PRESENTATION BY STATISTICS SIERRA LEONE ON THE USE OF GPS TO DESIGN ENUMERATION AREAS: A CONVENIENT

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PRESENTATION BY STATISTICS SIERRA LEONE ON THE
USE OF GPS TO DESIGN ENUMERATION AREAS A
CONVENIENT SOLUTION FOR DEVELOPING NATIONAL
SAMPLING FRAMES
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GEOGRAPHY OF SIERRA LEONE

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DATA COLLECTION

• Georeferencing of urban and rural maps at scales
  of 125,000 and 150,000 respectfully.
• Printing of maps with UTM co-ordinates for use in
  the field.
• Collection of GPS (Garmin 12) co-ordinates of the
  following
• Localities
• Administrative boundaries
• Educational institutions
• Health facilities
• Other social facilities eg. Churches,mosques etc.

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DATA CAPTURE

• Fair drawing and demarcation of enumeration areas
  and administrative boundaries using GPS
  co-ordinates and natural features.
• Data entry of GPS co-ordinates using excel
• Conversion of GPS co-ordinates into dbase iv for
  processing in Arcview
• Scanning of map sheets using AO scanner.
• On-screen digitization of administrative
  boundaries down to EA level.
• Editing and cleaning of EA shapefile using
  ArcEditor.
• Linking of census database to EA shapefile for
  analytical planning with respect to
  health,education,agriculture etc.

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ATTRIBUTE DATA OF AN EA
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POINT DATA OF ENUMERATION AREAS
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DIGITIZED EA DATA BASE (9,671 EAS)
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CENSUS DATA LINKED TO EA SHAPE FILE
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USE OF EA DATA BASE

• National sampling frame
• Delimitation of electoral wards
• Reproduction of constituency maps
• Reproduction of administrative maps
  (District,chiefdom and sections)
• Spatial distribution of health and educational
  facilities

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