Ben Dowling - Geomium - Building a Geo App - Geomob Feb 2011

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Ben Dowling - Geomium - Building a Geo App - Geomob Feb 2011

  1. 1. Services, Data and Architectures for Building a Geo App Ben Dowling – Geomium 10th February 2011 – GeoMob London
  2. 2. Building a simple Geo App● Lets show interesting content on a map● Where? ● At the users location ● Allow the user to search for a location● What? ● Geo-enabled APIs ● User Generated Content
  3. 3. Getting the users location● Most smartphones have built in GPS now● Determine location based on a mix of GPS, WiFi (SkyHook) and Cell tower triangulation● Will give you the users latitude and longitude● Reverse Geocoder to convert to a place name ● 51.5111,-0.1222 → 5 Southampton Street, London
  4. 4. Searching for a location● Requires Geocoding ● eg. “London” → 51.499,-0.126● Android has support for Googles service● iPhone doesnt – you can use Googles API● Alternatives: ● Flickr: gives you nearest city ● Yahoo: provides WOEIDs
  5. 5. Content● Pull content directly off the web● Lots of different content is available via APIs that support search by latitude and longitude● Such as...
  6. 6. Places● Facebook Places ● Requires the user to login● FourSquare ● Low rate limit● Gowalla ● Limited descriptions● Google Places ● Currently in beta for selected partners● Yelp ● Cant show reviews on mobile
  7. 7. Pictures● Flickr ● Lots of advanced search options● Panoramio ● Displayed on Google Maps. Takes a bounding box● PicPlz ● Includes coordinates of photos, but you cant filter by it
  8. 8. Events● Meetup● Upcoming ● XML only!● Amiando ● XML only!● Eventful ● Free for non-commercial use● Last.fm ● Non-commercial use only
  9. 9. Deals● Bview ● Good UK coverage. Not many mobile deals● Groupon ● Only a few deals per city● The Deal Map ● Mostly US based
  10. 10. People● FourSquare● Gowalla● Facebook● Twitter
  11. 11. Multiple data sources● More data by combining multiple sources● Handling duplicates ● Detection ● Merge data● Latency
  12. 12. User generated content● Have your users generate content! ● Could just be their location (eg. Friend finder app) ● Unique content (eg. Photos) ● Annotate existing content (eg. Review a place)● Need a server to store it on
  13. 13. More possibilities with a server● Single request from the mobile● Background processing● Can do duplication detection and merging on the server● Add new data without changing your app● Collect statistics
  14. 14. Thank you!ben@geomium.com @coderholic

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