The realm of geographical data sets and GIS applications may seem a bit difficult to understand in a world that talks about open source and global environmental phenomena.
在谈到有关开源和全球环境现象时，很难让人联想到地理数据集和GIS应用程序领域。
Today, programmers can access a whole continuum of open source GIS applications, largely developed on UNIX and Linux systems.
目前，编程人员能够访问整个开源GIS应用程序在很大程度上依赖于UNIX和Linux 系统。
Analyzing the source of spatial data and improving the quality of spatial data are the precondition of building GIS.
分析空间数据来源、提高空间数据质量是建立地理信息系统的前提。
Digital raster graphic(DRG) and digital line graphic(DLG) are two digital maps that can be taken cheaply, and DLG is a commonest data format now, it is the main data source of GIS.
数字栅格图和数字线划图是可以低成本获取的两种数字地图，而DLG是目前最普遍的矢量数据格式，是GIS的主要数据来源。
In this paper, taking TM image as information source and taking use of GIS, the urban land expansion of Nanchang city, Jiangxi province was analyzed.
TM图像以其“综合性、多波段、多时相、信息更新快、成本低”等特点，已成为资源与环境监测中主要技术手段。
On the base of data from GIS and survey of study area on the spot, non-point source pollution load model of study area was constructed.
根据研究区域GIS数据信息及实地踏勘信息，借鉴国内外相关研究的模型模拟参数，在对研究区域进行概化的基础上，建立研究区域的非点源污染负荷模型。
Since distributed spatial database will be the main data source of Internet GIS, we have to cope with the intercommunication between heterogeneous databases and systems.
随着空间数据获取能力的飞速发展，分布式存储管理的空间数据库将成为网络GIS的主要数据源。
The structure and function of tourism GIS was designed by analyzing the object, the user 'demand and the source of data.
应用系统工程理论和方法，通过对系统目标、用户需求、数据源的分析，进行旅游GIS结构与功能设计。
CAD data are a main data source of GIS, and many problems will come forth when they are converted into GIS format, including losing block information, or point feature changed.
CAD数据作为GIS的一种主要数据源，转换为GIS格式后将出现图块信息丢失或点要素性质改变等问题。
GIS played an important role in this field by its good function of multi-source data integration, spatial analysis and decision-aiding.
GIS提供的多源数据集成能力、强大的空间分析能力和辅助决策能力在公共安全的预警预报、监测、灾情评估中发挥了重大作用。
The significant roles of quick band-change in multi-source GIS are illustrated.
说明快速换带在多源gis中的重要作用。
The method integrates GIS, RS with pollutant loading receptor response model for reservoir water, agricultural non point source pollution simulation model and linear programming model.
该方法运用遥感数据，并以地理信息系统软件为平台集成了水库营养盐负荷浓度响应关系模型、农业非点源污染模拟模型和线性规划模型。
Geographic information system (GIS) is an important tool for the study of coastal erosion, its Multi-source data fusion and spatial analysis play an important role to research coastal erosion hazard.
GIS具有多源的数据融合和强大的空间分析功能等特点，是海岸侵蚀灾害研究的重要手段和工具。
This paper takes the TM6 images as major information source and GIS as an assistant tool for analysis. The relationship between Shanghai road system and heat field was concerned.
以TM 6热红外遥感图像为主要信息源，以GIS作为辅助分析工具，研究了上海城市道路与热场高温区的关系和新建道路对高温区的分割作用。
Data aquisition is a basic part of GIS, and currently various map data is still the main data source of GIS.
数据获取是GIS的基本组成部件。地图数据依然是大多数GIS的主要数据源。
After analyzing the particularity of GIS data source, we give an approach and the principle of building data objects to fit for the requests of enterprise GIS.
在分析了地理信息系统(GIS)数据源特点的基础上，提出了构建符合企业级GIS要求的数据对象的原则和方法。
This paper briefly introduces the application of 3s (GIS, RS and GPS) technologies in the dynamic monitoring of soil erosion in the source area of the Danjiangkon reservoir.
主要介绍了3s技术在丹江口水库水源区水土流失动态监测项目中的应用。
This essay begins with the general introduction to GIs, which includes the source, definition, characteristics and legal qualities of GIs.
本文首先介绍了地理标志的起源、概念、特征以及法律属性。
Through analyzing the dangerous of water source pollution, the paper brings forward the necessity of setting up an emergency preparedness and response system of pollution source based on Web GIS.
通过分析水资源污染的危害性，提出了开发基于WebGIS的污染源预警及应急系统的必要性。
Through analyzing the dangerous of water source pollution, the paper brings forward the necessity of setting up an emergency preparedness and response system of pollution source based on Web GIS.
通过分析水资源污染的危害性，提出了开发基于WebGIS的污染源预警及应急系统的必要性。
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