Workshop on Census Cartography and Management - October 2007
Dissemination with GIS
United Nations Statistics Division
2010 World Programme on Population and Housing Censuses:Subregional Workshop on Census Cartography and
Management22-26 October, 2007, Port-of-Spain, Trinidad and Tobago
Workshop on Census Cartography and Management - October 2007
Census dissemination A census is not complete until the data
collected is made available to potential users in a form suited to their needs
The data 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general distribution produced as tables in unpublished form for limited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
Census geographical units The census
provides information at any geographical level, pre-defined or user-defined
Workshop on Census Cartography and Management - October 2007
The power of maps Maps visually communicate a concept or an idea Maps summarize large amounts of information
concisely Maps are often meant to support textual information 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
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
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
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
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
Area delineation E.g. Interactive
determination of school districts by looking at the number of children in each school and then aggregating census enumeration areas
Workshop on Census Cartography and Management - October 2007
Buffer zone How many
people live within a five mile radius from the hospital ?
Workshop on Census Cartography and Management - October 2007
Areas of influence Commuting
distances: daily commuters flow
Workshop on Census Cartography and Management - October 2007
Modelling: spatial smoothing Growth
rate of the population between two censuses
Workshop on Census Cartography and Management - October 2007
Uses of Graphs: Enriching the Understanding of GIS Data Sets
Exploratory Spatial Data Analysis Linked Maps, Graphs & Tables Dynamic Feature Selection Visualization over Time Animation
