corresponding negative gravity anomaly. It also indicates that a surface load dominates all the loads. Constrained within 2σSTD, a small crustal thickness(～30 km) and a crustal density of ～2587 kg m-3are found, quite close to the results from previous GRAIL research. Considering the well constrained crustal thickness and density, the best-fitted elastic thickness(～7 km) is rational. This result is slightly smaller than the previous study(～12 km). Such difference can be attributed to the difference in crustal density used and the precision of gravity and topography data. Considering that the small difference between the modeled gravity anomaly and observations is quite small, a parameter inversed here could be an indicator of the subsurface structure beneath Clavius.

关键词： Moon planetary systems:planets and satellites:fundamental parameters planetary systems methods:data analysis

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Positional Error Model of Line Segments with Modeling and Measuring Errors Using Brownian Bridge

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Journal of Geodesy and Geoinformation Science 2023年第2期6卷 1-10页

作者： Xiaohua TONG Lejingyi ZHOU Yanmin JIN College of Surveying and Geo-informatics Tongji UniversityShanghai 200092China Shanghai Key laboratory for planetary Mapping and remote sensing for Deep Space Exploration Shanghai 200092China

Spatial linear features are often represented as a series of line segments joined by measured endpoints in surveying and geographic information *** are not only the measuring errors of the endpoints but also the modeling errors between the line segments and the actual geographical *** paper presents a Brownian bridge error model for line segments combining both the modeling and measuring ***,the Brownian bridge is used to establish the position distribution of the actual geographic feature represented by the line ***,an error propagation model with the constraints of the measuring error distribution of the endpoints is ***,a comprehensive error band of the line segment is constructed,wherein both the modeling and measuring errors are *** proposed error model can be used to evaluate line segments’overall accuracy and trustability influenced by modeling and measuring errors,and provides a comprehensive quality indicator for the geospatial data.

关键词： spatial data line segment modeling error measuring error Brownian bridge

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