Montag
23
APR

14.15 Uhr

Geoinformatik Kolloquium:

Micro Diagrams: A Multi-Scale Approach for Geovisual Analysis of Categorised Point Datasets

Mathias Gröbe, Technical University of Dresden, Department of Geosciences, Institute of Cartography

Location-based social media from different platforms such as Twitter and Flickr increasingly serve as data source for many diverse research projects with their point-geocoded content. For analyses and visualisation, it is necessary to show distributions of categories in different scales and resolutions. The Micro Diagrams were developed as solution to map such large geospatial point datasets. For example, a pie chart shows the numerical proportion, and the size or transparency of the chart symbolises the number of records. Therefor an aggregation is necessary to create the diagrams and to map the number of values in one cluster to a visual variable like size. Depending on the aggregation type, the resulting patterns differ. It is possible to choose a convenient method that allows to work with multiple scales with a separate content zoom interaction and to carry out scale-dependent pattern analysis of multivariate point datasets. As visualisation constraint, the area that is used for the representation of the values scales with the numbers of aggregated values.

Adresse

Geographisches Institut

015

Im Neuenheimer Feld 348

69120 Heidelberg

Homepage Veranstaltung

http://giscience.uni-hd.de

Veranstalter

Geographisches Institut, Lehrstuhl für Geoinformatik

Homepage Veranstalter

www.geog.uni-heidelberg.de/lehrstuehle/gis/

Kontakt

Bettina Knorr