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Approaches to Determine and Represent Geographical Units, Including Geocoding, for Statistics
Presenter: Sisira Tennakoon.
BSc.(Hons.), HDC(Syr.), MSc.(GeoInfomatics)
Deputy Surveyor General – Survey
Department of Sri Lanka.
Area: 65,610 Sq.Km
2
Survey Act
The Surveyor General has been empowered by
Survey Act No.17 of 2002 - article 2(k) to
– Receive, Store, Reproduce and
Distribute
Topographic, Cadastral and Derived
maps, Remote sensed data, Aerial
photographs and other surveying and
mapping documents.
3
Local Grid Reference of Sri Lanka
200 km
200 km
500 km
500 km
Pidurutalagala Trig Stn.
• Every country has its own
local grid reference for
measurement of distances and
to show the directions.
4
Foundation Data
Su
rvey
De
part
me
nt
Co
-op
era
te
In
sti
tuti
on
s
Taxing
Utilities
Buildings
Valuation
Planning
GIS Applications
Cadastral Mapping
NSDI -
Sri Lanka
Geodetic Network
Topographic Mapping
5
1:250,000
• 4 sections
• All Sheets in Digital Form
1:50,000
• 92 Sheets
• All Sheets in Digital Form
1:10,000
• 1834 Sheets
• 1583 - 10K Sheets in Digital Form
Topographical Maps
6
Digital Topographic Database
GIS - TopoDB
1K
50K 10K
Dataset 1 :Data available for
Entire Country
Dataset 2: New series from
ALOS Satellite Images
Sheet No. 1- 39
Data available
for 86 % of the
Country
Colombo
Metropolitan Area
Only
250K Data
available for
Entire
Country
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10K National Coverage
AD_GN_Pg (GN Level boundary)
CO_Building_Pg (Buildings)
CA_Grid_Li (Cartographic Grids)
HY_Hydro_Li/Pg (Streams, Tanks)
TR_Transport_Li (Roads, Railroad)
LU_Landuse_Pg (Vegetation)
CO_Toponomy_Pt (Place Names)
TE_Terrain_Li/Pt (Contour, Spot Heights)
UT_Utility_Li/Pt (High Tension Power Line)
RS_Reserves_Pg (Natural Reserves)
Data Layers
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10K National Coverage
•In Esri ArcGIS Geodatabase Format. •Tile Based Dataset (Not Seamless).
•Metadata for each Tile. •Converts into DXF or Shapes on request.
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Lineage - Metadata
SHEET NO: 2107
DATA
SOURCE:
Aerial Photograph/Satellite Image Color Aerial Photograph
Year of Photography/Satellite Image 2010 & 2011
Scale of Photography/Resolution 1:20000
Method of Data Collection
Stereo Compilation
Year of Compilation 2013
Field Checked 2013
Database Completed 2014
Sheet Covered by(Coordinate)
Xmin 168000
Y Min 390000
X Max 176000
Y Max 395000
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GFCODE
Unique in the Database (5 Alphabetic Characters)
•1-4 Chars : represent the feature
•5th Char: represent the feature type • P -Point
• L - Line
• A - Area
• V – Virtual
Eg. MNRDL – Main Roads
MRBRL – Main Road on Bridge
MNRDL
MRBRL
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Data Validation : OpenStreet Map with ArcGIS
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Compare with Google Earth Satellite Images
GIS Activities in the Survey Department 13
School Locations
Approx. 9500
Hospital Locations
Approx. 1100
Toponomy
Approx. 32,573
Sri Lanka – Other Data
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Sri Lanka – Administrative Divisions
Province : 9 (Largest Admin Unit)
District : 25 (Sub Division of Province)
DS Division : 331 (Divisional Secretariat Division
Main Public Administrative Unit)
GN Division : 14,021 (Grama Niladari Division.
Sub Divisions of DS Division
Smallest Administrative Unit)
Local Authority : 335 (Local Revenue Authorities
Pradesiya Saba, Urban Council and
Municipal Council)
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GN- Division Data– Smallest Admin. Units
14,021 Units cover the whole Island
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GN Division Data with Geo Coding
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GN Division with Population
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Parcel Base Land Information System.
Parcel DB completed - 15 D.S.Div.
Field Survey
Commenced
In 75-D.S.Div.
Planning to Expedite LIS through
e-Land Hub
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Parcel Base Land Information System.
Moratuwa DS Division
48,500 Land Parcels.
