slide1 l.
Skip this Video
Loading SlideShow in 5 Seconds..
United Nations Regional Workshop on Census Cartography and Management Lusa PowerPoint Presentation
Download Presentation
United Nations Regional Workshop on Census Cartography and Management Lusa

Loading in 2 Seconds...

play fullscreen
1 / 43

United Nations Regional Workshop on Census Cartography and Management Lusa - PowerPoint PPT Presentation

  • Uploaded on

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.

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
Download Presentation

PowerPoint Slideshow about 'United Nations Regional Workshop on Census Cartography and Management Lusa' - baka

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

United Nations Regional Workshop on Census Cartography and Management

Lusaka, Zambia

8 – 12 October 2007


The Central Statistics Office

Cartography Unit


Y. BuxsooOctober 2007



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



To be a key provider of world-class statistical information

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)
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

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
cartography unit


Division 3

Deputy Director

Principal Statistician

Cartography Unit

1 Senior Statistical Officer

5 Statistical Officer

cartography unit10

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
mapping activities
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
our collaborators
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
updating of maps
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

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

why autocad and mapinfo
Why AutoCAD and MapInfo


  • 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


  • 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
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

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

types of map produced
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)
needs and use of map
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
administrative regions
Administrative Regions

Map of Mauritius showing all the MVCAs* with their respective codes.

*MVCAs – Municipal & Village council Areas

future initiatives cso
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
Future Government ProjectsIn Collaboration with the International Services Landgate, Government of Western Australia
  • 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:
attributes of the cadastre and ownership databases and lis
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
change of datum and map projection
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.
shift due to differences between clarke80 and wgs84 at a particular point
Shift due to differences between Clarke80 and WGS84 at a particular point

Le Pouce, Mauritius

Le Pouce (Clarke80)

57.5218o E

-20.1951o S


810 m

dy = 337 m

Le Pouce (WGS84)

57.5289o E

-20.1981o S

dx = 737 m

defining parameters of current map projection
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
population distribution map
Population Distribution Map

Dot Map of Mauritius representing population distribution

population density map
Population Density Map

Thematic Map of Mauritius representing population density per square km

migration streams
Migration Streams

Map of Mauritius showing net migration streams between districts for the past 5 years

migration streams36
Migration Streams

Map of Mauritius showing net migration streams between districts for the past 5 years



Y. Buxsoo

11 October 2007

migration streams39
Migration Streams

Map of Mauritius showing net migration streams between districts for the past 5 years