INTRODUCTION TO WEB GIS

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INTRODUCTION TO WEB GIS : 

INTRODUCTION TO WEB GIS REGIL.R MTech(Remote sensing) PSNACET .Dindigul Tamil Nadu

Geographic Information System : 

Geographic Information System A computer based system capable of capturing ,storing , interpreting and displaying spatially referenced geographical data. A system of hardware and software used for storage, retrieval, mapping, and analysis of geographic data.

Slide 3: 

A GIS is a software system that connects map layers with real earth coordinates and its tables of information

GIS vs. CAD : 

GIS vs. CAD Difference between mapping software or CAD and GIS: you ask questions in GIS. Three levels of GIS applications: Inventory (What is there?) Analysis (Answering questions) Modeling (Making predictions)

Slide 5: 

GIS is not GPS GPS or Global Positioning Satellites – are a cloud of satellites that tell tracking devices where they are, These locations are often used in a GIS.

GIS and the internet : 

GIS and the internet Users quickly adopted the internet for download of large files. The World-Wide-Web (WWW) is a useful tool for the gathering and manipulation. Most information that is available in the world is now available over the Internet. Now much the same is true concerning GIS information.

Web GIS : 

Web GIS WebGIS holds the potential to make distributed geographic information (DGI) available to a very large worldwide audience. Internet users will be able to access GIS applications from their browsers without purchasing proprietary GIS software.

Web GIS : 

Web GIS The challenge of WebGIS lies in creating software systems that are platform independent and that is on any computer capable of connecting to the Internet and running a Web browser. This task is different from running proprietary GIS software over local-area networks (LANs) on just a few types of computer hardware.

Strategies employed in Web GIS : 

Strategies employed in Web GIS Server-side strategies Client-side strategies Hybrid Strategies

Server-side Strategies : 

Server-side Strategies

Server-side Strategies : 

Server-side Strategies Server-side strategies rely on the ability of users to send requests to GIS software through the Internet server. The programs that service user requests can be written in a number of widely used languages including Visual Basic and C++.  CGI (Common Gateway Interface), Java are common interface standards for allowing the Web server to communicate with needed GIS applications.

The advantages of server-side strategies : 

The advantages of server-side strategies If a high-performance server is used, users can access large and complex datasets that would be difficult to transfer across the Internet and process locally on the client. If a high-performance server is used, complex GIS analytical routines can be run quickly even by clients who lack access to sophisticated hardware.

The disadvantages of server-side strategies : 

The disadvantages of server-side strategies Every request--no matter how small--must be returned to the server and processed.  Responses must then be returned to the client across the Internet. Performance will be affected by the bandwidth and network traffic on the Internet between the server and client particularly when responses involve transferring large files. Applications do not take advantage of the processing power of the user's own "client" computer, which is used merely to submit a request and display the response.

Client-side Strategies : 

Client-side Strategies

The advantages of client-side strategies : 

The advantages of client-side strategies Applications take advantage of the processing power of the user's own computer. The user can be given greater control of the data analysis process. Once the server has delivered its response, the user can work with the data without having to send and receive messages across the Internet.

The disadvantages of client-side strategies : 

The disadvantages of client-side strategies The response from the server may involve transferring large amounts of data as well as applets, causing delays. Large and complex datasets may be hard to process on the client if it is not very powerful. Users may not have the training needed to employ the data and analysis functions properly.

Hybrid Strategies : 

Hybrid Strategies

Hybrid Strategies : 

Hybrid Strategies Hybrid solutions are also useful for certain "pay for use" and "maps on demand" applications where users would "subscribe" to make periodic or regular use of a server for data or specific types of analyses. Designing an effective hybrid solution is most effective if the designer understands in detail the audience for the WebGIS application, the capabilities of the audience's computers, the audience's knowledge of GIS applications.

Applications : 

Applications Real time map browser Map generator Spatial data catalog Geographic Information Search Engine

Conclusion : 

Conclusion Web-based GIS is becoming more and more prevalent as time passes. With Internet connections getting faster and faster, the amount of information that can be transferred over the Internet is staggering.

THANK YOU ALL : 

THANK YOU ALL

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