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An integrated model to simulate sown area ch.nges for major crops at a global scale

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Science Ch.na Earth.Sciences 2008年第3期51卷 370-379页

作者： shibasaki Ryosuke Center for Spatial Information Science University of Tokyo

Dynamics of land use systems h.ve attracted much.attention from scientists around th. world due to th.ir ecological and socio-economic implications. An integrated model to dynamically simulate future ch.nges in sown areas of four major crops (rice, maize, wh.at and soybean) on a global scale is pre- sented. To do so, a crop ch.ice model was developed on th. basis of Multinomial Logit (Logit) model to model land users' decisions on crop ch.ices among a set of available alternatives with.using a crop utility function. A GIS-based Environmental Policy Integrated Climate (EPIC) model was adopted to simulate th. crop yields under a given geoph.sical environment and farming management conditions, wh.le th. International Food Policy and Agricultural Simulation (IFPSIM) model was utilized to estimate crop price in th. international market. Th. crop ch.ice model was linked with.th. GIS-based EPIC model and th. IFPSIM model th.ough.data exch.nge. Th.s integrated model was th.n validated against th. FAO statistical data in 2001-2003 and th. Moderate Resolution Imaging Spectroradiometer (MODIS) global land cover product in 2001. Both.validation approach.s indicated reliability of th. model for ad- dressing th. dynamics in agricultural land use and its capability for long-term scenario analysis. Finally, th. model application was designed to run over a time period of 30 a, taking th. year 2000 as baseline. Th. model outcomes can h.lp understand and explain th. causes, locations and consequences of land use ch.nges, and provide support for land use planning and policy making.

关键词： land use ch.nge crop sown area simulation crop ch.ice global scale

Fully automatic DOM generation meth.d based on optical flow field dense image match.ng

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Geo-Spatial Information Science 2023年第2期26卷 242-256页

作者： Wei Yuan Xiuxiao Yuan Yang Cai Ryosuke shibasaki Sch.ol of Remote Sensing and Information Engineering Wuhan UniversityWuhanChina Center for Spatial Information Science University of TokyoKashiwaJapan

Automatic Digital Orth.ph.to Map(DOM)generation plays an important role in many downstream works such.as land use and cover detection,urban planning,and disaster *** DOM generation meth.ds can generate promising results but always need ground object filtered DEM generation before oth.-rectification;th.s can consume much.time and produce building facade contained *** address th.s problem,a pixel-by-pixel digital differential rectification-based automatic DOM generation meth.d is proposed in th.s ***,3D point clouds with.texture are generated by dense image match.ng based on an optical flow field for a stereo pair of images,***,th. grayscale of th. digital differential rectification image is extracted directly from th. point clouds element by element according to th. nearest neigh.or meth.d for match.d ***,th. elevation is repaired grid-by-grid using th. multi-layer Locally Refined B-spline(LR-B)interpolation meth.d with.triangular mesh.constraint for th. point clouds void area,and th. grayscale is obtained by th. indirect sch.me of digital differential rectification to generate th. pixel-by-pixel digital differentially rectified image of a single image ***,a seamline network is automatically search.d using a disparity map optimization algorith.,and DOM is smartly *** qualitative and quantitative experimental results on th.ee datasets were produced and evaluated,wh.ch.confirmed th. feasibility of th. proposed meth.d,and th. DOM accuracy can reach.1 Ground Sample Distance(GSD)*** comparison experiment with.th. state-of-th.-art commercial softwares sh.wed th.t th. proposed meth.d generated DOM h.s a better visual effect on building boundaries and roof completeness with.comparable accuracy and computational efficiency.

关键词： Digital Orth.ph.to Map(DOM) dense image match.ng based on optical flow field(OFFDIM) 3D point clouds with.texture seamline network accuracy

Web-based interactive visualization of 3D video mosaics using X3D standard

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Journal of Zh.jiang University-Science A(Applied Ph.sics & Engineering) 2006年第7期7卷 1259-1265页

作者： Ch.N Jaech.on LEE Yang-Won shibasaki Ryosuke Center for Spatial Information Science the University of Tokyo 4-6-1 Komaba Meguro Tokyo 153-8505 Japan

We present a meth.d of 3D image mosaicing for real 3D representation of roadside buildings, and implement a Web-based interactive visualization environment for th. 3D video mosaics created by 3D image mosaicing. Th. 3D image mo- saicing tech.ique developed in our previous work is a very powerful meth.d for creating textured 3D-GIS data with.ut excessive data processing like th. laser or stereo system. For th. Web-based open access to th. 3D video mosaics, we build an interactive visualization environment using X3D, th. emerging standard of Web 3D. We conduct th. data preprocessing for 3D video mosaics and th. X3D modeling for textured 3D data. Th. data preprocessing includes th. conversion of each.frame of 3D video mosaics into concatenated image files th.t can be h.perlinked on th. Web. Th. X3D modeling h.ndles th. representation of concatenated images using necessary X3D nodes. By employing X3D as th. data format for 3D image mosaics, th. real 3D representation of roadside buildings is extended to th. Web and mobile service systems.

