1. Dissemination with GIS
United Nations Statistics Division
Workshop on Census Cartography and Management - October 2007

2. Workshop on Census Cartography and Management - October 2007
Census dissemination
A census is not complete until the information collected is made available to potential users in a form suited to their needs
The information may be:
included in published tables and reports for general distribution
produced as tables in unpublished form for limited distribution
stored in a database and supplied upon request, or disseminated online (in this case it will be available only to connected populations)
Workshop on Census Cartography and Management - October 2007

3. Census geographical units
The census provides information at any geographical level, pre-existing or user defined
Workshop on Census Cartography and Management - October 2007

4. Workshop on Census Cartography and Management - October 2007
The power of maps
Maps visually communicate a concept or an idea.
Maps are often meant to support textual information
Maps appeal to the viewer’s curiosity
Maps summarize large amounts of information concisely
Maps can be used for description, exploration, confirmation, tabulation
Maps encourage comparisons:
Between different areas on the same map: where are population densities highest?
Between different maps: is child mortality higher in the districts of province A than in province B?
Same area: where and by how much do literacy rates for males and females differ in the districts?
Between maps for different time periods: did fertility rates decline since the last census?
Workshop on Census Cartography and Management - October 2007

5. GIS provide advanced functionalities for census dissemination
Combination of:
Census database: data at any geographical level
Geographical database: geographical structure of the country + cartographic representation
Workshop on Census Cartography and Management - October 2007

6. Workshop on Census Cartography and Management - October 2007
Different Uses of Maps
Geographical selection
Direct selection of a user-defined area
Area delineation
Buffer zone
Areas of influence
Modelling: spatial smoothing
Workshop on Census Cartography and Management - October 2007

7. Geographical selection
Use this map to navigate to your area of interest by drilling down to the Geographic Areas that you require.
Workshop on Census Cartography and Management - October 2007

8. Direct selection of a user-defined area...
The user describes the area on which he needs aggregated data by clicking on the components: for example, municipalities
Workshop on Census Cartography and Management - October 2007

9. Workshop on Census Cartography and Management - October 2007
Area delineation
E.g. Interactive determination of school districts with the same number of children in each school grade by aggregating census dissemination areas
Workshop on Census Cartography and Management - October 2007

10. Workshop on Census Cartography and Management - October 2007
Buffer zone
How many people live within a 5 miles radius from the hospital ?
Workshop on Census Cartography and Management - October 2007

11. Workshop on Census Cartography and Management - October 2007
Areas of influence
Commuting distances: daily commuters flow
Workshop on Census Cartography and Management - October 2007

12. Modelling: spatial smoothing
Growth rate of the population between two censuses
Workshop on Census Cartography and Management - October 2007

13. Uses of Graphs: Enriching the Understanding of GIS Data Sets
Exploratory Spatial Data Analysis
Linked Maps, Graphs & Tables
Dynamic Feature Selection
Animation
Visualization over Time
Workshop on Census Cartography and Management - October 2007

14. Uses of Graphs - More Control
Color matching between graph and map layer
Enhanced control over all graph elements
Workshop on Census Cartography and Management - October 2007