12-Digits National ID for each Land Parcel
Parcel Information
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Population Density
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Population Density
Illustration of nested Administrative Hierarchy of Sri Lanaka
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24 24
Detail Map
Common platform for decision making
Statistical
data
Spatial data
Integrated
data
Common
Geo
codes
Maps
Tables
Reports
Evidence
Base
Decisions
For economical,
Social and
environmental
development
Graphs
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5911,696(19)
5781,708(18)
5891,560(22)
5791,188(28)
5833,813
(1)
5881,655(21)
577827(33)
576735(35)
573790(34)
5861,309(23)
5802,085(11)
5741,135(30)
5901,686(20)
5841,294(25) 575
1,308(24)
5811,260(26)
5821,048(31)
5681,210(27)
5712,109
(9)
5602,341
(6)559
2,165(8)
5871,148(29)
5931,998(14)
5642,543
(5)
5921,881(15)
5653,430
(2)
5692,011(12)
5672,106(10)
5613,173
(3)
5662,217
(7)
5901,686(20)
5721,754(17)
5851,005(32)
5633,106
(4)
5702,009(13)
5621,839(16)
Pujapitiya DS Division
Pathadumbara DS Division
Harispattuwa DS Division
Matale District
80°39'0"E80°37'30"E80°36'0"E
7°2
5'3
0"N
7°2
4'0
"N7°2
2'3
0"N
7°2
1'0
"N
Location Details
Map: P4.21.09.1 Population by GN Division - Akurana DS Division, Kandy District - 2012
0 0.4 0.80.2 Kilometers
Legend
Boundaries
District
DS Division
GN Division
Population
735 - 1,005
1,006 - 1,309
1,310 - 1,881
1,882 - 2,217
2,218 - 2,543
2,544 - 3,813 Data Source: Preliminary Results of Census of Population and Housing - 2012.
:
Notes: * Age Group (%) indicate the percentage distribution of population by age (less than 15 years, 15 to 59 years & 60 years and over ) within the GN Division.
** Dependency Ratio = (persons Aged below 15 years and above 59 years / Persons Aged 15 to 59 years) * 100
Notes:
*1, 1A, 1B, ...45, 45A,45B ... 325, 325A, ... :
Denotes the GN Division Number (Refer Annex for relevant GN Division Name)
** 9,999 Indicates the Population of the GN Division
*** (1), (2), ... (35), (36) ... (126), (127) ... : Indicates the GN Division rank according to the Population size
(least number for highest Population)
Prepared by: Cartography Division, Department of Census & Statistics.
Nagoda DS Division
Niyagama DS Division
Matara District
Kalutara District
Ratnapura District
225B
226
225
228
229E
230B
230D
229G
229B
226C
224A
230C
228F
224
229C
226B
227B
227
230
225A
226A
229F
230E
228A
230A
229
225C
228G
228D
227C
229D
227A
229A
228C
228B
228E
80°24'0"E80°21'0"E80°18'0"E
6°2
4'0
"N6°2
1'0
"N6°1
8'0
"N6°1
5'0
"N
Location Details
Map: P4.31.18.3 Population by Age Group (less than 15 years, 15 to 59 years, 60 years and over) and Dependency Ratio by GN Division - ThawalamaDS Division, Galle District, 2012
0 1 20.5 Kilometers
Legend
Boundaries
District
DS Division
GN Division
Age Group (%) *
0.33
Less than 15 years
15 - 59 years
60 years and over
Dependency Ratio **
41.9 - 52.9
53.0 - 59.3
59.4 - 63.0
63.1 - 65.0
65.1 - 68.5
68.6 - 72.8
Data Source: Preliminary Results of Census of Population and Housing - 2012.Prepared by: Cartography Division, Department of Census & Statistics.
:
Notes: * Age Group (%) indicate the percentage distribution of population by age (less than 15 years, 15 to 59 years & 60 years and over ) within the GN Division.
** Dependency Ratio = (persons Aged below 15 years and above 59 years / Persons Aged 15 to 59 years) * 100
*** 1, 1A, 1B, ...45, 45A,45B ... 325, 325A, ... : Denotes the GN Division Number (Refer Annex for relevant GN Division Name)
Neluwa DS Division
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Ampara
Anuradhapura
Moneragala
Kurunegala
Badulla
Puttalam
Ratnapura
Galle
Matale
Kandy
Mullaitivu
Polonnaruwa
Mannar
Batticaloa
Kegalle
Trincomalee
Hambantota
Vavuniya
Kalutara
Matara
Gampaha
Jaffna
Nuwara Eliya
Kilinochchi
Colombo
Mannar
99,051
82°0'0"E81°0'0"E80°0'0"E
10
°0'0
"N9°0
'0"N
8°0
'0"N
7°0
'0"N
6°0
'0"N
:Legend
District Boundary
Population Density
( Persons per Sq.Km.)
