national mapping initiatives in sri lanka
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National Mapping Initiatives in Sri Lanka. by S.M.W.Fernando. Surveyor General Survey Department of Sri Lanka. Ancient Mapping – Sri Lanka . Represent relatively accurate coordinates of Sri Lanka although size bit exaggerated. Records of place names, natural - PowerPoint PPT PresentationTRANSCRIPT
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National Mapping Initiatives in Sri Lanka
by S.M.W.Fernando
Surveyor GeneralSurvey Department of Sri Lanka
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LOGOAncient 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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LOGOAncient Mapping – Sri Lanka Map of Claudiuis Ptolemy
First Map of Sri Lanka
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LOGO 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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LOGOTraditional Sri Lankan Cartography
Amban Ganga valley and Yoda Ela Canal17th/18th century
Ancient Irrigation
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LOGOTraditional Sri Lankan Cartography
Mural Painting of a historical temple (18th-19th Century)
Sacred Landscape
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LOGOTraditional Sri Lankan Cartography
Soragune Devale – 17th Century
Architectural Plan of a building
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LOGO 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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LOGO16th - 18th century maps of the
country
Map from the journal of Joris van Spilbergen(in 1605)
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LOGO16th - 18th century maps of the
country
Map of the Island depicting kingdom of Kandy by Robert Knox in 1681
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LOGO16th - 18th century maps of the
country
Langka or Tambraparni (Ceylon) according to Sanscrit, Pali and Sinhalese in 1859
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LOGO 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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LOGOSystematic mappingPowers 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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LOGOSystematic mappingControl 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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LOGOSystematic mappingControl Network - Horizontal
272 Primary controls (Average accuracy 1:790000)
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LOGOSystematic mappingControl Network - Vertical
- Established during 1924-1928
- Consists of 59 Fundamental Bench marks
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LOGO Systematic mappingOne-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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LOGO Systematic mappingOne-Inch to One-Mile Map
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LOGOSystematic mappingTopographic 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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LOGOSystematic mappingTopographic Map series 1:50K
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LOGOSystematic mappingTopographic 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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LOGOSystematic mappingTopographic Map series 1:10K
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LOGOSystematic mappingDigital mapping- In 1980 -1990, Satellite technology introduced to the Department - Sophisticated survey equipment
and mapping software introduced since 1990
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LOGODigital Mapping ProductsTOPO 50K Dataset
• Admin (DS Division)• Buildings• Grid• Hydro (Streams, Tanks)• Trans (Roads, Railroad)• Landuse• Places• Reserves• Terrain (Contour, Spot
Heights)• Utility (Power Line)
Complete for the entire country
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LOGODigital Mapping ProductsTOPO 10K TILED MAP
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LOGODigital Mapping ProductsDerived DTM from 1:50K Data
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LOGODigital Mapping ProductsLIDAR Data
Digital Surface Model – Projection:UTM WGS84- Zone 44Data available from
Puttalam to Arugam Bay
LiDAR Acquisition ParametersHorizontal Resolution – 1mVertical Resolution – 0.3 m
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LOGODigital Mapping ProductsLIDAR DEM
Overlayed with Hydro and Transport layers at 1:10K
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LOGODigital mappingMap updating
using ALOS – PRISM Data: 2.5m resolution
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Thanks for attention