United Nations Regional Workshop on

Census Cartography and Management

Lusaka, Zambia8 – 12 October 2007

The Central Statistics Office

Cartography Unit

Mauritius Y. Buxsoo

October 2007

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

OUR MISSION

To be a key provider of world-class statistical information

OUR VISION

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)

Location of Mauritius

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

Director

Division 3

Deputy Director

Principal Statistician

Cartography Unit

1 Senior Statistical Officer

5 Statistical Officer

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

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

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 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

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

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

MapInfoNote: 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

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 Agalega (3)

Island of Rodrigues (2)

Island of Mauritius (1)

14 Zones (Rural)

124 VCAs (rural)

9 Districts (Historical Boundaries)

93 EAs 1 EA

2108 EAs

1364 EAs

5 MCAs (Urban)

20 Wards

Types of Map Produced

The unit produces 2 types of maps:

1. Field work mapping EA maps in digital format2. 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

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

CARTOGRAPHY UNITOriginal map from MHL

CARTOGRAPHY UNITMap updated by the CSO

EA Map

Location Map

Administrative Regions

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

*MVCAs – Municipal & Village council Areas

MASTER FRAME

EA CODEPRIVATE

HHPopulation

U/R/S2002

PSU LOCALITY

111101 113 462 1 1006 Camp Chapelon

111102 4 18 1 1008 Bell Village

111103 36 127 1 1007 Plaine Lauzun

111104 86 365 1 1007 Plaine Lauzun

111105 107 372 1 1007 Plaine Lauzun

111106 140 570 1 1005 Camp Chapelon

111107 83 318 1 1006 Camp Chapelon

111108 89 368 1 1006 Camp Chapelon

111109 101 389 1 1002 G.R.N.W.,

111110 128 463 1 1004 G.R.N.W.

111111 67 242 1 1008 Cite Vallijee

111112 88 347 1 1009 Cite Vallijee

111113 69 251 1 1010 Cite Vallijee

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

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

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

•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

ProblemsWith 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

dy =

337

m

dx = 737 m

810 m

Le Pouce (WGS84)57.5289o E-20.1981o S

Le Pouce (Clarke80)57.5218o E-20.1951o S

Le Pouce, Mauritius

67o

Defining parameters of current map projection

Ellipsoid : Clarke 1880Map Projection : Lambert Conical

OrthomorphicLatitude : 20 11’ 42.25” SouthLongitude : 57 31’ 18.58” EastUse of measurement : metreGrid : MauritiusOrigin : Le PouceFalse Easting : 1 000 000 m EastingFalse Northing : 1 000 000 m NorthingScale factor at origin : 1.000 000

Population Distribution Map

Dot Map of Mauritius representing population distribution

Population Density Map

Thematic Map of Mauritius representing population density per square km

Migration Streams

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

Birth and Death Rates

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

THANK YOU Y. Buxsoo

11 October 2007

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

Migration Streams

Migration Streams

Migration Streams

Migration Streams