Transcript Sri Lanka - Geospatial World Forum

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National Mapping
Initiatives in Sri Lanka
by S.M.W.Fernando
Surveyor General
Survey Department of Sri Lanka
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Ancient Mapping – Sri Lanka
The first map constructing shape of
Sri Lanka produced by Greco-Egyptian
Astronomer Claudiuis Ptolemy
(AD c.90-168)
-Represent relatively accurate
coordinates of Sri Lanka although size
bit exaggerated
- Records of place names, natural
features and description of the island
was consistent
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Ancient Mapping – Sri Lanka
Map of Claudiuis Ptolemy
First Map of Sri Lanka
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Traditional Sri Lankan
Cartography
It reflects the reconstruction of
ancient engineering achievements
(construction of tanks, canals and
dams) with very little of early
knowledge of surveying
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Sri Lankan Cartography
Ancient Irrigation
Amban Ganga valley and Yoda Ela Canal
17th/18th century
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Traditional Sri Lankan Cartography
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Sacred Landscape
Mural Painting of a historical temple (18th-19th Century)
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Traditional Sri Lankan Cartography
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Architectural Plan of a building
Soragune Devale – 17th Century
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16th - 18th century maps of the
country
- Show a great variation in
depicting shape of the island
- Represent topographic and
territorial information
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16th - 18th century maps of the
country
Map from the journal of Joris van Spilbergen(in 1605)
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16th - 18th century maps of the
country
Map of the Island depicting kingdom of Kandy
by Robert Knox in 1681
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16th - 18th century maps of the
country
Langka or Tambraparni (Ceylon) according to
Sanscrit, Pali and Sinhalese in 1859
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Evolution of systematic
Mapping in Sri Lanka
Commenced in mid 18th century after
the establishment of the Survey
Department in 1800 by a proclamation
during the rule of British
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Systematic mapping
Powers of Surveyor General
The Surveyor General has been
empowered under the 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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Systematic mapping
Control Network - Horizontal
- Horizontal control Network was first established
by Mr.J.E.Jackson in 1934 with 94 principle
control points.
- Further revision in 1992 with distance
measurements by EDM equipment
- In 1999, the entire network was upgraded with
GPS observations establishing 10 Base
stations and 272 principle control points.
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Systematic mapping
Control Network - Horizontal
272 Primary controls (Average accuracy 1:790000)
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Systematic mapping
Control Network - Vertical
- Established during
1924-1928
- Consists of 59
Fundamental Bench
marks
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Systematic mapping
One-Inch to One-Mile Map series
-This is the first topographical map
series published based on ground
surveys from 1897 to1925 at
1:63,360 scale
- 72 map sheets to cover entire country
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Systematic mapping
One-Inch to One-Mile Map
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Systematic mapping
Topographic Map series 1:50K
- New metric topographical map series
published to replace One inch series
in 1977
- Compiled mostly using photogrammetric
methods (Aerial Photography on 1:40K)
and cartographic technologies based
on old One inch series
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Systematic mapping
Topographic Map series 1:50K
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Systematic mapping
Topographic Map series 1:10K
- Compiled using photogrammetric
methods and satellite images
since 1982
- 70% of the area of the country
already covered
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Systematic mapping
Topographic Map series 1:10K
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Systematic mapping
Digital mapping
- In 1980 -1990, Satellite technology
introduced to the Department
- Sophisticated survey equipment
and mapping software introduced
since 1990
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Digital Mapping Products
TOPO 50K Dataset
Complete for the entire country
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Admin (DS Division)
Buildings
Grid
Hydro (Streams, Tanks)
Trans (Roads, Railroad)
Landuse
Places
Reserves
Terrain (Contour, Spot
Heights)
• Utility (Power Line)
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Digital Mapping Products
TOPO 10K TILED MAP
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Digital Mapping Products
Derived DTM from 1:50K Data
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Digital Mapping Products
LIDAR Data
Data available from
Puttalam to Arugam Bay
Digital Surface Model – Projection:UTM
WGS84- Zone 44
LiDAR Acquisition Parameters
Horizontal Resolution – 1m
Vertical Resolution – 0.3 m
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Digital Mapping Products
LIDAR DEM
Overlayed with Hydro and Transport layers at 1:10K
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Digital mapping
Map updating
using ALOS – PRISM Data: 2.5m resolution
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