Dear All,
Department of Computer Science and Automation
Department Seminar
Speaker : Dr. Sanjay Rana
BLOM (UK)
Title : GeoTagging Photographs
Date : Thursday, March 24, 2011
Time : 4:00 PM
Venue : CSA Seminar Hall (Room No. 254, First Floor)
Abstract
With a dramatic increase in the popularity
of cheap digital cameras and
GPS data loggers, photographs with location information are routinely
collected for various purposes such as tourist post-cards, public works
documents, newspapers, and 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)
have been recorded in a photograph. This presentation demonstrates
and discusses ideas for the generation of this geographical context,
modelling, and analysis of this information. The process of attaching the
geographical information to the photographs is called GeoTagging.
This presentation first demonstrates a process of automated GeoTagging of
digital photographs taken with GPS information. The
algorithm for
GeoTagging, at first constructs the viewshed polygon of the photograph
based on the location, azimuth and focal length information stored in the
EXIF header of a photograph. It then uses a simple overlap query between the
viewshed and features in the 'Points of Interests' database to collect the
tags for the photograph.
Secondly, the talk briefly presents the currently active research topic on
visualisation and mathematical analysis of these geotags, in order to
explore and identify the structure between the pieces of geographical
information (i.e. tags) for various sociological studies, similar to the
ones used in social networking.
Biography of the speaker
Sanjay is a Senior GIS Consultant at BLOM (UK). BLOM is a leading European
service provider within acquisition, processing and modelling of
geographic information. Before joining BLOM in 2008, during 1999-2008
Sanjay carried out
research and teaching at the University College London,
where he also received his PhD in Geographical Information Science. He
started his academic career in 1991 studying Geology at the University of
Delhi. However, in 1997, attracted by the lure of its technical computing
and uniqueness in India at that time, he moved to the field of
Geographical Information Science and specially focussed on Digital Terrain
Modelling, Visibility Analyses in Urban and Natural Environments, and
Application of Virtual/Augmented Reality in Geovisualisation. He currently
lives in Cheddar, a little village located in the southwest region of
England called Somerset. Cheddar is famous for its gorge, prehistoric
caves, cheese and cider.
Host Faculty : Dr. Vijay Natarajan
ALL
ARE WELCOME
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