Webservices Technological Evolutions. Peter Bogaert University of Ghent (Belgium) E Governement Academy 8 Geoservices 15 februari 2006 Kortrijk.
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1 Webservices Technological Evolutions Peter Bogaert University of Ghent (Belgium)
2 Van Mainframe naar een gedistribueerd GIS Geographic Informationsystems From mainframe to distributed systems by means of webservices. P. Bogaert
3 Platformevolution Time
4 Accessibility Advantages Actuality
5 Reach Advantages
6 Arpanet TCP IP: communication protocol Reach Tim Brenners Lee and the WWW High Perfomance Act + Webbrowsers users
7 Users June 94 October 95 March 97 Reach July 98 December 99 Time April 01 September January 04 May 05 October 06 Source :CyberAtlas
8 Users July 98 December 99 Bereikbaarheid Belgium April 01 September 02 Time January 04 May 05 October 06 Bron: Insites BIM I XIII
9 Users 2002 Source :CyberAtlas 2002
10 Relative number of users No Data Users 2005 Source :CyberAtlas 2005
11 Alsolute number of users No Data Users 2005 Source :CyberAtlas 2005
12 Van Mainframe naar een gedistribueerd GIS GIS and the Internet
13 Data Search and Download
14 Offer of Information
15 Data Services
16 Application Services
17 Distributed GI System Definition A distributed system is an application that runs on different computers, with different operating systems, at different locations and different connections but for the user it seems to be one system only
18 Client/Server architecture applied to a GIS Partitioning in software Presentation Logical Data
19 Client/Server architecture applied to a GIS Partitioning in software: Division point Presentation Logical Data Distributed Presentation Remote Data Access Remote presentation Distributed function Distributed database
20 Remote Presentation
21 Remote Data Acces
22 Client/Server architecture applied to a GIS Two, three, n tier systems
23 Van Mainframe naar een gedistribueerd GIS STANDARDS
24 Van Mainframe naar een gedistribueerd GIS XML
25 XML Van Mainframe Impacts naar of web een gedistribueerd services GIS XML? A language used to describe information Textual : easy to read
26 3 components Defining component XML
27 3 components Information component XML
28 3 components XML Read/Visualise component: Parser
29 Van Mainframe naar een gedistribueerd GIS Data Storage
30 GML Geography Markup Language An XML application for modelling and storing Geographic Information
31 GML Van Mainframe Impacts naar of web een gedistribueerd services GIS GML 2.0 GML 3.0 Simple features: point, line, polygon, no curves 2D GML D + Topology + complex features + temporal aspects + Reference systems + 8 times as big
32 Van Mainframe naar een gedistribueerd GIS Data Transmission
33 WMS (Web Map Service) Transmission via Images + + =
34 WMS (Web Map Service)
35 Functionalities WMS (Web Map Service) Client Data Server GetCapabilities Available Data and Metadata GetMap Image GetFeatureInfo Attribute Information
36 Client WFS (Web Feature Service) Instead of images, the data itself is sent Data Server GetCapabilities Available Data and Metadata DescribeFeatureType Data Description GetFeature Data
37 Others Catalog Service for the Web (Metadata)!!! Web Coverage Surface Web Terrain Service Styled Layer Description
38 Van Mainframe naar een gedistribueerd GIS Services Standards
39 Service Standards Van Mainframe Impacts naar of web een gedistribueerd services GIS UDDI : Universal Description, Discorvery and Integration Webservices Yellow Pages WSDL : Web Service Description Language Description of a webservice: available operations and parameters SOAP : Simple Object Acces Protocol Communication protocol for the communication between the client and the server of a webservice
40 Service Standards
41 Van Mainframe naar een gedistribueerd GIS For Free or For Fee?
42 For Free of For Fee? Webservices <> Free! Beveiliging mogelijk Copyrights en Privacy
43 Van Mainframe naar een gedistribueerd GIS Webservices : Users Professional / Non Professional?
44 Users Van Mainframe Impacts naar of web een gedistribueerd services GIS Professional Time A tailor made job Actuality Non Professional Inform Conversation Simple
45 Van Mainframe naar een gedistribueerd GIS The Medium
46 Considerations concerning the medium Client Server Architecture. Client Browser (Internet Explore, Netscape,...) Client Computer Communication Request Answer The connection Server Webserver (IIS, Apache,...) Serving Computer
47 Considerations concerning the medium Van Mainframe Impacts naar of web een gedistribueerd services GIS Client Computer: Plug ins (available / installed?) Avoid Plug ins Browsers (Netscape, Internet Explorer, Opera,?) Use Standards (HTML / DHTML) Online validation of the code via W3C Screen resolution (800x600 of 1024x768 ) Keep maps small Interactive maps can adapt to the users screen resolution Colours (256 colours or more?) Use with web save colours only (256 standard colours)
48 Considerations concerning the medium Van Mainframe Impacts naar of web een gedistribueerd services GIS The communication Does the client/server have a broadband/smallband connection How long does it take to use the service (5 seconds) World Wide Web <> World Wide Wait!!!
49 Considerations concerning the medium Van Mainframe Impacts naar of web een gedistribueerd services GIS The connection Keep the information to be sent as small possible Compression! Use interactivity! Send only the information which is asked for
50 Considerations concerning the medium Van Mainframe Impacts naar of web een gedistribueerd services GIS The serving computer: Do all systems that generate maps work on my system? (Windows, Unix, Linux, ) Do I have a strong enough computer to cope with: Number of visitors Memory Connection Maps to be generated Storage Memory
51 Conclusion Van Mainframe Impacts naar of web een gedistribueerd services GIS Technical possiblilities are available The Web : Multimedia Reach Actuality Metadata Privacy Copyrights
52 Van Mainframe naar een gedistribueerd GIS Geographic Informationsystems From mainframe to distributed systems by means of webservices Peter Bogaert Ghent University
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