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CARTOGRAPHY UNIT by mnOOiaY

VIEWS: 19 PAGES: 43

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


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)
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                   Hardware Specification
 Windows XP Professional  4 Pentium IV PCs (2.0+ MHz )
 MapInfo Professional 6.5  3 PCs of 256 MB RAM and 1
 AutoCAD LT 2002            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                                  MapInfo
   It is currently being used by MHL,      It is a GIS software efficient in
    NHDC and RDA, thus enabling              geographical analysis
    trouble-free sharing of data            It is very user friendly
    among all collaborators                 It can import AutoCAD drawings
   It is a very powerful and precise        easily
    CAD tool for drawing
   It can be easily imported from           Note: It has poor drawing capabilities as
    MapInfo                                  compared to AutoCAD
    Note: It has poor analytical
    possibilities

                                          It is being used for analytical
 It is being used to produce EA
                                             purposes
    maps
                    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                         Island of      Island of
           Mauritius (1)                    Rodrigues (2)   Agalega (3)

            9 Districts
        (Historical Boundaries)




5 MCAs                      124 VCAs          14 Zones
 (Urban)                          (rural)       (Rural)


                                  2108
20 Wards
                                  EAs

 1364
                                               93 EAs          1 EA
 EAs
          Types of Map Produced

The unit produces 2 types of maps:

1. Field work mapping EA maps in digital format
2. 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 UNIT
 Original map from MHL
CARTOGRAPHY UNIT
Map 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
          PRIVATE                         U/R/S20
EA CODE                 Population                  PSU                    LOCALITY
            HH                              02
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 Projects
      In 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

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


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



        67o
          dy = 337 m




                                              Le Pouce
                                              (WGS84)
                                              57.5289o E
                       dx = 737 m
                                              -20.1981o S
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
                        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 Streams
                    Map of Mauritius
                    showing net
                    migration streams
                    between districts
                    for the past 5
                    years
THANK YOU
         Y. Buxsoo
       11 October 2007
Migration Streams
                    Map of Mauritius
                    showing net
                    migration streams
                    between districts
                    for the past 5
                    years
Migration Streams
Migration Streams
Migration Streams
Migration Streams

								
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