The Poyang Lake is the largest fresh water lake in China, of which the vast area is about 39955 km. The Poyang Lake Area, on the other hand, is the place where floods often occur. In order to reduce the impact and damage of floods on the lives and properties of people living in the Poyang Lake Area, the authors have developed a Geographical Information System for preventing and controlling floo...

Operators for geographical databases can be classified into two categories: thematic-oriented operators and network-oriented operators. Thematic-oriented operators are based on geometric representations (e.g., intersection, inclusion, adjacency). Network-oriented operators are based on graph manipulations whatever the geometric representation is (e.g., a transitive closure of a graph). In this ...

In this paper, we present a visual language dedicated to spatial data called Lvis. This language has been defined as an extension of the Cigales visual language based on the Query-By-Example principle. The language is based on predefined icons modelling spatial objects and operators which are used to build a visual query. The visual query is then translated into the host language of any Geograp...

backgrounds and aims: using geographical information system (gis) can decreases the burden of road traffic injuries effectively by identification of hot spot to modification in hazardous areas. the aim of the study was determining geographical distribution of human risk factors associated with road traffic injuries by using geographical information system (gis) in iran. materials and methods: t...

Ever-increasing energy demand has led to geographic expansion of transmission lines and their complexity. In addition, higher reliability is expected in the transmission systemsdue to their vital role in power systems. It is very difficult to realize this goal by conventional monitoring and control methods. Thus, phasor measurement units (PMUs) are used to measure system parameters. Although in...

lack of awareness of the critical factors involved in production of plants and sometimes, the cultivation of plants in areas unsusceptible to plant, can increase the amount of chemical fertilizer consumption in order to compensate the subsequent reduction of plant yield. this would increase environmental pollution. thus, identifying of suitable areas where could supply plants initial needs of t...

Even with much activity over the past decade, including organized efforts on both sides of the Atlantic, the representation of both space and time in digital databases is still problematic and functional space-time systems have not gone beyond the limited prototype stage. Why is this the case? Why did it take twenty years from the ®rst GIS for the for representation and analysis in the temporal...

this study aims at identifying the suitable areas for ecotourism using geographic information system (gis) and analytical hierarchy process (ahp) in experimental and educational kheyroud forest, nowshar, mazandaran province. the evaluation process was conducted based on three groups including ecological, infrastructural, and socio-economic criteria. then, the indicators of each main groups were...