Archive for September, 2012

Visual Analytics for Spatio-Temporal Data

September 18th, 2012

I am starting my sabbatical year with a long overdue participation in the GIScience conference series. GIScience 2012 is taking place at Ohio State University. There was an excellent selection of pre-conference workshops today, of which I attended the one on “GeoVisual Analytics, Time to Focus on Time”, see GeoVA(t) 2012.

I presented research completed last fall by Master of Spatial Analysis student Andrew Lee under my supervision. We used a technology called “Self- Organizing Maps” to visualize changes in socio-economic status of Toronto neighbourhoods between 1996 and 2006. The presentation garnered a short but intense discussion of the limitations of the SOM technology – something to look at in future research!

Other presentations of interest introduced the “Great Wall of Space-Time”, a wall-like 3D visualization for time series data; interactive temporal zoom & pan tools using multi-touch displays; and another SOM-based cluster analysis for weather data, in which the “Multiple Temporal Unit Problem” was discussed (in analogy to geography’s well-known multiple areal unit problem). All workshop slides will be made available by the organizers at the above Web site.

50 Years of Geographic Information Systems

September 9th, 2012

Some 50 years ago, the Canadian government started the development of a computerized land inventory which would become the prototype of geographic information systems (GIS). Its early history is detailed in a blog post by leading GIS vendor ESRI at

In addition to the interesting links they provide at the end of their post, I really like the three-part documentary “Data for Decision” on the Canada GIS, which you can access via the GIS and Science blog at, or directly at (part 1).

Ryerson’s Department of Geography (formerly School of Applied Geography) has a long tradition of using GIS in research and in the classroom/lab, and thereby training a modern type of geographer and contributing to a new perspective on the study of social and earth systems.