نتایج جستجو برای: geospatial information system gis has emerged as a very powerful tool for capturing
تعداد نتایج: 16760200 فیلتر نتایج به سال:
fluorescence chemical sensors for the highly sensitive and selective determination of pb2+ , hg2+, co2+ and fe3+ ions in aqueous solutions are described. the ion sensing system was prepared by incorporating lipophilic ligand (l) as a neutral ion-selective fluoroionophore in the plasticized pvc membrane containing sodium tetraphenylborate or potasium tetrakis (p-chlorophenyl) borate as a liphoph...
nowadays, standardized metadata for geospatial data is a key in sharing and finding information on the web and crucial in building geospatial data infrastructure (gdi). the main objective of this paper was to develop a web-based metadata dissemination system for in-situ sensors based on, most importantly, interoperable, standard and open technologies introduced by open gis consortium (ogc), nam...
Geographic Information System (GIS) is one of the important elements of the IT infrastructure of local governments. In recent years, in the consequence of development of Web-based GIS technology, the definition of GIS has been changing to “Geospatial Information Service”. For a local government, the geospatial information service is becoming an important IT system in the field of information se...
BACKGROUND Geographic Information Systems (GIS) are powerful communication tools for public health. However, using GIS requires considerable skill and, for this reason, is sometimes limited to experts. Web-based GIS has emerged as a solution to allow a wider audience to have access to geospatial information. Unfortunately the cost of implementing proprietary solutions may be a limiting factor i...
this study was conducted to investigate the impact of podcasts as a learning and teaching tool on iranian efl learners’ motivation for listening as well as on their listening comprehension ability. the study also investigated the learners’ perception towards listening to podcasts and examined whether the learners were likely to accept podcasts. out of fifty-five intermediate learners studying e...
there are many approaches for solving variety combinatorial optimization problems (np-compelete) that devided to exact solutions and approximate solutions. exact methods can only be used for very small size instances due to their expontional search space. for real-world problems, we have to employ approximate methods such as evolutionary algorithms (eas) that find a near-optimal solution in a r...
This article describes conceptions of geospatial information (GI) as they are perceived amongst Geographic Information System/ Science (GIS) academics and students in three GIS online distance learning (ODL) programmes in the UK and US, through an embedded exploratory multiple case study. We highlight the user input element of GI that emerged in the conceptions of GI. Using this element, we unc...
in this thesis, we consider a mathematical model of cancer with completely unknown parameters. we study the stability of critical points which are biologically admissible. then we consider a control on the system and introduce situations at which solutions are attracted to critical points and so the cancer disease has auto healing. the lyapunov stability method is used for estimating the un...
GRASS is a well-known geographic information system developed more than 30 years ago. As one of the earliest GIS systems, GRASS has currently survived mainly as free, open-source desktop GIS software, with users primarily limited to the research community or among programmers who use it to create customized functions. To allow average GIS end users to continue taking advantage of this widely-us...
The complex and proprietary nature of geospatial data makes them almost non-sharable among large user community. GIS interoperability is necessary for realizing a successful spatial data infrastructure. With the advancements of web service technology, GIS interoperability has made a paradigm shift – from monolithic GIS providers to distributed geospatial services. The applicability of web servi...
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