mapping and visualising census data keith cole jackie carter geo-data forum - 4/4/2001
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Mapping and Visualising Census
DataKeith Cole Jackie Carter
Geo-data forum - 4/4/2001
2
Overview of presentation
Existing barriers to use Providing integrated access to Census
Area Statistics and associated digital boundary data over the web (Casweb)
Exploring/visualising Census Area Statistics over the web (Descartes)
Future Developments Demonstration
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MIMAS and the Census Dissemination Unit
(CDU) Manchester InforMation and Associated Services
– http://www.mimas.ac.uk/
CDU - http://census.ac.uk/cdu/
JISC/ESRC funded CDU provides:
– Support and dissemination for 1981 and 1991 Census of Population data
– Development of custom software tools
– Derived datasets
– Specialist support and training
– Currently ~ 3000 registered users
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Census Area Statistics
The UK Census provides the most comprehensive socio-economic data source for evidence-based research
Main output is the Census Area Statistics (SAS/LBS)– aggregated data for a range of spatial units
– counts of persons and households
– pre-defined cross-tabulations
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SAS/LBS tables
24 questions asked in 1991, 20,000 counts produced for area statistics
SAS LBS
No. tables 86
(less detail)
99
(more detail)
Spatial unit
Enumeration district
Ward
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Barriers to Use
Requires knowledge of the structure of the Census Area Statistics tables and geographical units
Registration Use of specialist data retrieval software
(pre-Casweb) Data handling skills to combine Census
data with boundary data in mapping software
Counties/Regions
Census geography
Counties
Counties
Districts
Counties
Districts Wards
Counties
Districts Wards
EDs
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Pre-defined Cross TabulationsLBS table 6 – Ethnic Group
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Casweb
Census Area Statistics on the Web - http://census.ac.uk/casweb/
Features– Intuitive web interface with 3-step
selection process
– List and map based selection options
– Outputs boundaries integrated with the Census data
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Casweb’s 3 step selection process
1. Select area - from map or a list
2. Select tables
3. Select variables from tables
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Download data
Text format
Mappable format– ArcView
– MapInfo MIF/MID
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Census Area Statistics: text format
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Census Area Statistics: mappable format
Census data Crown copyright
Boundary data copyright Ed-Line Consortium
Unemployment – Tyne and Wear
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Combining Census Area Statistics and OS data
from Digimap
Byker
Pelaw
Heaton
Walker
Dunston
Felling
WALLSEND
Gosforth
LONGBENTON
NEWCASTLE UPON TYNE
Census data © Crown copyright
Boundary data © copyright Ed-Line Consortium
OS data © Crown Copyright Ordnance Survey. An EDINA Digimap/JISC supplied service
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Descartes
Web based data exploration tool written in Java
Supports visual exploration of spatially referenced datasets (such as the Census Area Statistics) – use the map as a ‘thinking tool’
Developed at the German National Research Centre for Information Technology (GMD) (Bonn)
Collaboration between GMD and MIMAS established in 1997
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Descartes developments
Descartes available online at http://www.mimas.ac.uk/descartes/
Demonstrator dataset (Leics) and county/region datasets for registered users
Casweb/Descartes Integration (CHCC Project)– Part of JISC 5/99 CHCC Project
– Simplified Interface to Descartes
– Temporal visualisation (1971 – 2001)
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Demonstration
Descartes best illustrated by demonstration
Online visualisation of unemployment data for Tyne and Wear
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Further information
CDU website http://census.ac.uk/cdu/ General census information Details of registration procedures Search facilities Glossary Census Learning and Teaching Project
http://www.chcc.ac.uk/
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