Transcript CARTOGRAPHY UNIT - unstats | Millennium Indicators

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 worldclass 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?
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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:
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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
PC of 512 MB RAM
 AutoCAD LT 2002
 40 GB Hard Disk
 4 CD-ROM drive (52x)
 2 Printers, 1 Photocopier
and 1 Plancopier
 1 Plotter
Why AutoCAD and MapInfo
AutoCAD
MapInfo
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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
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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
Note: It has poor analytical
possibilities
 It is being used to produce EA
maps
 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
124 VCAs
14 Zones
(Urban)
(rural)
(Rural)
20 Wards
2108
EAs
1364
EAs
93 EAs
1 EA
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 :
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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
EA CODE
PRIVATE
HH
Population
U/R/S20
02
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
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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
(Clarke80)
57.5218o E
-20.1951o S
Le Pouce, Mauritius
dy = 337 m
67o
dx = 737 m
Le Pouce
(WGS84)
57.5289o E
-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