共查询到20条相似文献，搜索用时 422 毫秒
1.
基于GIS的贝叶斯统计推理技术在印度野牛生境概率评价中的 … 总被引：1，自引：0，他引：1
目前,ＧＩＳ技术已被广泛应用在野生动物生境研究中。但是,作为空间数据分析和处理工具,ＧＩＳ缺乏进行启发式推理的能力。因此,与擅长于此的贝叶斯统计推理技术相结合则是解决这一问题的重要途径。以西双版纳纳板河流域生物保护区为试验区,综合应用ＧＩＳ技术和多元统计技术建立和印度野牛生境的两个逻辑斯蒂多元回归模型：趋势表面模型和环境模型,第一个模型的自变量是位置坐标,第二个模型的自变量是一组环境因子,然后应用 相似文献
2.
GIS数据采集中的坐标变换模型应用 总被引：12，自引：0，他引：12
数据采集是ＧＩＳ应用中的一项重要的基础上,本文分析屯仿真变换和相似变换模型在ＧＩＳ图像配准,数字化结果坐标校正和ＣＡＤ数据转入等数据采集过程中的应用;并特别提出了在不直接提供坐标变换功能的ＧＩＳ软件环境下,利用仿射变换模型对数字化结果实现坐标变换的方法。 相似文献
3.
数据可靠综合的可视化研究 总被引：1，自引：0，他引：1
综合不同类型的数据是地理信息系统（ＧＩＳ）的典型特征和基本要求，特别是ＧＩＳ的环境数据模型的确定和处理要求对很多不同质的数据集进行综合。这篇论文着重探讨非同质、不兼容数据的可视化问题，讨论了在一个友好的用户环境中，对多个数据组我互查询和可化的技术，以便数据综合获得更大的可靠性。 相似文献
4.
5.
虚拟GIS—GIS和科学可视化的集成 总被引：1，自引：0，他引：1
本文叙述了科学可视化技术和地理信息系统（ＧＩＳ）结合的必要性,介绍了当前这方面的研究现状,引入了虚拟ＧＩＳ这一概念,提出了一个虚拟ＧＩＳ的概略模型,并说明了虚拟ＧＩＳ与互联网络的关系。 相似文献
6.
GIS软件两个热点技术浅析 总被引：28，自引：1，他引：27
本文主要对ＧＩＳ软件领域的两大前沿技术,基于ＯＬＥ的嵌入式ＧＩＳ技术,基于Ｉｎｔｅｒｎｅｔ／Ｉｎｔｒａｎｅｔ的ＧＩＳ技术进行了一些阐述和分析,并展望了这两大技术在未来几年在ＧＩＳ领域所扮演的角色。 相似文献
7.
分布式GIS分层体系结构模型的研究 总被引：12，自引：0，他引：12
提出了一个通用的分布式ＧＩＳ的分层体系结构模型;用户界面层、应用层、应用接口层和数据服务层,给出了该模型的思想和主要特征,并结合Ｉｎｔｅｒｎｅｔ／Ｉｎｔｒａｎｅｔ环境讨论了模型的实现方法。分层分布式ＧＩＳ模型的提出可以部分地解决现有的Ｉｎｔｅｒｎｅｔ／Ｉｎｔｒａｎｅｔ ＧＩＳ存在的问题。 相似文献
8.
本文提出了符合地图综合自动化特点的地图综合分类方法，给出了ＧＩＳ环境下的地图综合过程的模型，并与传统方式的地图综合进行了比较，以期对ＧＩＳ中的地图综合有新的认识。 相似文献
9.
本文提出了符合地图综合自动化特点的地图综合分类方法，给出了ＧＩＳ环境上的地图综合过程的模型，并与传统方式的地图综合进行了比较，以期对ＧＩＳ中的地图综合有新的认识。 相似文献
10.
城市空间基础数据的生产模式与质量管理 总被引：2，自引：0，他引：2
空间基础数据是ＧＩＳ系统的重要组成部分，空间基础数据的质量影响和制约着ＧＩＳ技术的可用性，本文从满足不同用户需求的角度出发，提出了面向应用的城市ＧＩＳ空间基础数据生产的观点，给出了基于这一观点的两种数据生产模式，并就有关问题进行了初步讨论，最后介绍了通过应用实践所获得的一些认识 相似文献
11.
12.
G. Singh A. Velmurugan M. P. Dakhate 《Journal of the Indian Society of Remote Sensing》2009,37(4):573-585
India has a rich repository of flora and fauna, but the rapid decline of wildlife and threat to its habitat has been a serious
cause of concern. Hence, protected areas have been set up to achieve specific conservation objectives to facilitate timely
and reliable information on forest types and its composition, degradation status and their suitability for different species
of flora and fauna. In the present study, evaluation of tiger habitat in Corbett Tiger reserve is carried out using remote
sensing, ground and other ancillary sources and is integrated using GIS using multi-criteria model. The results indicated
that sal, mixed sal, miscellaneous forest, plantation, grassland, agriculture and scrub land are the major land use/land cover
types and majority of the study area is covered under dense forest. Tiger habitat suitability analysis showed that large proportion
of the area (51.4%) was found to be highly suitable followed by moderately suitable area (31%). Further, the correlation drawn
between range-wise suitability area and actual tiger population in Corbett Tiger Reserve CTR indicated a positive correlation
of 0.73. Disturbance to wildlife habitat, vegetation degradation and shrinking passage corridor are the major concern in CTR. 相似文献
13.
