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Esri Web Applications February11 2011

Esri Web Applications February11 2011



GIS seminar presentation, Feb 11 by esri

GIS seminar presentation, Feb 11 by esri



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    Esri Web Applications February11 2011 Esri Web Applications February11 2011 Presentation Transcript

    • The Practical Aspects of Web GIS using ArcGIS Server David Crosby – Esri Jeff Smith – Esri Garima Vyas - Esri
    • Goals• Esri product history and history of web GIS• Esri model for GIS on the web• What are web services?• REST and SOAP• Esri APIs• Samples and Demonstration
    • Web GIS – Principles and Applications • Esri Press book by Pinde Fu and Jiulin Sun • Published November 2010 • Available at Amazon.com
    • Esri Web Product History • ArcView IMS Late • MapObjects IMS 1990’s • ArcIMS – early 2000 (SDE and Shapefiles) - The START of Esri web collaboration with IMS services • ArcGIS Server – around 2005 • Grown parallel to technology • ArcIMS Used ActiveX, Cold Fusion, servlets • ArcGIS Server takes advantage of SOAP, REST
    • Web GIS • Historically, GIS was mainframes, then servers and desktops – this was expensive! • The web is an ideal platform for GIS • The web allows for collaboration - Data, maps, models, computing power!
    • Mashups • Discover and search online • Mix content from different sources – through SERVICES! • Not available? Make your own content and add to others to create value-added applications • Most important thing is make data available for others
    • 1. Web Services – the Esri Approach Source: Web Applications, Principles and Applications, Esri Press 2010
    • What are web services? A method of communication between two electronic devices exposed over the Internet Clients consume remote objects and functionality Examples: - Data Providers: Yellow pages, search engine - Service Providers: Credit card authentication - GIS: map, locator, geodata, feature…services
    • How do web services work?  Two primary architectures: SOAP and REST  Requests and responses are made via HTTP protocol  Example of a typical request/response HTTP Request Web Service Web Service Client HTTP Response
    • What is SOAP? Simple Object Access Protocol XML-based protocol for accessing a web service Language and platform independent Messages are negotiated and transmitted via HTTP Used in Web ADF in Server Manager web applications
    • Sample SOAP Message HTTP Protocol SOAP Document POST /InStock HTTP/1.1 Host: www.example.org HEADER (Optional) Content-Type: application/soap+xml; charset=utf-8Delivery Info. Content-Length: nnn <?xml version="1.0"?> <soap:Envelope BODY xmlns:soap="http://www.w3.org/2001/12/soap-envelope" soap:encodingStyle="http://www.w3.org/2001/12/soap- Method Parameters encoding"> <soap:Body xmlns:m="http://www.example.org/stock"> <m:GetStockPrice> <m:StockName>IBM</m:StockName> </m:GetStockPrice> </soap:Body> </soap:Envelope>http://sampleserver1.arcgisonline.com/ArcGIS/services?wsdl
    • What is REST?  REpresentational State Transfer  Not a language, rather a design pattern  Services are exposed as resources  Resources are available on the web over HTTP  Client addresses resources via a URL
    • REST principles  Addressable resources are referenced via a URL (usually referred to as the noun)  Representations of these resources are returned in various formats, e.g. json, html, xml, etc.  Resources have operations such as PUT, GET, POST, and DELETE (usually referred to as verbs)
    • ArcGIS Server REST API  Web interface to ArcGIS Server services  Resources and operations exposed via URLs  Server catalog is a well-known endpoint  A simple view of your ArcGIS Server - .NET = http://<host>/arcgis/rest/services - Java = http://<host>:8399/arcgis/rest/services
    • ArcGIS Server REST API example• Examples http://sampleserver1.arcgisonline.com/ArcGIS/rest/services http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ ESRI_StatesCitiesRivers_USA/MapServer/export?bbox=-125,6.9,- 66.1,66.8
    • SOAP and REST Requests SOAP Request: <?xml version="1.0"?> <soap:Envelope xmlns:soap="http://www.w3.org/2001/12/soap-envelope" soap:encodingStyle="http://www.w3.org/2001/12/soap-encoding"> <soap:body pb="http://www.acme.com/phonebook"> <pb:GetUserDetails> <pb:UserID>12345</pb:UserID> </pb:GetUserDetails> </soap:Body> </soap:Envelope> REST Request: http://www.acme.com/phonebook/UserDetails/12345
    • SOAP vs. REST?  REST is lightweight whereas SOAP has more XML markup  REST potentially easier to implement  REST is generally more agile with development  REST does not require toolkits to build  SOAP adheres to rigid type checking  *Ultimately, they are both web services and that is what counts!
    • ArcGIS APIs• Web APIs - ArcGIS API for JavaScript - ArcGIS API for Flex - ArcGIS API for Silverlight• Device APIs - ArcGIS Mobile SDK – Windows Mobile Phones and Pocket PCs. - ArcGIS API for iOS - ArcGIS API for Windows Phone 7 (newer technology) - ArcGIS API for Android
    • Web Application Examples • ArcGIS Javascript API - Summit Map (2009 ESRI Mashup Challenge Winner) • ArcGIS Flex API - DTSAgile Exec Mashup (2010 ESRI Mashup Challenge winner) • ArcGIS Silverlight API - Silverlight Showcase
    • Web Application Demo ArcGIS Viewer for Flex
    • Thank you! Questions?