Geo APIs
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This document discusses geospatial APIs and mapping libraries. It introduces some major geospatial APIs from Google, Bing, and Here that provide map data and services. It also describes two popular mapping libraries - Leaflet and OpenLayers. Leaflet is easy to use but less flexible, while OpenLayers is more powerful but more complex. The document also discusses how geospatial data isn't limited to maps and can include data that references locations, and describes technologies for extracting location references from text.
Geo APIs
- 1. Geo APIs February 16th 2013 Smart Data Hack http://gogeo.blogs.edina.ac.uk
- 2. Overview •Maps in your apps •Going beyond just showing maps •Geospatial data: it isn’t just maps http://gogeo.blogs.edina.ac.uk
- 3. Back to Google, Bing and Here • These don’t just offer map data • Each service has a suite of APIs for JavaScript, iOS, Android, HTML5 etc. – https://developers.google.com/maps/ – http://www.microsoft.com/maps/developers/web. aspx – http://developer.here.net/en_GB http://gogeo.blogs.edina.ac.uk
- 4. Going beyond just showing maps
- 5. Leaflet: http://leafletjs.com/ http://gogeo.blogs.edina.ac.uk • Easy to use • Very light weight • Not very flexible – Only uses Web Mercator projection – Only uses GeoJSON or Native layers
- 8. OpenLayers: http://openlayers.org/ http://gogeo.blogs.edina.ac.uk • Very Powerful • Open Source with a huge user community • Not so easy to use • Larger Codebase, harder to streamline for mobile devices.
- 9. OpenLayers: http://openlayers.org/ http://gogeo.blogs.edina.ac.uk
- 10. OpenLayers: http://openlayers.org/ http://gogeo.blogs.edina.ac.uk
- 11. Considerations • Traffic – Google etc. have caps above which they charge • Hosted or Download? – Easier to use hosted but can be more stable to download the code • Projection and conversion – Different datasets can be in different projections – Different conversions have different accuracies • Default is usually poor! http://gogeo.blogs.edina.ac.uk
- 12. Geospatial data: it isn’t just all about maps • Most data has an element that is geospatial or can be georeferenced – Postcode, Place name, Location Stamp, IP Address • Unlock Text can dig out references from plain text – RESTful Client – Geoparser made by the LTG Here in Informatics – Outputs in GeoJSON or KML http://gogeo.blogs.edina.ac.uk
- 13. App Where’s the nearest Hotel? Enter Location Get Location from device’s GPS Unlock Places Coordinates Geonames feature type: Hotel Coordinates Unlock Places http://gogeo.blogs.edina.ac.uk • Hilton Edinburgh Grosvenor: 0.2 miles • Edinburgh residence: 0.4 miles • Holiday Inn Edinburgh North: 1.2 miles • 100 metres turn right into Princes Street • 500 metres turn left onto Hanover street • 50 metres turn left onto George Street