copyright, Open Geospatial Consortium Making Location Count Peer-to-Peer File Sharing An Answer to the SDI blues North Carolina GIS Conference February, 2009 Raj Singh, PhD Open Geospatial Consortium

OGC copyright Open Geospatial Consortium Making Location Count OGC BACKGROUND

OGC copyright Open Geospatial Consortium Making Location Count3 What is the OGC? The Open Geospatial Consortium (OGC)The Open Geospatial Consortium (OGC) –Not-for-profit, international standards development consortium –375+ industry, government, and university members Specification Development Program (since 1994)Specification Development Program (since 1994) –Significant interaction with other standards consortia –Class A liaison with ISO/TC211 Interoperability Program (since 1999)Interoperability Program (since 1999) –A global, innovative, hands-on engineering and testing program designed to accelerate interface development and bring interoperability to the market Outreach and Community Adoption Program (since 2002)Outreach and Community Adoption Program (since 2002) –Awareness raising, education and training, encourage take up of OpenGIS® specifications, business development Mission To advance the development and market adoption of open standards for geospatial interoperability.

OGC copyright Open Geospatial Consortium Making Location Count4 OGC Today Over 375 members from 35 countries & 6 continents –equal N. America/European membership –35+ Asia-Pacific members Eighteen approved, publicly available Implementation Specifications, with additional standards profiles, and best practice documents… Broad participation with other industry and international standards organizations 20+ candidate Implementation Specifications in work OGC Reference Model defines interoperable geo architecture

OGC copyright Open Geospatial Consortium Making Location Count TODAY’S SPATIAL DATA INFRASTRUCTURES

OGC copyright Open Geospatial Consortium Making Location Count Portals for data download

OGC copyright Open Geospatial Consortium Making Location Count Google Earth with KML

OGC copyright Open Geospatial Consortium Making Location Count Web Map Server Web Coverage Server Web Feature Server With OGC web services, an analyst or operator can dynamically access that data which is relevant to the task at hand, directly from the authoritative data steward, using a variety of tools. OGC Web Services 8

OGC copyright Open Geospatial Consortium Making Location Count Its all client-side integration! visual only you get the latest copy of the data, and that’s it if you modify, you’ve lost the connection to the data the reality is… –people want to “get” the data –then “work” with it (subset, simplify, process) –but keep their working copy in sync with updates from the original data provider So…we could let everyone figure out how to handle this problem on their own, but why not do it once for all?

OGC copyright Open Geospatial Consortium Making Location Count THE WEB IS AN INFORMATION INFRASTRUCTURE

OGC copyright Open Geospatial Consortium Making Location Count File Sharing? Great way to distribute large files Does it work for GIS? NO! Good for files that never change –songs –movies –maybe imagery…

OGC copyright Open Geospatial Consortium Making Location Count XMPP? Extensible Messaging and Presence Protocol, a set of open technologies for instant messaging, presence, multi-party chat, voice and video calls, collaboration, lightweight middleware, content syndication, and generalized routing of XML data. XMPP PubSub protocol enables XMPP entities to create nodes (topics) at a pubsub service and publish information at those nodes; an event notification (with or without payload) is then broadcasted to all entities that have subscribed to the node. Pubsub can serve as the foundation for a wide variety of applications, including news feeds, content syndication, rich presence, geolocation, workflow systems, network management systems, and any other application that requires event notifications.

OGC copyright Open Geospatial Consortium Making Location Count OpenSocial The OpenSocial API supports –adding and removing friends –adding and removing apps –storing activities –retrieving activity streams for self and friends –storing and retrieving per-app and per-app-per-user data

OGC copyright Open Geospatial Consortium Making Location Count Why is OpenSocial important to us?

OGC copyright Open Geospatial Consortium Making Location Count Atom Publication Protocol …for publishing and editing Web resources belonging to periodically updated websites. The protocol at its core is the HTTP transport of Atom-formatted representations. The Atom format is documented in the Atom Syndication Format (draft-ietf-atompub-format-06.txt).

OGC copyright Open Geospatial Consortium Making Location Count GEO-SYNCHRONIZATION

OGC copyright Open Geospatial Consortium Making Location Count How GeoSync works A Server publishes 2 things: –a Web Feature Service (the latest data set) –a “change feed” A Client: –queries the WFS once for the data it wants –then queries the change feed for updates

OGC copyright Open Geospatial Consortium Making Location Count spatial database “Big” data requests vs. update requests WFS adapter WFS client WFS request: give me all the parcels in town X spatial database GeoSync adapter GeoSync client GeoSync request: give me all changes to the parcels in town X since time T new data change log

OGC copyright Open Geospatial Consortium Making Location Count Implementation in CGDI Pilot

OGC copyright Open Geospatial Consortium Making Location Count The Draft GeoSynchronization Spec OGC® Loosely Coupled Synchronization of Geographic Databases in the Canadian Geospatial Data Infrastructure Pilot