نتایج جستجو برای: spatial data analysis

تعداد نتایج: 4682427  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه گیلان - دانشکده علوم انسانی 1392

this study investigated how group formation method, namely student-selected vs. teacher-assigned, influences the results of the community model of teaching creative writing; i.e., group dynamics and group outcome (the quality of performance). the study adopted an experimental comparison group and microgenetic research design to observe the change process over a relatively short period of time. ...

Journal: :Journal of Geographical Systems 2010
Harry H. Kelejian Ingmar R. Prucha

The purpose of this paper is to suggest estimators for the parameters of spatial models containing a spatially lagged dependent variable, as well as spatially lagged independent variables, and an incomplete data set. The specifications allow for nonstationarity, and the disturbance process of the model is specified non-parametrically. We consider various scenarios concerning the pattern of miss...

Journal: :جنگل و فرآورده های چوب 0
زهرا نوری دانش آموخته مقطع دکتری-دانشگاه تهران محمود زبیری استاد- دانشکده منابع طبیعی-دانشگاه تهران جهانگیر فقهی دانشیار-دانشکده منابع طبیعی دانشگاه تهران محمدرضا مروی مهاجر استاد - دانشکده منابع طبیعی دانشگاه تهران

this study aims at analyzing spatial pattern and associations of fagus oriantalis lipsky in different vertical classes in intact beech forests. data collection was done in 25 ha plot in gorazbon district of educational and experimental forests of university of tehran. species and dbh of all trees with dbh > 7.5 cm were recorded. the location of each tree was determined using azimuth and distanc...

Journal: :مرتع و آبخیزداری 0
یوسف نبی پور دانشجوی کارشناسی ارشد آبخیزداری، دانشکده منابع طبیعی، دانشگاه تربیت مدرس مهدی وفاخواه دانشیار، دانشکده منابع طبیعی، دانشگاه تربیت مدرس

rainfall spatial analysis methods are very helpful since there are not enough rainfall gauge stations and watersheds are scattered in large extent. there are many different methods for estimating average precipitation such as; arithmetic method and thiessen polygon. however, the arrangement and location of data and their correlations are not considered by classic methods. thus, geostatistical t...

2006
Diansheng Guo

This paper views the movements of people among locations as a spatial interaction problem, where locations interact with each other via shared visitors. The purpose of this research is to analyze the general characteristics of such spatial interactions and propose a strategy to explore and visualize such a large volume of data and reveal important patterns. The proposed strategy combines cluste...

Journal: :جغرافیا و توسعه ناحیه ای 0
رفیعیان رفیعیان تاجدار تاجدار

it is a serious point to put sustainability into effect with the intention of healthy environment. health, according to the united nation development program (undp) is one of the important indicators which shows development level in each country. health is extremely meaningful and is associated with a great part of urban and regional planning policies as a main aspiration. it also contains many...

Journal: :The Journal of the Institute of Webcasting, Internet and Telecommunication 2013

2002
Ruifang ZHAI Chengda LIN Li YAN

On the basis of analysing the theories of object-oriented, topological relation model and non-topological relation model, this paper presents a new spatial data model. The thinking of new data model accords with the theory of spatial organization. It has its own characteristics compared with conventional data model. All of these ideas have been embodied in factual appliance of spatial analysis,...

Extended abstract   1- Introduction Coastal environments are one of the most sensitive environmental systems under the influence of dominant hydrodynamic processes. Coastal changes and evolution are occurring very fast. Coastal areas are now gradually becoming known as severe natural and man-made disturbances, including sea levels rising, coastal erosion and sedimentation, and over-exploitat...

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