关键词： 3D video mosaics Interactive 3D visualization Web 3D

Meth.ne deh.droaromatization over Mo-modified h.MFI for gas to liquid catalysts

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Journal of Environmental Sciences 2009年第6期21卷 736-740页

作者： h.rofumi Aritani h.romi shibasaki h.tosh. Orih.ra Atsush. Nakah.ra Department of Applied Ch.mistry Saitama Institute of Technology Graduate Sch.ol of Engineering Osaka Prefecture University

For direct gas to liquid（GTL）,a novel process producing energy sources for meth.ne deh.droaromatization is *** MoO3 on h.MFI zeolite sh.ws th. h.gh.catalytic capacity and a selective activity for deh.droaromatization of meth.ne to benzene at 973 K in a fixed bed *** th. oth.r h.nd,deactivation by coke on th. active sites in all th. catalysts is formed during th. reaction.h. co-feed suppressed th. deactivation,wh.ch.is probably due to th. decrease in coking *** K-edge X-ray absorption fine structure（XAFS） results sh.wed th. formation of dispersed Mo2C species with.low crystallinity after *** LIII-edge XANES（X-ray absorption near-edge structure） indicated th. formation of active Mo species including Mo2C and Mo-oxycarbide（MoOxCy）,wh.re th. redox state sh.uld be independent in th. absence/presence of *** is concluded th.t Mo-oxycarbide species act as h.gh.y active species,and th.ir stability affected th. durable activity in th. presence of h..

关键词： direct gas to liquid meth.ne deh.droaromatization Mo/h.MFI L-XANES K-XAFS

Interoperability for Global Observation Data by Ontological Information

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Tsingh.a Science and Tech.ology 2008年第S1期13卷 336-342页

作者： Masah.ko Nagai Masafumi Ono Ryosuke shibasaki Earth.Observation Data Integration and Fusion Research.Initiative (EDITORIA) The University of Tokyo Center for Spatial Information Science The University of Tokyo

Th. Ontology registry system is developed to collect, manage, and compare ontological information for integrating global observation data. Data sh.ring and data service such.as support of metadata deign, structuring of data contents, support of text mining are applied for better use of data as data interoperability. Semantic network dictionary and gazetteers are constructed as a trans-disciplinary dictionary. Ontological information is added to th. system by digitalizing text based dictionaries, developing 'knowledge writing tool' for experts, and extracting semantic relations from auth.ritative documents with.natural language processing tech.ique. Th. system is developed to collect lexicograph.c ontology and geograph.c ontology.

关键词： ontology interoperability data integration gazetteer semantic network dictionary

Integrating GPS trajectory and topics from Twitter stream for h.man mobility estimation

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Frontiers of Computer Science 2019年第3期13卷 460-470页

作者： Satosh. MIYAZAWA Xuan SONG Tianqi XIA Ryosuke shibasaki h.daka KANEDA Department of Socio-Cultural Environmental Studies Graduate School of Frontier Sciences The University of Tokyo Chiba 277-8563 Japan Center for Spatial Information Science The University of Tokyo Kashiwa 277-8568 Japan Zenrin DataCom Co. Ltd Tokyo 108-6206 Japan

Understanding urban dynamics and large-scale h.man mobility will play a vital role in building smart cities and sustainable urbanization. Existing research.in th.s domain mainly focuses on a single data source (e.g., GPS data, CDR data, etc.). In th.s study, we collect big and h.terogeneous data and aim to investigate and discover th. relationsh.p between spatiotemporal topics found in geo-tagged tweets and GPS traces from smartph.nes. We employ Latent Dirich.et Allocation-based topic modeling on geo-tagged tweets to extract and classify th. topics. Th.n th. extracted topics from tweets and temporal population distribution from GPS traces are jointly used to model urban dynamics and h.man crowd flow. Th. experimental results and validations demonstrate th. efficiency of our approach.and suggest th.t th. fusion of cross-domain data for urban dynamics modeling is more practical th.n previously th.ugh..

关键词： GPS trajectory h.man mobility SNS locationbased social network (LBSN) topic modeling data mining spatiotemporal topic

Development of a GIS-based Decision Support System for Assessing Land Use Status

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Geo-Spatial Information Science 2004年第1期7卷 72-78页

作者： Ryosuke shibasaki Kanich.ro Matsumura CENTER FOR SPATIAL INFORMATION SCIENCE THE UNIVERSITY OF TOKYO

Th. objectives of th.s study are to assess land s ui tability and to predict th. spatial and temporal ch.nges in land use types (LUTs ) by using GIS-based land use management decision support system. A GIS databas e with.data on climate, topograph., soil ch.racteristic, irrigation condition, f ertilizer application, and special socioeconomic activities h.s been developed a nd used for th. evaluation of land productivity for different crops by integrati ng with.a crop growth.model-th. erosion productivity impact calculator (EPIC). International food policy simulation model (IFPSIM) is also embedded into GIS fo r th. predictions of h.w crop demands and crop market prices will ch.nge under a lternative policy scenarios. An inference engine (IE) including land use ch.ice model is developed to illustrate land use ch.ice beh.vior based on logit models , wh.ch.allows to analyze h.w diversified factors ranging from climate ch.nges, crop price ch.nges to land management ch.nges can affect th. distribution of agr icultural land use. A test for integrated simulation is taken in each.0.1° by 0.1° grid cell to predict th. ch.nge of agricultural land use types at globa l level. Global land use ch.nges are simulated from 1992 to 2050.

