abstract desertification could cause reduction of the ecological and biological potential of land which may occur both naturally and artificially. identifying and evaluating the effective factors in development of desertification is very important for better management of land. the aim of this research is to evaluate the sensitive input parameters in the desertification condition by using of ar...

The social coordination of geographic information technologies relies on collaboration between actors from the public, private, and education sectors. Diffusion, implementation, information sharing, and studies of the use of geographic information systems (GISs) examine the collaboration in relation to specific activities. Applying concepts from actor network theories, this article examines the...

A method for prediction and simulation based on Cell Based Geographic Information System: GIS as Cellular Automata: CA is proposed together with required data systems, in particular, metasearch engine usage in an unified way. It is confirmed that the proposed cell based GIS as CA has flexible usage of the attribute information which are attached to the cell in concern with location information ...

This work describes a novel tool, called ICPT (inversion-based coverage prediction tool), for predicting coverage field strength in outdoor cellular network by means of the inversion method. Instead of using the highprecision geometric modeling of wireless environments, the problem of radio propagation prediction is solved by using an inversion of the measured data (under all priori constraints...

30 road ~odels are widely used in many computer applications such as racing games and driving simulations_ However, almost all hl~h.-fideilly 3D road models were generated manually by professional artists at the expense of intensive labor. There are ver:J few eXlsllng methods for automatically generating 30 high-fidelity road networks, especially those existing in the real world. This paper pr....

open source gis researchgate open source gis a grass gis approach kluwer international a grass gis approach home springer open source gis a grass gis approach darkip neteler mitasova 19 mar 2004 open source gis: grass book the contribution of gis in flood mapping: two approaches open source gis: a grass gis approachthird open source approach to urban growth simulation researchgate implementing ...

این پژوهش با الهام گرفتن از نتایج یک طرح مطالعاتی کاربردی، رویکرد سلسله­‌مراتبی جهت پیگیری فرایند توسعه تأمین‌کنندگان و حمایت تصمیمات موجود در هر مراحل آن ارائه‌ می‌کند. ابتدا، زمینه‌های تأمین نیازمند سپس واجد شرایط هریک زمینه‌ها به کمک تصمیم‌گیری چندشاخصه بهترین-بدترین مشخص می‌گردند. معیارهای شناسایی نیز مرور مطالعات پیشین بهره‌گیری نظرات خبرگان حوزه‌ی خرید استخراج‌شده‌اند. درنهایت، مدل ریاضی ...

BACKGROUND An internet-based survey of influenza-like illness (ILI)--the Great Influenza Survey or GIS--was launched in the Netherlands in the 2003-2004 influenza season. The aim of the present study was to validate the representativeness of the GIS population and to compare the GIS data with the official ILI data obtained by Dutch GPs participating in the Dutch Sentinel Practice Network. MET...

he expanding presence of geographic information system (GIS) offices within organizations has helped to enhance the availability of GIS data and expertise, but not always to the benefit of the entire organization within which it is working. The separation— and frequently, isolation—of GIS specialists within agencies, institutions, and organizations often limits the potential usefulness of GIS t...