This document discusses various geolocation technologies including geohashing, GeoIP, HTML5 Geolocation, and distance sorting. Geohashing allows for single string representation of geographic coordinates that can be used for proximity searches and spatial indexing in databases. GeoIP determines location from IP address. HTML5 Geolocation allows websites to detect user location with user permission. Distance sorting helps order data by location.

1. Geolocation for Web
Manuel Berger - Dez 2013, Technologieplauscherl

2. 48.32926, 14.32076

3. 48.32926, 14.32076
u2d4vyh43gh

4. Compuware
u2d4vyh43gh
Dornach
u2d4vyh
Urfahr
u2d4vy
Linz
OÖ
u2d4v
u2d4

5. !
www.bigdatamodeling.org/2013/01/intuitive-geohash.html

8. Single Simple String
Representation
http://short.er/12C5kv

9. Database
•
Query on Single Index
•
Grouping Of Points
•
Zooming And Aggregation
•
Caching At Scale
•
Finding Nearest Points
!
http://www.bigfastblog.com/geohash-intro

10. Quick ’n Dirty
Proximity Search
22rt841 <-- Far way party
u2d4vyh <-- Somebody else's party nearby
u2d4vyh <-- Our party
u2d4vyh <-- Another nearby party
ub84ew3 <-- Not so close party

11. Problem!?

12. Problem!?
0
1

13. Problem!?
0
1

14. Solution!
8 surrounding
geohashes

15. Used in MongoDB and
HBase to implement
proximity searches

16. Getting Dirty
Multiple Implementations
--> See Wikipedia
Java: github.com/davidmoten/geo
!
geohash.org

17. GeoIP
127.0.0.1 = @Home

18. Getting Dirty
Multiple GeoIP-DB providers
Free: Maxmind (bit.ly/1kf6fdv)
Yep, there is a Grails Plugin ;)
(grails.org/plugin/geoip)

19. HTML5 Geolocation
JS-Part
Formerly: W3C Geolocation

20. if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(
successHandler, [errorHandler]);
}

21. if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(
successHandler, [errorHandler]);
}

22. Geolocation API Support
IE
Firefox
Safari
Chrome
Opera
iPhone
Android
9.0+
3.5+
5.0+
5.0+
10.6+
3.0+
2.0+

23. GeoIP
Geohash
Geolocation
Distance sort
Geocoding