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

GEOGRAPHY OF SIERRA LEONE GEOGRAPHIC COORDINATES 8 30 E, W AREA71,740 SQ KM POPULATION4,976,871 (2004 CENSUS) CLIMATE DRY SEASON DEC-APR WET SEASON MAY- DEC NATURAL RESOURCES DIAMOND,TITANUM ORE,BAUXITE,IRON ORE,GOLD,CHROMITE.

DATA COLLECTION Georeferencing of urban and rural maps at scales of 1:25,000 and 1:50,000 respectfully. Printing of maps with UTM co-ordinates for use in the field. Collection of GPS (Garmin 12) co-ordinates of the following 1.Localities 2.Administrative boundaries 3.Educational institutions 4.Health facilities 5.Other social facilities eg. Churches,mosques etc.

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.

ATTRIBUTE DATA OF AN EA CHIEFDOMSECTIONEA NOLOCALITYUTM EASTINGS UTM NORTHINGS DEABAIWALLA TAMBEYAMA TAMBEYAMA JORU NYANDEHUN

POINT DATA OF ENUMERATION AREAS

DIGITIZED EA DATA BASE (9,671 EA’S)

CENSUS DATA LINKED TO EA SHAPE FILE EA NO.DISTDIST.C ODE CDOMCDOM CODE SECSEC.CO DE MALEFEMALETOT.POPH/H KAILAH UN DEABAIWAL LAH KAILAH UN DEABAIWAL LAH KAILAH UN DEABAIWAL LAH KAILAH UN DEABAIWAL LAH

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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