[Nets-seminars] Guest speaker 13:00 Friday 29th July

Richard G. Clegg richard at richardclegg.org
Tue Jul 26 16:25:50 BST 2011


We have a visitor to the EE department on Friday 29th July who will be 
giving us a talk at 13:00, all welcome.  The talk will be held in the 
Barlow Room.

Jacqueleen Joubran -- Near Real Time Automated Generalization for Mobile 
Devices

The substantial amount of geospatial data in the form of digital maps 
which is available on the World-Wide Web, together with the increasing 
number mobile devices, motivates the development of modern techniques 
suitable to performing near real time applications on mobile devices. In 
this sense, geo-spatial applications are becoming a major goal to 
developing techniques and algorithms. One of these applications is the 
need to present spatial data in different resolutions and scales in real 
time. A customary approach in the last years to solving the varying map 
scale presentation was by applying a Multiple Representation/Resolution 
Database approach in order to prepare in advance digital maps at 
different scales, as generalizing the geospatial data is a time 
consuming process. Moreover, Multiple Representation/Resolution Database 
approach requires a complex updating process as all predefined maps in 
the different levels (scales) should be updated simultaneously.

A new pseudo-physical model for a real time cartographic generalization 
is introduced. The aim is to provide specific maps in real time for 
mobile devices while responding to the needs of the different users with 
their different interests to viewing the geospatial information.

The pseudo-physical model described is employed the electric field 
theory to understand and describe the action and behaviour of active 
objects in the automated digital map generalization process. The 
developed model defines several parameters that determine for each 
object a relative importance "power" in the map in real time according 
to the user needs, and set rules to control the mutual interaction 
forces between these powers in order to compromise between the 
constraints and solve the competition between the objects on the limited 
map area at a reduced scale. The parameters are different from 
cartographic purposes and they depend on the user requirements (the map 
target, and the map scale and resolution). Each object acts according to 
its relative importance calculated as its "power", computed as a 
function of its properties and these parameters. Interactions between 
map objects are expressed by actions of the forces constructed around 
the graphics presentation limitations and affected by several parameters 
depending on the presented object and the properties of the surrounding 
objects. As a result, the surrounding objects affect and cause the 
"weak" objects to change their shape, size or place. The computer 
digital implementation of this new method requires spatial data mining 
of the huge databases in order to define the implicit attributes and 
connections between the presented map objects and to visualise the 
relevant data on the websites and mobile devices screen, all in near 
real time computer algorithm.

-- 
Richard G. Clegg,
Dept of Elec. Eng.,
University College London
http://www.richardclegg.org/

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