Summary
Interactive graphical tools are available in a number of statistical packages. However, none of them provide interactive tools for visual exploration of time series data that have spatial reference (spatio-temporal data), such as census data. Analysis of spatio-temporal data requires simultaneous representation of their spatial, temporal, and thematic aspects. We propose a system that combines interactive thematic maps, dynamic statistical graphics, and advanced controls for manipulating them. These components as well as interaction between them are specifically designed in order to support visual investigation of changes in data, the ultimate goal being to help users to reveal spatio-temporal trends. The suggested tools facilitate also detecting errors and anomalies in data.
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Notes
2We assure that the error reported here was really present in the data set and not artificially introduced. Data sets very often contain errors, even after careful verification. An important feature of the system is that it facilitates detecting errors in data by providing special displays and interactive tools.
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Acknowledgements
Our research is partly supported by the European Commission in projects EuroFigures — a digital portrait of the EU’s General Statistics (Eurostat SUPCOM 97, Project n. 13648, Subcontract to JRC 15089-1999-06) and SPIN! — Spatial Mining for Data of Public Interest (IST Program, project No. IST-1999-10536). Orientation of our research interests to spatio-temporal data exploration was inspired by stimulating discussions on meetings of the ICA Visualization Commission (URL http://www.geovista.psu.edu/icavis/). We are grateful to M.-J.Kraak, C.Blok and N.Emmer (ITC) for providing data and checking our hypothesis. We thank reviewers of the paper for their useful comments.
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Andrienko, N., Andrienko, G. & Gatalsky, P. Exploring Changes in Census Time Series with Interactive Dynamic Maps and Graphics. Computational Statistics 16, 417–433 (2001). https://doi.org/10.1007/s001800100076
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DOI: https://doi.org/10.1007/s001800100076