关键词： EPIC land use decision support system international trade model logitmodel

Features of h.patocellular carcinoma in cases with.autoimmune h.patitis and primary biliary cirrh.sis

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World Journal of Gastroenterology 2009年第2期15卷 231-239页

作者： Takuya Watanabe Kenji Soga h.ruka h.rono Katsuh.ko h.segawa Koich. shibasaki h.rokazu Kawai Yutaka Aoyagi Department of Internal Medicine and Gastroenterology Medical Hospital The Nippon Dental University School of Life Dentistry at Niigata 1-8 Hamauracho Chu-o-ku Niigata 951-8580 Japan Department of Gastroen-terology Niigata University Graduate School of Medical and Dental Sciences 1-757 Asahimachi Chu-o-ku Niigata 951-8510 Japan

AIM: To ch.racterize th. clinical features of h.patocellular carcinoma (h.C) associated with.autoimmune liver disease, we critically evaluated th. literature on h.C associated with.autoimmune h.patitis (AIh. and primary biliary cirrh.sis (PBC). METh.DS: A systematic review of th. literature was conducted using th. Japana Centra Revuo Medicina database wh.ch.produced 38 cases of h.C with.AIh.(AIh.series) and 50 cases of h.C with.PBC (PBC-series). We compared th. clinical features of th.se two sets of patients with.th. general Japanese h.C population. RESULTS: On average, h.C was more common in men th.n in women with.AIh.or PBC. Wh.le many patients underwent ch.molipiodolization (CL) or transcath.ter arterial embolization (TAE) (AIh.series: P = 0.048 (vs operation), P = 0.018 (vs RFA, PEIT); PBC-series: P = 0.027 (vs RFA, PEIT), oth.rs refused th.rapeutic interventions [AIh.series: P = 0.038 (vs RFA, PEIT); PBC-series: P = 0.003 (vs RFA, PEIT)].Liver failure was th. primary cause of death.among patients in th.s study, followed by tumor rupture. Th. survival interval between diagnosis and death.was fairly sh.rt, averaging 14 ± 12 mo in AIh.patients and 8.4 ± 14 mo in PBC patients. CONCLUSION: We demonstrated common clinical features among Japanese cases of h.C arising from AIh.and PBC.

关键词： Autoimmune h.patitis Autoimmune liver disease h.patocellular carcinoma Literature review Primary biliary cirrh.sis

Ch.racterizing Spatial Patterns of Ph.nology in Cropland of Ch.na Based on Remotely Sensed Data

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Agricultural Sciences in Ch.na 2010年第1期9卷 101-112页

作者： WU Wen-bin YANG Peng TANG h.a-jun Zh.U Qing-bo Ch.N Zh.ng-xin Ryosuke shibasaki Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences/Key Laboratory of Resources Remote Sensing and Digital Agriculture Ministry of Agriculture Beijing 100081 P.R.China Center for Spatial Information Science University of Tokyo Tokyo 153-8505 Japan

Th.s study used time-series of global inventory modeling and mapping studies （GIMMS） normalized difference vegetation index （NDVI） datasets at a spatial resolution of 8 km and 15-d interval to investigate th. spatial patterns of cropland ph.nology in Ch.na. A smooth.ng algorith. based on an asymmetric Gaussian function was first performed on NDVI dataset to minimize th. effects of anomalous values caused by atmosph.ric h.ze and cloud contamination. Subsequent processing for identifying cropping systems and extracting ph.nological parameters, th. starting date of growing season （SGS） and th. ending date of growing season （EGS） was based on th. smooth.d NVDI time-series data. Th. results sh.wed th.t th. cropping systems in Ch.na became complex as moving from north.to south.of Ch.na. Under th.se cropping systems, th. SGS and EGS for th. first growing season varied largely over space, and th.se regions with.multiple cropping systems generally presented a significant advanced SGS and EGS th.n th. regions with.single cropping patterns. On th. contrary, th. ph.nological events of th. second growing season including both.th. SGS and EGS sh.wed little difference between regions. Th. spatial patterns of cropping systems and ph.nology in Ch.nese cropland were h.gh.y related to th. geoph.sical environmental factors. Several anth.opogenic factors, such.as crop variety, cultivation levels, irrigation, and fertilizers, could profoundly influence crop ph.nological status. h.w to discriminate th. impacts of bioph.sical forces and anth.opogenic drivers on ph.nological events of cultivation remains a great ch.llenge for furth.r studies.

关键词： ph.nology NDVI time-series cropping systems th. starting date of growing season (SGS) th. ending date of growing season (EGS) spatial pattern