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GIS AND CENSUS MAPPING IN ST. LUCIA

GIS AND CENSUS MAPPING IN ST. LUCIA. Presented by Sherma Lawrence. Central Statistical Office, St. Lucia. Census History - Dissemination. The previous dissemination of census results had been limited to tables and reports. Census History - Maps.

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GIS AND CENSUS MAPPING IN ST. LUCIA

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  1. GIS AND CENSUS MAPPING IN ST. LUCIA Presented bySherma Lawrence Central Statistical Office, St. Lucia GIS and Census Mapping in St. Lucia

  2. Census History - Dissemination • The previous dissemination of census results had been limited to tables and reports. GIS and Census Mapping in St. Lucia

  3. Census History - Maps • In 1980 aerial photographs were used to guide the enumerators along their designated Enumeration Districts(ED). • 1991 the aerial photographs were used in collaboration with hand drawn maps. • Subdivision of island into Enumeration Districts (approximately 100 households per unit) • Delineation project by Statistics Department to identify areas previously left out • New EDs hand drawn to scale from 1:2500 topographic map sheets. GIS and Census Mapping in St. Lucia

  4. Introduction of GIS • Reasons for the introduction of GIS at the Statistics Department: • Preparation for 2001 census • Increasing demand for updated maps • Technological initiatives • Development of human and physical resources GIS and Census Mapping in St. Lucia

  5. GIS Software • Arcview 3.0 was chosen as the first GIS software package of the Statistics Department • Simple User Interface • Great functionality • Upgrading from 3.0 through to 3.2 GIS and Census Mapping in St. Lucia

  6. GIS Software • Arcview uses prior to 2001 • Digitize topographic map sheets using heads-down digitizing • Subdividing of digital map in to Enumeration Districts using heads up digitizing GIS and Census Mapping in St. Lucia

  7. GIS Software • Creating multiple ED layouts within one project GIS and Census Mapping in St. Lucia

  8. GIS Software • Creating dot density map to represent population distribution at District level GIS and Census Mapping in St. Lucia

  9. ArcGIS Arcview ARC MAP ARC TOOLBOX (Floating Toolbar in Arc Map) ARC CATALOG ArcReader GIS and Census Mapping in St. Lucia

  10. ArcEditor GIS and Census Mapping in St. Lucia

  11. Global Positioning Systems (GPS) Why GPS?...... • Topographical maps were out dated • Inaccuracy in ED maps • Rate of national development • Need for regular updating and maintaining of Enumeration Districts. GIS and Census Mapping in St. Lucia

  12. ED Development with GPS • GPS used to update roads, footpaths and buildings. • Differential correction done with pathfinder office • Base files from Cable and Wireless Base Station • New files exported as shapefiles GIS and Census Mapping in St. Lucia

  13. Mobile GIS • Upgrade to Trimble Geo XM GPS unit • Functionality of a PDA with a high-tech GPS system • 1-2 meter accuracy • Microsoft Windows CE operating system • Terrasync Software • Arcpad software • Import Arcview project unto the unit • Realtime editing • Easy transfer from desktop to mobile unit GIS and Census Mapping in St. Lucia

  14. Updating EDs using Aerial Photos • 2004 aerial photos obtained from the Survey and Mapping Section of the Ministry of Physical Development\ • Individual images were used because of the size of the file • Inserted into Arcview as graphic • Used as a back drop for updating EDs • Too many trees in certain areas obstructed the view of houses and parts of the road • Ground truthing field trips. GIS and Census Mapping in St. Lucia

  15. Developing Settlements • During the 2001 census each building was numbered sequentially and given a unique identifier comprising the 5-digit ED number and three digit number from 001-999. • e.g. 14705042 would be ED number 14705 and building number 042 GIS and Census Mapping in St. Lucia

  16. Creating Settlement Boundaries • Buildings with the same address were grouped together using the select by attributes feature in Arcview GIS and Census Mapping in St. Lucia

  17. GIS and Census Mapping in St. Lucia

  18. Generating Settlement Codes • A unique 9 digit settlement code was developed • 2 digit district code (standard) • 3 digit main settlement number • 2 digit sub settlement number • 2 digit sub-sub settlement number e.g. Sans Souci in La Borne is 120330403 Gros Islet – Monchy - La Borne - Sans Souci 12 - 033 - 04 - 03 GIS and Census Mapping in St. Lucia

  19. Generating Settlement Codes GIS and Census Mapping in St. Lucia

  20. GIS Applications • Settlement boundaries have revolutionized the dissemination of census data within the Statistics Department. • Statistical information can now be mapped relative to the administrative boundaries used by an agency such as Health Regions, Education Districts, Political Constituencies, etc GIS and Census Mapping in St. Lucia

  21. GIS Application…..Demographics Dot Density …… • is a simple application where the value of the variable is represented by dots • In the case of St. Lucia, used to represent population count where 1 dot =200 persons GIS and Census Mapping in St. Lucia

  22. GIS Application…..Demographics Population By Settlement ….. • It is easier to disseminate demographic information at the settlement level • A Settlement map can now be provided to accompany the information GIS and Census Mapping in St. Lucia

  23. GIS Application…..Health Heath….. • Undefined boundaries • Heath Regions were developed by combining the settlement catered to by the Health Centres and Hospitals in the Regions • Reported case of Diabetes relative to the location of Health facilities by settlements GIS and Census Mapping in St. Lucia

  24. GIS Application…..Health GIS and Census Mapping in St. Lucia

  25. GIS Application…..Crime Crime…. • A K-mean Cluster Classification Analysis was performed using the results of the 2001 census to determine areas most prone to crime GIS and Census Mapping in St. Lucia

  26. GIS Application…..Crime

  27. GIS Application…..Economy Economy…. • Combined average income per household • Useful for poverty assessment, feasibility studies GIS and Census Mapping in St. Lucia

  28. GIS Application…..Elections General Elections….. • Redefining and re-digitizing of Electoral Boundaries prior to the 2001 National Elections • Subdividing or Electoral Constituencies into Poling Divisions • Providing maps for National Voter registration project • Displaying Election Results on Statistics website: http://www.stats.gov.lc/election.htm GIS and Census Mapping in St. Lucia

  29. GIS Application…..General Elections GIS and Census Mapping in St. Lucia

  30. GIS Application…..Industry Industry…. • Data entry of 2001 census visitation records • Classification based on the United Nations “International Standard Industrial Classification of All Economic Activities” GIS and Census Mapping in St. Lucia

  31. GIS Applications….Industry GIS and Census Mapping in St. Lucia

  32. GIS Applications….Web Maps http://www.stats.gov.lc/mapping_page/map_index.htm GIS and Census Mapping in St. Lucia

  33. Conclusion • The applications mentioned above are a mere demonstration of capabilities of GIS • GIS is a valuable investment and has proven to be an asset at the St. Lucia Statistics Department • GIS has positively affected the way we collect, analyze and use data GIS and Census Mapping in St. Lucia

  34. The end GIS and Census Mapping in St. Lucia

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