CARTOGRAPHY UNIT

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United Nations Regional Workshop on
Census Cartography
and Management Lusaka, Zambia 8 12 October 2007
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The Central Statistics Office Cartography Unit
Mauritius Y. Buxsoo October
2007
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OUR MISSION
To provide timely, relevant and reliable
statistics, consistent with international
principles and standards, for effective
decision-making and monitoring
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OUR VISION
To be a key provider of world-class statistical
information
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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 worlds
  highest)

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Location of Mauritius
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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

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CARTOGRAPHY UNIT - History

• The Cartography Unit was set up in the mid 1970s
• Computerization of the unit started end of 1998
• GIS was introduced in October 2002

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

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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

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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

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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

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Tools

• 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

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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

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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

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

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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

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CARTOGRAPHY UNITOriginal map from MHL
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CARTOGRAPHY UNITMap updated by the CSO
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EA Map
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Location Map
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Administrative Regions
Map of Mauritius showing all the MVCAs with
their respective codes. MVCAs Municipal
Village council Areas
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MASTER FRAME
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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

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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,VALU
  ATION 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

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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

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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.

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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
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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
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Population Distribution Map
Dot Map of Mauritius representing population
distribution
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Population Density Map
Thematic Map of Mauritius representing population
density per square km
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Migration Streams
Map of Mauritius showing net migration streams
between districts for the past 5 years
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Birth and Death Rates
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Migration Streams
Map of Mauritius showing net migration streams
between districts for the past 5 years
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• THANK YOU
• 
  Y. Buxsoo
• 
  11 October 2007

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(No Transcript)
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Migration Streams
Map of Mauritius showing net migration streams
between districts for the past 5 years
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Migration Streams
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Migration Streams
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Migration Streams
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Migration Streams