31 - 60
61 - 200
201 - 600
601 - 1,000
1,001 - 2,000
2,001 - 4,000
I n d i a n O c e a n
Pop u lat i on De n si ty b y D istr i c t , 2012
0 20 40 6010 Kilometers
Ampara
Anuradhapura
Moneragala
Kurunegala
Badulla
Puttalam
Ratnapura
Galle
Matale
Kandy
Mullaitivu
Polonnaruwa
Mannar
Batticaloa
Kegalle
Trincomalee
Hambantota
Vavuniya
Kalutara
Matara
Gampaha
Jaffna
Nuwara Eliya
Kilinochchi
Colombo
Mannar
( 3 )
( 11 )
( 17 )
( 4 )
( 13 )
( 6 )
( 2 )
( 5 )
( 14 )
( 18 )
( 10 )
( 7 )( 1 )
( 23 )
( 16 )
( 24 )
( 21 )
( 22 )
( 15 )
( 19 )
( 8 )
( 12 )
( 20 )
( 9 )
( 25 )
82°0'0"E81°0'0"E80°0'0"E
10
°0'0
"N9°0
'0"N
8°0
'0"N
7°0
'0"N
6°0
'0"N
:Legend
District Boundary
Sex (%) *
590,000
Male
Female
Sex Ratio
( Males per 100 Females )
88.1 - 90
90.1 - 92
92.1 - 94
94.1 - 96
96.1 - 98
98.1 - 100
100.1 - 102
I n d i a n O c e a n
( 1 ), ( 2 ),...........( 25 ),Indicates the DistrictRank of Sex-Ratio(least number for
highest Percentage)
Pop u lat i on by S ex an d Sex R at i o b y D ist r i c t , 2012
* Note:Sex (%): Indicates thepercentage distributionof population by sex,
within the District
0 20 40 6010 Kilometers
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Naula
Matale
Ambana
Lenawa
Ukuwela
Rattota
Nalanda
Kibissa
Senagama
Dambulla
Guruwela Oggomuwa
Dunuwila
Talagoda
Ridiella
Elkaduwa
Weragama
Dankanda
Pussella
Mahawela
Madawala
Opalgala
Madipola
LenadoraGalewela
Gonawela
Sigiriya
Pallegama
Wilgomuwa
Kaluganga
Elagomuwa
Pubbiliya
Ankumbura
Aluvihare Kaikawala
Dombawala
Yatawatta
Paldeniya
Gammaduwa
Millawana
Wahakotte
Waralanda
Pelwehera
InamalawaEtorahena
Pallegama
Viharagama
Uduwelwala
Dambagolla
Gurubabila
Akuramboda
Hewanewela
Nikawehera
Bulanewewa
Pubbarawela
Radunnewela
Yodagannawa
Medapihilla
Kandanuwara
Palapatwela
Kohalanwela
Kongahawela
Walakumbura
Beliyakanda
Panampitiya
Nayakombura
Yakkuragala
Talakolawela
Dammanatenna
Diganpathaha
Karagahatenna Himbiliyakada
Kathurupitiya
Pilihudugolla
Tittawelgolla
Gedigaswelana
Makulugaswewa
Kapuruwediwela
Talakiriyagama
Weliwaranagolla
Ratmalagaha Ela
Dandubendiruppa
Siyambalagaswewa
Mirisgoni Oya Junction
Dambulla PS
Naula PS
Laggala-Pallegama PS
Wilgamuwa PS
Galewela PS
Rattota PS
Ukuwela PS
Pallepola PS
Matale PS
Yatawatta PS
Dambulla MC
Ambanganga Korale PS
Matale MC
Matale PS
Naula
Dambulla
Wilgamuwa
Galewela
Laggala-Pallegama
Rattota
Matale
Ukuwela
Pallepola
Yatawatta
Ambanganga Korale
Polonnaruwa District
Kandy District
Kurunegala District
Anuradhapura District
Badulla District
Ampara District
81°0'0"E80°50'0"E80°40'0"E80°30'0"E
8°0
'0"N
7°5
0'0
"N7
°40
'0"N
7°3
0'0
"N
Location Details
Map: P3.22.1.4 Distribution of Population Density - Matale District, 2012
0 5 102.5 Kilometers
Legend
" District Secretariat
" Divisional Secretariat
") Town
Major Road
Railway
Boundaries
District
DS Division
Local AuthorityData Source: Preliminary Results of
Census of Population and Housing - 2012.
Prepared by: Cartography Division,
Department of Census and Statistics.
:
Population
(Persons per Sq.Km.)
0 - 132
133 - 369
370 - 737
738 - 1,475
1,476 - 2,607
2,608 - 4,240
4,241 - 6,715
Distribution of Population Density- District Level
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Current Status - 1:1,000 Topo Database
Construction (CO) CO_Building_Pt
CO_Building_Pg
Hydro (HY) HY_Hydro_Pt
HY_Hydro_Li
HY_Hydro_Pg
Landuse (LU) LU_Landuse_Pt
LU_Landuse_Pg
LU_Reserves_Pg
Terrain (TE) TE_Terrain_Pt
TE_Terrain_Li
Transport (TR) TR_Transport_Pt
TR_Transport_Li
TR_Transport_Segment
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1K Data – Colombo Metropolitan Area.
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Future endeavors.
•Implement a NSDI (National Spatial Data Infrastructure) •Introduce fast map updating system. •Transform Tile base Database to a Seamless one. •Providing Foundation Data in Open Standards.
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