نتایج جستجو برای: مدل gis

تعداد نتایج: 150986  

ژورنال: :پژوهش های ژئومورفولوژی کمی 0
محمدتقی اعلمی دانشکده عمران، دانشگاه تبریز لیلا ملکانی دانشگاه تبریز محمدعلی قربانی دانشکده کشاورزی، گروه مهندسی آب، دانشگاه تبریز

با توجه به اهمیت تخمین صحیح رواناب در مدیریت حوضه و طراحی سازه های آبی، از گذشته تا به امروز روش های مختلفی برای مدل سازی بارش-رواناب ارائه شده است که اتومای سلولی یکی از جدیدترین آن ها می باشد. در این روش چشم انداز حوضه با شبکه ای از سلول ها تعریف گردیده و اندرکنش بین سلول ها با استفاده از قوانین حاکم بر فیزیوگرافی حوضه منجر به مدل سازی رواناب می شود. این مدل به gis و تصاویر ماهواره ای وابستگی...

در این مقاله سعی بر آن است با نگاهی گذرا بر محدودیت ها و نارسایی های جنبه­ های آموزشی، تحقیقاتی روش های سنتی نمایش عوارض زمین در اهمیت سیستم های نمایشی جدید تأکید گردد. نمایش سه بعدی از GIS و جنبه ­های کاربردی آن بخش بعدی را به خود اختصاص می ­دهد. قسمت اصلی مقاله در رابطه با مدل های (رقومی - گرافیکی) نظیر سازی شده سه بعدی از عوارض زمین می باشد. در همین زمینه تکنیک های کارتوگرافی و کامپیوتری در...

Journal: :Cartographica 2005
Francis Harvey Mei-Po Kwan Marianna Pavlovskaya

Does critical theory have a place in GIS? While the answer today is "yes," and some stable ground around its understanding has been created, "critical GIS" remains an oxymoron for many GIS users and critical social theorists. Since 1968, the year in which Roger Tomlinson for the first time referred to GIS in designating the Ganadian Geographic Information System, GIS has become a multibillion-d...

2017
Nieves R. Brisaboa Alejandro Cortiñas Miguel R. Luaces Oscar Pedreira

Geographic Information Systems (GIS) have increased its popularity for some time now, specially in the context of mobile devices. There are many disciplines and companies improving their workflow by using GIS on devices with geolocation features. To satisfy the emergent demand, lots of web-based GIS applications are being developed. These applications diverge in their target and context, but th...

2002
Nadine Schuurman

An epistemological and discursive divide separates critics of GIS and its researchers. An assumption exists among many users and developers of GIS that the technology models reality and can thus be used to predict and explain spatial processes. This realist position is not sanctioned by social science critics of GIS who have focused efforts on illustrating the social effects of technology as we...

2000
Mary-Ellen Feeney Francisco Escobar Ian P. Williamson

As society becomes increasingly spatially enabled, Geographical Information Systems (GIS) will evolve, and geographical information will be embedded in most information applications and services that society uses. This trend presents many opportunities and challenges. It means GIS technologies will facilitate ‘more’ by becoming ‘less’. As the general use of GIS increases, the visible appearance...

2003
Jantien Stoter

Introduction Since early ’90 GIS has become a sophisticated system for maintaining and analysing spatial and semantic information on spatial objects. The need for 3D information is rapidly increasing. 2D GIS analysis have shown its limitations in some situations, e.g. noise prediction models (noise spreads out in three dimensions) (Kluijver and Stoter, 2003), water flood models, air pollution m...

2001
Simon Montagu A. Simon Montagu

P lanning's " quiet revolution " in information technology (Godschalk and McMahon, 1992) may have finally come of age. Through the decade of the 1990s, Geographic Information Systems (GIS) has evolved from a technological novelty distinguished by its operational complexities into a much easier to use, less expensive, and now seemingly indispensible tool of the planning profession. GIS skills th...

1999
Shanzhen Yi Qi Li Jicheng Cheng

Increasing application of Geospatial information requires integration , fusion and interoperability of current monolithic GIS, especially more complex and multidisciplinary involved application. Interoperability is base for information integration and fusion. we give five-level GIS interoperability model(InteroModel5). The spatial information infrastructure(SII) provides a sharing spatial infor...

2001
Jonás Arturo Montilva

The notion of hypermap emerged as a response to the need for adding to geographical information systems (GIS) the linking and semantics capabilities of hypermedia. A hypermap is a new and powerful instrument for thematic cartography and spatial analysis in GIS. It extends the ability of a GIS to represent, store, manipulate, and display digital maps with the associative linking and interactive ...

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