Abstract. Rangelands are mainly used for grazing the livestock in Iran, it is essential to specify grazing suitability of rangelands in each region of country, so that it may improve the management policies and approaches for planning and designing current and future plans. The aim of this research was to determine the rangeland suitability for sheep grazing in the watershed of Sadegh Abad, Ker...

the aim of this study was to present a model to identify and interpret sport places per capita according to distribution of thiessen networks in geographical information system (gis) space. to execute the model, three regions (5, 6 & 13) of isfahan city were considered and indoor pools were also considered as the sport place sample. dwg-format region maps and their blocks, spatial data and accu...

Everybody knows how much synoptic maps are useful today. An excellent example above all is Google Earth [1],: its simplicity and friendly interface allows every user to have the Earth maps ready in just one simple layout; nevertheless a crucial dimension is missing in Google Earth: the time. This doesn’t mean we simply aim to add history to Google Earth (though it could be already a nice goal):...

This paper introduces a visual query system for geographical information systems, which is easy to use for non-professional persons. The system creates a new iconic metaphor — a card, which has a very strong expressive power and can be used to represent complex spatial objects and spatial relationships between objects. The end users can describe their query requirements in a visual programming ...

For the effective use of a araphic information processina system, information-integration capabilities are impohant. ~ e r < the information-intearation is defined as an interactive execution of simulationtasks and a database management task. This concept as well as its practical methods are explained in this paper by the introduction of a geographical information system (GIs). The GIs consists...

This paper describesa regional geographical information system (GIS) for some Mediterranean benthic communities. The area covered by the GIS lies between the cities of La Ciotat and Giens in southeast France. The distinctive characteristics of this GIS compared with others usuallydescribed in the literature, are that all its layersdescribethe same theme but as seen at different moments with dif...

Water resources projects are inherited with overlapping and at times conflicting objectives. These projects are often of varied sizes ranging from major projects with command areas of millions of hectares to very small projects implemented at the local level. Thus, in all these projects there is seldom proper coordination which is essential for ensuring collective sustainability. Integrated wat...

The generalized transitive closure operator can be used to ask and answer a number of sophisticated queries on a database which is viewed as a directed graph. These queries cannot be expressed in SQL or relational algebra and neither can they be answered by commercially available relational or object-oriented database systems. In this report we describe the design and implementation of the gene...

To improve the spatial retrieving by means of Geographical Information Systems (GIS), a distributed GIS-Application has been designed. This application is mainly focused on making spatial analysis, throughout Spatial Analyzer Module (SAM). SAM contains several spatial and mathematical models that have been designed and implemented for detecting landslides and flooding areas. Users can make an a...

Today, the thematic layer is still the prevailling structure in geomatics for handling geographical information. However, the layer model is rigid: it implies partitionning geographical data in predefined categories and using the same description schema for all elements of a layer. Recently, Logical Information Systems (LIS) introduced a new paradigm for information management and retrieval. Us...