《制图学和地理信息科学》2013,40(3):153-165
With the progress of mobile GIS technology there is a great potential for adopting wireless communications and Internet mapping services for regional environmental management programs and natural habitat conservation. This paper provides an overview of a NASA-funded research project that focuses on the development of mobile GIS tools and wireless Internet Map Server (IMS) services to facilitate environmental monitoring and management tasks. By developing and testing wireless web-based map/image servers, mobile GIS applications, and global positional systems (GPS), this research created an integrated software/hardware infrastructure for a prototype mobile GIS application. The mobile GIS prototype allows multiple resource managers and park rangers to access large-size, remotely sensed images and GIS layers from a portable web server mounted in a vehicle. Users can conduct real-time spatial data updates and/or submit changes back to the web server over the wireless local area network (WLAN). This paper discusses in general the major components of mobile GIS, their current technological limitations, and potential problems during implementation. Key research agenda for mobile GIS are identified with suggestions for future research and development. 相似文献
14.
Enhancing a GIS Cellular Automata Model of Land Use Change: Bayesian Networks, Influence Diagrams and Causality 总被引：1，自引：0，他引：1
Cellular Automata (CA) models at present do not adequately take into account the relationship and interactions between variables. However, land use change is influenced by multiple variables and their relationships. The objective of this study is to develop a novel CA model within a geographic information system (GIS) that consists of Bayesian Network (BN) and Influence Diagram (ID) sub‐models. Further, the proposed model is intended to simplify the definition of parameter values, transition rules and model structure. Multiple GIS layers provide inputs and the CA defines the transition rules by running the two sub‐models. In the BN sub‐model, land use drivers are encoded with conditional probabilities extracted from historical data to represent inter‐dependencies between the drivers. Using the ID sub‐model, the decision of changing from one land use state to another is made based on utility theory. The model was applied to simulate future land use changes in the Greater Vancouver Regional District (GVRD), Canada from 2001 to 2031. The results indicate that the model is able to detect spatio‐temporal drivers and generate various scenarios of land use change making it a useful tool for exploring complex planning scenarios. 相似文献
15.
GIS Methodology for Characterizing Historical Conditions of the Willamette River Flood Plain, Oregon
Doug R Oetter Linda R Ashkenas Stanley V Gregory Paula J Minear 《Transactions in GIS》2004,8(3):367-383
Recent environmental developments have stimulated an interest in conservation and restoration of the historical Willamette River flood plain, both to protect against flooding and to provide wildlife habitat. In order to best utilize scarce resources, we characterized historical and modern river channel and flood‐plain conditions to evaluate changes and help prioritize restoration sites. Using cartographic and photographic data sources, we developed a Geographic Information System (GIS) to map active channels, side channels, islands and tributaries for four separate dates, as well as riparian and flood‐plain vegetation characteristics for pre‐European settlement and modern time periods. Coverages based on flood records and other boundaries were used to partition the flood plain into spatial subsets for analysis. The GIS allowed comparisons between historical and present conditions for a variety of environmental factors. Much of the pre‐settlement channel complexity has been removed. Total channel length in 1995 was 26% less than in 1850, with almost 58% of the river's side channels disconnected from the system. In addition, we found a 72% loss of flood‐plain forest from 1850 to 1995, since it was converted to agricultural and urban land uses. Selected river and flood‐plain variables were made available for a spatial model to prioritize potential locations for flood‐plain restoration. 相似文献
16.
17.
The graphical representation and interactive manipulation of accurate three dimensional (3D) models of reality is rapidly becoming an inescapable necessity for many applications of geographical information systems (GIS). There are many problems and difficulties that must be overcome in order to facilitate such 3D models. Can accurate measurements, at sufficient resolution and using affordable resources, be obtained? Will application software usefully process, in all aspects, models of the real world, held in full 3D? Can a topology of containment, adjacency and contiguity in 3D be integrated into the conventional procedural and recording functionality of two dimensional (2D) GIS and still provide workable spatial analysis tools? A 3D GIS applied to an urban environment should maintain a model that would typically consist of solid representations of individual buildings, roads and utilities, providing both external and internal detail, all assigned to a suitable digital terrain model (DTM). The particular 3D application considered here addresses the need for accurate reconstruction of historical urban buildings. The creation, manipulation and exploration of such models is often referred to as “virtual heritage”. Much of this paper describes an effective methodology, called the Phoenix algorithm, requiring only a single image of an urban object, for the construction of 3D models of buildings at high resolution. The development of this algorithm is discussed and the results obtained from it are compared with those obtained using traditional 3D capture techniques. An outline of further potential GIS applications is presented. 相似文献
18.
数码城市GIS中建筑物室外与室内三维一体化表示与漫游 总被引：7，自引：2，他引：7
介绍了数码城市中室外与室内场景的数据管理及可视化等关键技术，对室外与室内场景进行了综合比较，讨论了室内外场景一体化的表示思想。 相似文献
19.
An integration between a visual programming environment and GIS has been developed to create and run spatial models. The visual programming environment provides graphical objects to create flowchart-like models of spatial phenomena using GIS data. The integrated system is object-oriented and designed to lessen the technical burdens of GIS programming. The system capabilities are demonstrated using a hydrological model example, and the model execution speed is compared with an equivalent model implementation in a traditional raster-based modelling system. 相似文献
20.
数字景观模型(DLM,Digital Landscape Model)和数字制图模型(DCM,Digital Cartographic Model)是GIS和地图学中的重要数据模型,二者的混合模型一直是地理信息行业研究的热点。本文基于DLM与DCM的区别,并结合国内外学者的观点,阐述了地理信息与地图一体化模型在生产实践中的重要作用。 相似文献