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Ontological exploration of geospatial objects in context

Geo-Spatial Information Science 2014年第2期17卷 129-138页

作者： Mohammad H.VAHIDNIA ali a.alesheikh Faculty of Geodesy and Geomatics Engineering Department of Geospatial Information SystemsKhajeh Nasir Toosi University of TechnologyNo.1346Mirdamad CrossValiasr StreetTehran 19967-15433Iran

Structured study of spatial objects and their relationships leads to a better cognition of the geospatial information and creates the concept of context at a higher level of *** study is aimed at providing a comprehensive definition of the context for geospatial objects.A combination of binary qualitative spatial relationships(***,distance,and topological relations)among the members of a set of spatial objects will be used *** addition,by incorporating the general concept of context,obtained from either static data(attributes in a database)or dynamic data(sensors),the compact context of spatial objects will be *** framework for presentation of the involved knowledge and conception about the objects in context is also explored using ontology and description logic because of powerful conceptualization of relationships,either spatial or non-spatial,*** this purpose,the hierarchies of main structure and object properties are formed at *** constraint and characteristics of classes,such as subclasses,equivalent classes,cardinality etc.,and object properties,such as being functional,transitive,symmetric,asymmetric,inverse functional,disjoint etc.,are discovered and presented in more detail using web ontology language in description logic *** implementation is then performed in the framework of semantic web and extensible markup language *** method ultimately facilitates,spatial reasoning by effective querying in a semantic framework taking pellet reasoner and SPARQL(a recursive acronym for SPARQL Protocol and RDF Query Language).

关键词： spatial objects’context geographic information system qualitative spatial relation ontology description logic OWL

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Modeling the spread of spatio-temporal phenomena through the incorporation of ANFIS and genetically controlled cellular automata: a case study on forest fire

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International Journal of Digital Earth 2013年第1期6卷 51-75页

作者： Mohammad H.Vahidnia ali a.alesheikh Saeed Behzadi Sara Salehi Geodesy and Geomatics Engineering Department of Geospatial Information SystemK.N.Toosi University of TechnologyTehranIran Faculty of Geodesy and Geomatics Engineering Department of PhotogrammetryK.N.Toosi University of TechnologyTehranIran

Virtual representation and simulation of spatio-temporal phenomena is a promising goal for the production of an advanced digital *** modeling,which is one of the most helpful analyses in the geographic information system(GIS),plays a prominent role in meeting this *** study proposes a new model that considers both aspects of static and dynamic behaviors of spreadable spatio-temporal in cellular automata(CA)***,artificial intelligence tools such as adaptive neuro-fuzzy inference system(ANFIS)and genetic algorithm(GA)were used in accordance with the objectives of knowledge discovery and *** conditions in updating states are considered so traditional CA transition rules can be accompanied with the impact of fuzzy discovered knowledge and the solution of spread *** focused on the estimation of forest fire growth as an important case study for decision makers.A two-dimensional cellular representation of the combustion of heterogeneous fuel types and density on non-flat terrain were successfully linked with dynamic wind and slope *** validation of the simulation on experimental data indicated a relatively realistic head-fire *** investigations showed that the results obtained using the dynamic controlling with GA in the absence of static modeling with ANFIS were unacceptable.

关键词： geographic information system adaptive neuro-fuzzy inference system cellular automata genetic algorithm spatio-temporal spread forest fire digital earth

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A GIS-based time-dependent seismic source modeling of Northern Iran

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Earthquake Engineering and Engineering Vibration 2017年第1期16卷 33-45页

作者： Mahdi Hashemi ali Asghar alesheikh Mohammad Reza Zolfaghari School of Information Seiences University of Pittsburgh Pittsburgh Pennsylvania 15260 USA Department of Geospatial Information Systems K.N. Toosi University of Technology Tehran 19697 Iran Civil Engineering Department K.N. Toosi Universiry of Technology Tehran 19697 Iran

