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United Nations Regional Workshop on Census Cartography and Management Lusa

United Nations Regional Workshop on Census Cartography and Management Lusaka, Zambia 8 – 12 October 2007. The Central Statistics Office Cartography Unit Mauritius Y. Buxsoo October 2007. OUR MISSION.

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United Nations Regional Workshop on Census Cartography and Management Lusa

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  1. United Nations Regional Workshop on Census Cartography and Management Lusaka, Zambia 8 – 12 October 2007

  2. The Central Statistics Office Cartography Unit Mauritius Y. BuxsooOctober 2007

  3. OUR MISSION To provide timely, relevant and reliable statistics, consistent with international principles and standards, for effective decision-making and monitoring

  4. OUR VISION To be a key provider of world-class statistical information

  5. REPUBLIC OF MAURITIUS • The Republic of Mauritius is a group of islands located in the South West of the Indian Ocean. • Total Area: 2040 Km2 • Population: 1.2 million • Population Density: 610/ Km2(One of the world’s highest)

  6. Location of Mauritius

  7. CENSUS HISTORY • 1st population census dates back to the 18th century (year 1735) • CSO was established in the year 1948 • The last census was carried out in the year 2000 • The next census is planned for the year 2010 Census is conducted according to provisions of the Statistics Act

  8. CARTOGRAPHY UNIT - History • The Cartography Unit was set up in the mid 1970’s • Computerization of the unit started end of 1998 • GIS was introduced in October 2002

  9. CARTOGRAPHY UNIT Director Division 3 Deputy Director Principal Statistician Cartography Unit 1 Senior Statistical Officer 5 Statistical Officer

  10. CARTOGRAPHY UNIT What do we do? • Prepare, update and produce Enumeration Area (EA) maps for censuses & surveys • Carry out field work to update existing maps • Assist in the preparation and conduct of censuses and surveys • Prepare Primary Sampling Frame for surveys • Estimation of population & households data relating to regions • Produce thematic maps and migration analysis report • Create spatial database using GIS applications

  11. Mapping Activities Mapping activities of the unit: • Digitize base maps (dated 1997) purchased from Ministry of Housing and Lands • Boundaries of all administrative boundaries have been digitized on a different layer in AutoCAD and subsequently translated to MapInfo to produce thematic maps • Boundaries of all EAs (of lower spatial level) have been digitized in AutoCAD • Land features such as roads, rivers, street names etc, each kept on separate layers, for EA maps are currently being digitized in AutoCAD and are expected to be completed by end of 2008

  12. Our Collaborators • Ministry of Housing and Lands (MHL) is the body producing National Spatial Base Maps and provides morcellement maps • National Housing Development Company (NHDC)provides plans for new housing estates • Road Development Authority (RDA) provide for new road network maps • Note: Google Earth is a very important tool used to retrieve geographical information in order to update maps

  13. Updating of Maps • Updating of maps are done as follows: • Field visits carried out by officers of the unit • Digitize new morcellement and road maps obtained from MHL, NHDC and RDA

  14. Software Windows XP Professional MapInfo Professional 6.5 AutoCAD LT 2002 Hardware Specification 4 Pentium IV PCs(2.0+ MHz ) 3 PCs of 256 MB RAM and 1 PC of 512 MB RAM 40 GB Hard Disk 4 CD-ROM drive (52x) 2 Printers, 1 Photocopier and 1 Plancopier 1 Plotter Tools

  15. Why AutoCAD and MapInfo AutoCAD • It is currently being used by MHL, NHDC and RDA, thus enabling trouble-free sharing of data among all collaborators • It is a very powerful and precise CAD tool for drawing • It can be easily imported from MapInfo • Note: It has poor analytical possibilities • It is being used to produce EA maps MapInfo • It is a GIS software efficient in geographical analysis • It is very user friendly • It can import AutoCAD drawings easily • Note: It has poor drawing capabilities as compared to AutoCAD • It is being used for analytical purposes

  16. GEO-CODE The coding system of the EAs is of a hierarchical nature and comprise of six digits. • 1st digit represents ISLAND • 2nd digit represents DISTRICT • 3rd & 4th digits together represent TOWNS & WARDS (MCA) or VILLAGE COUNCIL AREAS (VCA) • Last 2 digits represent EA within the MCA or the VCA Example of an EA 131505

  17. GEOGRAPHICAL AREA HIERARCHY STRUCTURE Republic of Mauritius Island of Mauritius (1) Island of Rodrigues (2) Island of Agalega (3) 9 Districts (Historical Boundaries) 5 MCAs (Urban) 124 VCAs (rural) 14 Zones (Rural) 20 Wards 2108 EAs 1364 EAs 93 EAs 1 EA

