Abstract

An Online Service for Automated Geotagging of Digital Photographs
Track: Telecommunications and Location-Based Services
Author(s): Sanjay Rana, Thierry Joliveau

With the advent of cheap digital cameras, photographs are routinely collected for various purposes such as tourist post-cards, public works documents, newspapers, even at regular intervals for historical records. These collections

of photographs are stored in dedicated photographic-database software, which generally do not provide the geographical context of the photograph thus it remains unknown exactly which parts of environment (i.e. buildings, streets, rivers, hills, so on) of the have been recorded in a photograph. This paper will demonstrate an online service for automated geo-tagging of digital photographs taken with GPS cameras. The algorithm for geo-tagging, at first constructs the 3D viewshed polygon of photograph based on the location, azimuth and focal length information stored in the EXIF header of a photograph. The service then uses a simple overlap query between the 3D viewshwd and features in the 'Points of Interests' database to collect the tags for the photograph.

Sanjay Rana
University College London
Centre for Transport Studies
Gower Street
London , London WC1E 6BT
United Kingdom
Phone: 00442076797873
E-mail: s.rana@ucl.ac.uk

Thierry Joliveau
Université Jean Monnet - Saint-Etienne
CRENAM-ISIG CNRS/UMR 5600
6 rue Basse-des-Rives
Saint-Etienne Cédex 02 , London 42023
France
Phone: 0033477421925
E-mail: thierry.joliveau@univ-st-etienne.fr