Transcript Web Server
An Overview of Internet Mapping Technology Charlie Crocker Vice President Farallon Geographics, Inc. Why Mapping on the Internet? Ideal environment for collaboration and distribution of spatial information. Internet Mapping Benefits Proven collaboration environment Makes spatial data accessible to nontechnical people Allows for centralization of data, application code, and security Simplifies software and application code versioning and upgrades Provides the lowest cost for distributing and collecting spatial data Example: DOC Seismic Hazard Mapping DOC Mandate Data distribution Realtors Insurance Co. Researchers Others Public access Data consolidation Multiple formats Data sharing enhances collaboration Web Server Application Code Internet Map Server Data/Database Web Browser Internet Mapping Components Presentation Tier Web Browser Web Browser HTTP HTTPS Web Browser Web Browser World Wide Web Web Server Business Logic Tier Application Code Map Server Data Tier Files RDBMS Web Server Web Server Application Code Internet Map Server Data/Database Web Browser Sets up communication btw client and your applications: spatial server, databases, file servers, remote resources Manages, requests, responses, and authentication Runs server side code or calls compilation engines Keyhole to network; security holes start here Many options depending on operating system Examples: IIS, Websphere, Apache, others Web Server Application Code Internet Map Server Data/Database Web Browser Internet Mapping Components Presentation Tier Web Browser Web Browser HTTP HTTPS Web Browser Web Browser World Wide Web Web Server Business Logic Tier Application Code Map Server Data Tier Files RDBMS Application Code Web Server Application Code Internet Map Server Data/Database Web Browser Processes users input Calls IMS and other objects Generates wrappers Produces dynamic response that is sent by web server to the client Use Wizards to generate code for simple websites Custom code to support specific workflows Examples: ASP, JSP, JAVA, .NET, C++, etc. Web Server Application Code Internet Map Server Data/Database Web Browser Internet Mapping Components Presentation Tier Web Browser Web Browser HTTP HTTPS Web Browser Web Browser World Wide Web Web Server Business Logic Tier Application Code Map Server Data Tier Files RDBMS Internet Map Server Set Web Server Application Code Internet Map Server Data/Database Web Browser of compiled objects that interface between application code and spatial data Accesses spatial data Performs spatial analysis Renders web-ready map as XML, vector, or raster Examples: Web Server Application Code Internet Map Server Data/Database Web Browser Internet Mapping Components Presentation Tier Web Browser Web Browser HTTP HTTPS Web Browser Web Browser World Wide Web Web Server Business Logic Tier Application Code Map Server Data Tier RDBMS Files Database/Data files Web Server Application Code Internet Map Server Data/Database Web Browser Data Files Low web traffic volume Read only functionality Requires minimal IT support Examples: Shapefiles, Access DBs, DWGs, MID MIFS, etc. Database/Data files Web Server Application Code Internet Map Server Data/Database Web Browser Relational Databases (RDBMS) High web traffic volume Read/write functionality All the power of an RDBMS Data security Relational data models Scalability “Your application is only as good as your data.” Integration with non-spatial information (e.g. Assessor mainframe) Business rules and topology (data Integrity) Examples: Oracle, SQL Server, DB2, ArcSDE, etc. Web Server Application Code Internet Map Server Data/Database Web Browser Internet Mapping Components Web Browser Presentation Tier Web Browser HTTP HTTPS Web Browser Web Browser World Wide Web Web Server Business Logic Tier Application Code Map Server Data Tier Files RDBMS Web Browser Web Server Application Code Internet Map Server Data/Database Web Browser Provides user interface (GUI) Sends requests to web servers Processes responses: rendering html, images, and DHTML Tracks user history and user preferences Captures and processes spatial and nonspatial information Examples: Microsoft Won!! Web Browser (cont’d) Web Server Application Code Internet Map Server Data/Database Web Browser Runs registered components, objects and applets (i.e. plugins, Flash, PDF, etc.) Runs client-side scripts Validation before sever call Fewer calls to server reduces network traffic Communication with applets and plugins DHTML Leveraging Your Applications Services – access external services Web Portals – consolidate external and internal services Spatial Web Services Software components available over the web using UDDI, SOAP, GML… Insulates you from the expense of building and maintaining data and tools Significant savings of time, expense, and computer resources Example Web Services: Free services (some of Geography Network, etc.) Subscription services (ESRI, TeleAtlas, etc.) Custom services Available to both web and desktop Geocoding example Web Services Example Address geocoding Expensive (data) Dynamic (updates) Complicated HW/SW Geocoding Service Pay for usage Simple to deploy (API) Web and desktop Web services is to a developer what a well-built web mapping application is to your user base. Spatial Portals Consolidate multiple disconnected internet mapping sites and web services into one environment Enhances collaboration across the enterprise and internet No restrictions on the technologies that can be integrated (providers choose technology) Re-usable services hosted on different servers Features of applications integrated as services Simplifying Technology Internet Mapping - ideal for collaboration and distribution of spatial information. Leverage Internet Mapping using: Web Services – access external services and save money Spatial Portals – consolidate external and internal services and save money Charlie Crocker FARALLON GEOGRAPHICS, INC [email protected] (415)227-1140 www.fargeo.com