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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
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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.
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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.
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Foundation Data
Surv
ey
Dep
artm
ent
Co-
oper
ate
Inst
itutio
ns
Taxing
Utilities
Buildings
Valuation
Planning
GIS Applications
Cadastral Mapping
NSDI -Sri Lanka
Geodetic Network
Topographic Mapping
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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
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Digital Topographic Database
GIS - TopoDB
1K
50K10K
Dataset 1 :Data available for Entire CountryDataset 2: New series from ALOS Satellite Images Sheet No. 1- 39
Data available for 86 % of the Country
Colombo Metropolitan Area Only
250KData 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 GeodatabaseFormat.
•Tile Based Dataset (Not Seamless).
•Metadata for each Tile.
•Converts into DXF or Shapes on request.
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Lineage - MetadataSHEET 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 CollectionStereo Compilation
Year of Compilation 2013
Field Checked 2013
Database Completed 2014
Sheet Covered by(Coordinate) Xmin 168000Y Min 390000X Max 176000Y Max 395000
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GFCODEUnique 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 RoadsMRBRL – 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
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GIS Activities in the Survey Department13
School LocationsApprox. 9500 Hospital LocationsApprox. 1100 ToponomyApprox. 32,573
Sri Lanka – Other Data
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Sri Lanka – Administrative DivisionsProvince : 9(Largest Admin Unit)
District : 25(Sub Division of Province)
DS Division : 331(Divisional Secretariat DivisionMain Public Administrative Unit)
GN Division : 14,021(Grama Niladari Division.Sub Divisions of DS DivisionSmallest Administrative Unit)
Local Authority : 335(Local Revenue AuthoritiesPradesiya 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 CommencedIn 75-D.S.Div.
Planning to Expedite LIS throughe-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
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Illustration of nested Administrative Hierarchy of Sri Lanaka
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2323
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2424
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Detail Map
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Common platform for decision making
Statistical data
Spatial data
Integrated data
Common Geocodes
Maps
Tables
Reports
EvidenceBaseDecisionsFor 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°25
'30"
N7°
24'0
"N7°
22'3
0"N
7°21
'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
BoundariesDistrict
DS Division
GN Division
Population735 - 1,0051,006 - 1,309
1,310 - 1,8811,882 - 2,217
2,218 - 2,543
2,544 - 3,813 Data Source: Preliminary Results of Census of Population and Housing - 2012.
:
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°24
'0"N
6°21
'0"N
6°18
'0"N
6°15
'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
LegendBoundaries
District
DS Division
GN Division
Age Group (%) *0.33
Less than 15 years15 - 59 years60 years and over
Dependency Ratio **41.9 - 52.953.0 - 59.359.4 - 63.063.1 - 65.065.1 - 68.568.6 - 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
1
82°0'0"E81°0'0"E80°0'0"E
10°0
'0"N
9°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
Populat ion Densi ty by Distr 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"N
9°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 forhighest Percentage)
Populat ion by Sex and Sex Rat io by Dist 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
PanampitiyaNayakombura
Yakkuragala
Talakolawela
Dammanatenna
Diganpathaha
Karagahatenna Himbiliyakada
Kathurupitiya
Pilihudugolla
Tittawelgolla
Gedigaswelana
Makulugaswewa
Kapuruwediwela
Talakiriyagama
Weliwaranagolla
Ratmalagaha ElaDandubendiruppa
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 MCMatale 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°50
'0"N
7°40
'0"N
7°30
'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
BoundariesDistrict
DS Division
Local Authority Data 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_PtCO_Building_Pg
Hydro (HY) HY_Hydro_PtHY_Hydro_LiHY_Hydro_Pg
Landuse (LU) LU_Landuse_PtLU_Landuse_PgLU_Reserves_Pg
Terrain (TE) TE_Terrain_PtTE_Terrain_Li
Transport (TR) TR_Transport_PtTR_Transport_LiTR_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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