Having generated interactive mapping tools at Electoral Division level on the 31st of July, AIRO has expanded the CSO Census 2011 mapping toolkit to include data using the latest Small Areas boundary set.  In total 130 maps and 975 variables are available across 15 themes.

Small Area boundaries (created by the National Centre of Geocomputation at NUI Maynooth for Ordnance Survey Ireland) are considerably smaller than Electoral Divisions and offer a significantly better level of detail in terms of analysing data spatially. There are approximately 18,488 Small Area units in comparison to 3,409 Electoral Divisions. A Small Area boundary is usually comprised of approximately 80-100 households per unit and have an average size of 3.5km2. In comparison, an Electoral Division can has an average size of over 20km2. When analysing data spatially at Electoral Division level much of the detail is lost across the larger boundary area. With the Small Areas data, the user is now in a position to analyse data that in certain areas can be viewed at housing estate level.

Compare the two maps in the image below. They both contain the same data (% Population Unemployed 2011) but one is mapped at Electoral Division level and the other at Small Area. Note the increase level of detail and the differing distributions across the Dublin area. The increased level of detail allows users to identify trends and patterns in local areas that previously would have been overlooked.


How to explore Census 2011 data at Small Areas Level:

On the AIRO site go to the Census mapping module section and select the “Local Authority Module”. Choose which local authority you wish to analyse and within the map window use the “Data” button to select what Census data you wish to view and the “Change Geography” button to select Electoral Division or Small Area level geography.

Aoife Dowling and Eoghan McCarthy