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, 11 30 W AREA 71,740 SQ KM POPULATION 4,976,871 (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 Localities Administrative boundaries Educational institutions Health facilities 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 CHIEFDOM SECTION EA NO LOCALITY UTM EASTINGS UTM NORTHINGS DEA BAIWALLA 01010101 TAMBEYAMA 1 316971 886981 TAMBEYAMA 2 316529 887357 JORU 317538 883776 NYANDEHUN 318742 884528
POINT DATA OF ENUMERATION AREAS
DIGITIZED EA DATA BASE (9,671 EA’S)
CENSUS DATA LINKED TO EA SHAPE FILE EA NO. DIST DIST.CODE CDOM CDOM CODE SEC SEC.CODE MALE FEMALE TOT.POP H/H 11010101 KAILAHUN 11 1101 DEA BAIWALLAH 110101 126 149 275 68 11010102 182 244 426 96 11010103 197 231 428 89 11010104 192 203 395 72
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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