  18. Types of Map Produced The unit produces 2 types of maps: • Field work mapping EA maps in digital format • Dissemination maps (Thematic Maps) published in : • Population Distribution and Migration Analysis Report 2002 • Relative Development Index report 2002 • Census Atlas (not yet published)

  19. Needs and Use of Map Maps are needed: • Data Collection • Planning operations • Presentation and Analysis • To set up census and survey workloads • To estimate travel time and cost • To identify segments for sample surveys • To ensure complete coverage of an area without omission or duplication

  20. CARTOGRAPHY UNITOriginal map from MHL

  21. CARTOGRAPHY UNITMap updated by the CSO

  22. EA Map

  23. Location Map

  24. Administrative Regions Map of Mauritius showing all the MVCAs* with their respective codes. *MVCAs – Municipal & Village council Areas

  25. MASTER FRAME

  26. Future Initiatives CSO • To use GIS in national surveys and censuses (sample design, workload, allocation, spatial analysis etc..) • To adopt the web as part of the dissemination strategy through integration of interactive maps • To enhance the quality and the presentation of the EA maps and thematic maps through the use of GIS • To relate the socio demographic and economic characteristics to the housing and living conditions of the population by merging records of the Housing and Population Census enabling a more comprehensive analysis of the census data • To capture census and survey through OCR/ICR. The latter is a proven technology that could make significant cost, timeliness and accuracy improvements in censuses and surveys

  27. Future Government ProjectsIn Collaboration with the International Services Landgate, Government of Western Australia • To set up a CADASTRE OF THE ISLAND OF MAURUTIUS by THE ESTABLISHMENT OF A LAND ADMINISTRATION,VALUATION AND INFORMATION MANAGEMENT SYSTEM (LAVIMS) • Main objectives : • Establish an efficient and cost-effective administration and information • system that is an online and dynamic cadastre; and • Set up a general valuation roll of some 3000,000 residential properties • (land parcels) • “Land Management Scrutiny Mission Final Report” published on the GOM / MHL website at: http://www.gov.mu/portal/site/housing

  28. Attributes of the cadastre and ownership databases and LIS • Every land parcel (LOT) on the island would be uniquely identified and digitally mapped • All cadastral lots would be held in a fully functional and secure digital cadastral database (DCDB) • The cadastre would have an overall geo-spatial accuracy, expressed in terms of WGS 84 and / or UTM as is planned for Mauritius • It would be a Geographic Information System (GIS) environment, capable of supporting migration to a web-enabled land information system (LIS); • It would be able to be spatially improved over time by introducing survey • accurate and coordinated cadastral surveys into the cadastral system • Each land parcel would be linked to the owners deed for the parcel • Tracking of land transactions (sales, subdivisions, mortgaging (transcriptions) • Deeds lodgements and searching processes to be automated • Searching is able to be conducted on the Owners Name, Street, Deed number, State land identifier number, the Land Survey (LS) Number, and via a lot shown on the digital cadastral database

  29. Change of Datum and Map Projection • The current coordinate system of Mauritius (geodetic datum) is Clarke 1880 Spheroid • The map projection is Lambert Conical Orthomorphic projection • established in 1934 by Captain Sanseau • For better precision, the MHL has agreed to consider changing the • datum to the World Geodetic System (WGS84) and to move to Universal Transverse Mercator (UTM) map grid 84 • Note: The Global Positioning System (GPS) uses the World Geodetic System 84 • Problems • With this change the current system will face technical problems. The existing data would need transformation before laying on the new coordinate system and map projection for Mauritius.

  30. Shift due to differences between Clarke80 and WGS84 at a particular point Le Pouce, Mauritius Le Pouce (Clarke80) 57.5218o E -20.1951o S 67o 810 m dy = 337 m Le Pouce (WGS84) 57.5289o E -20.1981o S dx = 737 m

  31. Defining parameters of current map projection • Ellipsoid : Clarke 1880 • Map Projection : Lambert Conical Orthomorphic • Latitude : 20 11’ 42.25” South • Longitude : 57 31’ 18.58” East • Use of measurement : metre • Grid : Mauritius • Origin : Le Pouce • False Easting : 1 000 000 m Easting • False Northing : 1 000 000 m Northing • Scale factor at origin : 1.000 000

  32. Population Distribution Map Dot Map of Mauritius representing population distribution

  33. Population Density Map Thematic Map of Mauritius representing population density per square km

  34. Migration Streams Map of Mauritius showing net migration streams between districts for the past 5 years

  35. Birth and Death Rates

  36. Migration Streams Map of Mauritius showing net migration streams between districts for the past 5 years

  37. THANK YOU Y. Buxsoo 11 October 2007

  38. Migration Streams Map of Mauritius showing net migration streams between districts for the past 5 years

  39. Migration Streams

  40. Migration Streams

  41. Migration Streams

  42. Migration Streams

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