： The first step in any seismic hazard study is the definition of seismogenic sources and the estimation of magnitude-frequency relationships for each source. There is as yet no standard methodology for source modeling and many researchers have worked on this topic. This study is an effort to define linear and area seismic sources for Northern Iran. The linear or fault sources are developed based on tectonic features and characteristic earthquakes while the area sources are developed based on spatial distribution of small to moderate earthquakes. Time-dependent recurrence relationships are developed for fault sources using renewal approach while time-independent frequency-magnitude relationships are proposed for area sources based on Poisson process. GIS functionalities are used in this study to introduce and incorporate spatial- temporal and geostatistical indices in delineating area seismic sources. The proposed methodology is used to model seismic sources for an area of about 500 by 400 square kilometers around Tehran. Previous researches and reports are studied to compile an earthquake/fault catalog that is as complete as possible. All events are transformed to uniform magnitude scale; duplicate events and dependent shocks are removed. Completeness and time distribution of the compiled catalog is taken into account. The proposed area and linear seismic sources in conjunction with defined recurrence relationships can be used to develop time-dependent probabilistic seismic hazard analysis of Northern Iran.

关键词： seismic source modeling geostatistical index seismic hazard GIS

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Uncovering implicit Seismogenic associated regions towards promoting urban resilience

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Resilient Cities and Structures 2024年第4期3卷 83-94页

作者： Roya Habibi ali Asghar alesheikh Faculty of Geodesy and Geomatics Engineering K.N.Toosi University of TechnologyTehranIran

Earthquakes pose a significant threat to urban environments,highlighting the need for enhanced seismic *** improve understanding of earthquake dynamics and the interplay of seismic activity across space,this study introduces a novel approach for identifying associated regions that exhibit interdependence seismic behavior,revealing a network structure of earthquake *** model was applied to earthquakes exceeding 3.0 Mw in Iran(1976–2023),using a 1°×1°*** and seasonal timespans were evaluated to capture potential short-term and long-term *** model revealed a network of interdependent seismic regions in southern and southwestern Iran,predominantly located within the Zagros ***,the strongest associations were observed between spatial units 45 and 36,located approximately 6°apart in southern *** units exhibited significant association in both monthly and seasonal scenarios,with support values of 0.28 and 0.65,and average confidence values of 0.58 and 0.84,*** second significant bilateral relation was detected between neighboring spatial units 22 and 36,with support values of 0.26 and 0.59,and average confidence values of 0.57 and 0.80,*** recognized structure was compared to the established seismotectonic *** network aligns with established seismotectonic provinces,particularly in the seasonal *** model also identified potential interactions between distinct zones in the monthly scenario,highlighting areas where urban development strategies might need ***,the analysis revealed implicit causal relationships between spatial units,pinpointing areas susceptible to or influencing seismic activities *** results contribute to a deeper understanding of crustal structure,earthquake propagation,and the potential for seismic activity to trigger earthquakes in nearby or distant *** knowledge is crucial for developing effective strategies to b

关键词： Earthquake pattern Spatiotemporal association rule Iran Seismotectonic zoning Apriori

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An Efficient Approach for Historical Storage and Retrieval of Segmented Road Data in Geographic Information System for Transportation

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Chinese Geographical Science 2010年第3期20卷 236-242页

作者： Mohammad Reza Jelokhani-Niaraki ali Asghar alesheikh Abolghasem Sadeghi-Niaraki Faculty of Geodesy and Geomatics Engineering K. N. Toosi University of TechnologyTehran Iran Department of Geoinformatics Engineering Inha UniversityIncheon South Korea

One of the most powerful functions of Geographic Information System for Transportation (GIS-T) is Dynamic Segmentation (DS), which is used to increase the efficiency and precision of road management by generating segments based on attributes. The road segments describing transportation data are both spatially and temporally referenced. For a variety of transportation applications, historical road segments must be preserved. This study presents an appropriate approach to preserve and retrieve the historical road segments efficiently. In the proposed method, only the portions of segments of a time stamp that have been changed into new segments rather than storing the entire segments for every old time stamp are recorded .The storage of these portions is based on the type of changes. A recursive algorithm is developed to retrieve all segments for every old time stamp. Experimental results using real data of Tehran City, Iran justify the strength of the proposed approach in many aspects. An important achievement of the results is that database volume for 2006, 2007 and 2008 within the Historical Line Event Table (HLET) is reduced by 70%, 80% and 78%, respectively. The proposed method has the potential to prevent from vast data redundancy and the unnecessary storage of entire segments for each time stamp. Since the present technique is performed on ordinary plain tables that are readable by all GIS software, special software platforms to manage the storage and retrieval of historical segments are not needed. In addition, this method simplifies spatio-temporal queries.

关键词： GIS-T dynamic segmentation change type recursive algorithm time stamp

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