webgis portal

On the design and realization of webgis principle from the bottom (II.): Exploring the essence, webgis the map of the front-end map Display scale conversion principle naaovegi ... Article Source: http://www.cnblogs.com/naaoveGIS/Hits: 2453 Updated: 2014-9-12Summary:Before I took the trouble to tell you a lot of this section of the topic, now to the point, we began the series of the first problem, map scale

[Author: Zhu Weining Huang Xingyuan Ma Jinsong posted from: Nanjing University hits: 247 updated: Article entry: Ken] Abstract: This paper discusses the technical difficulties faced by WebGIS and the concepts and features of XML, a new Web language. It aims to illustrate the advantages and good development prospects of XML application in WebGIS, taking the three-layer architecture solution of

Portal Functions A solution should not just work, it should work for you. The award-winning liferay portal stands out as an appropriate balance, practical features, availability, and technological innovation. Portal website Content Collaboration and Society Simplified user interface development Liferay portal simpl

theoryFirst, I would like to ask a few questions first:(1) In Webgis, is the topographic map itself raster or vector data?(2) When the user needs to interact with the layer, such as the need for the layer to respond to the Click event, return the attribute at the click, when the layer is displayed with the data of the grid, or vector data?(3) It is necessary to determine the topological relationship of two layers, such as determining which houses in

Internet-based geographic information system (GIS) is often called Web-GIS. This is mainly because most client applications use the WWW protocol. As technology advances, the client may adopt new application protocols, which are also considered as Internet GIS.1. WebGIS is a product of the combination of web technology and GIS technology. It is a new technology that uses Web technology to expand and improve geographic information systems.2. Because HTT

OverviewThe development of Internet technology, especially the appearance of online map, and the rapid penetration of lbs technology in all aspects of network and life, have led to the rapid development of the previously tepid Geographic Information system (GIS) industry. At present, the project scale of GIS industry is also expanding continuously. Includes basic map service function, software system with related industry business management, data management ability many will soar to tens. The t

1.3. WebGIS details With the development and popularization of Internet technology, GIS and WWW have been combined to form the so-called WebGIS (also known as Web GIS), which has become one of the most important directions in GIS development, it is also the focus and core content of this book. 1.3.1. WebGIS-special web applications Program "

admire Google's design: poi data is often updated, while basic data (Framework dataset, such as high-level roads, bridges, cities, lakes, etc) there are few changes. Even if some small roads change, it is very convenient to generate map patches in this range. This workload is relatively small. As mentioned above, poi data is actually dynamically generated (or static? For example, Google's Web Crawler finds a company's portal website, analyzes the co

Article copyright by the author Xiaohui Li is and the blog park, if reproduced please clearly indicate the source: http://www.cnblogs.com/naaoveGIS/1. Background informationIn general Webgis projects, the flow of the front-end presentation data is basically the first Data warehousing, Service release, and then the front-end call display. What if the user does not have a basic GIS background and needs to quickly display the local Excel or CSV files on

1. PrefaceIn the previous chapter, we learned about the nature of the raster layer in Webgis-the map image. From the second chapter to the fifth chapter, we introduce the principle and method of the map image acquisition in detail. So before designing a raster layer, we already know how the data in the raster layer is obtained, and the rest is how to implement it in a way that conforms to the object-oriented design principles.2. The process of raster

, but they bring new vigor to Web application development.ForWebGISThis kind of good user experience has always been lacking in applications. It is difficult for researchers and developers to find a proper balance between performance and user experience. This article discussesAjaxThe method is applied to the implementation of the WebGIS client to improve the user experience.AjaxClient AnalysisTraditional client AnalysisAfter years of development, the

AbstractAfter analyzing the characteristics of using SVG to express geospatial information, this article applies SVG to WebGIS. The main content of the system research is to use Asp.net and SVG technology, combined with SQL Server back-end databaseTechnologyDynamic generation of SVG graphics. Using the scripting language javascr ī PT and DOM technology, the WebGIS client functions such as map scaling, trans

WebGIS Design and Implementation Principles Dr. Hua, one of the representatives of the series 2006-2-18cheungmine1What is WebGIS?My definition is the process of requesting map data or related operations from the WWW server in the Internet field to obtain and present the map to the end user. The consensus is that the client does not need to install any plug-ins (of course, the necessary browser and XML suppo

screengeobounds changes as the map pans, zooms in, and shrinks.Referring to the third chapter of the content (our entire system, the content of the third chapter is the focus), we can know that every time we trigger the tile request, will recalculate the screen at this point coordinates the actual geographical coordinates.And, in the later chapters to discuss the Webgis function, when explaining the map translation function, we can also understand th

Statement: reprinted the famous source. Thank you. CampusWebGISDevelopment and Practice [ abstract ] : Network Geographic Information System ( WebGIS ) is currently a hot topic in GIS . This article takes "campus pass" as an example , this article discusses the application of WebGIS Technology in campus basic information, Department distribution, personnel management, and course informatio

The Oracle tutorial you are looking at is an overview of Oracle Portal and its portal development. Absrtact: Portal is a new technology in it field, it is one of the development direction of enterprise informatization work. This paper first introduces the definition and characteristics of Oracle Portal, and then expoun

what is the difference between mapguide and other WebGIS products in terms of technical features, functions, and architecture? This article mainly introduces the features of mapguide for reference. I have selected several familiar WebGIS products: mapserver (open-source project), mapxtreme (MapInfo), ArcIMS (ESRI), and ARCserver (ESRI ), compared with mapguide (open-source project. I did not apply Chinese

1. PrefaceIn the seventh chapter we know that the essence of the elements in Webgis is uicomponent, and the vector layer is essentially a canvas containing n (n>=0) uicomponent. In UIComponent's graphics, we draw a vector shape (shape) from the vector data and assign the vector Data's properties (attributes) to the uicomponent.Before we proceed with the design of feature and vector layers, it is necessary to understand these four questions(1) What is

Enterprise-level open source WebGIS solution-MapGuide (comparative analysis) What is the difference between MapGuide and other WebGIS products in terms of technical features, functions, and architecture? This article mainly introduces the features of MapGuide for reference. I have selected several familiar WebGIS products: MapServer (open source project), MapXtre

In order to better search for local information, I think of the Geographic Information System (GIS) that I just came into contact with when I graduated from college ). When I was working in Zhengzhou, the company made GPS and LBS positioning services, so I still had some knowledge about GIS systems. However, it is a desktop version of the system, using Mapx to directly operate on local map files, so the difference with Webgis is great. Although you ha