FIG Working Week 2011 Bridging the Gap between Cultures Marrakech, Morocco, 18‐22 May 2011 1 GNSS HEIGHTING AND ITS POTENTIAL USE IN MALAYSIA DEPARTMENT OF SURVEY AND MAPPING MALAYSIA Hasan Jamil FIG WORKING WEEK Marrakech WW2011 PRESENTATION OUTLINE Vertical datum and Levelling Background Case Studies Conclusion GNSS Heighting Introduction
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FIG Working Week 2011
Bridging the Gap between Cultures
Marrakech, Morocco, 18‐22 May 2011 1
GNSS HEIGHTING AND ITS
POTENTIAL USE IN MALAYSIA
DEPARTMENT OF SURVEY AND MAPPING
MALAYSIA
Hasan Jamil
FIG WORKING WEEKMarrakech WW2011
PRESENTATION OUTLINE
Vertical datum and Levelling Background
Case Studies
Conclusion
GNSS Heighting
Introduction
FIG Working Week 2011
Bridging the Gap between Cultures
Marrakech, Morocco, 18‐22 May 2011 2
BRIEF: Malaysia - Morocco
MAP OF MALAYSIA
FIG Working Week 2011
Bridging the Gap between Cultures
Marrakech, Morocco, 18‐22 May 2011 3
MALAYSIA
Land Area: 329,758 square km
Population: 28 million
Climate: Tropical, temperature
from 23 oC - 32 oC
Maritime Area: 603,210 square km
Location: South East Asia
BACKGROUND
Horizontal and verticalcontrol in Malaysia fallsunder Department of Surveyand Mapping
FIG Working Week 2011
Bridging the Gap between Cultures
Marrakech, Morocco, 18‐22 May 2011 4
VERTICAL DATUM AND
LEVELLING IN MALAYSIA
1908 : Earliest Vertical Datum at Port
Klang
1912 : First National Vertical Datum
(LSD)
1967 : First Order Levelling Network
(FOLN67)
1912 : First line levelled from Port Klang
to Kuala Lumpur
VERTICAL DATUM AND
LEVELLING IN MALAYSIA
1984-1993 : Peninsular Malaysia Geodetic
Vertical Datum (10-year tidalobservation)
1985-1999 : Precise Levelling Network
2000 onwards : Upgrading of Precise LevellingNetwork
FIG Working Week 2011
Bridging the Gap between Cultures
Marrakech, Morocco, 18‐22 May 2011 5
PRECISE LEVELLING NETWORK
THAILANDGETING
CHENDERING
TG.GELANG
PULAU
TIOMAN
SEDILI
JOHOR
BAHRU
TG.KELING
PORTKLANG
LUMUT
PULAU
PINANG
PULAU
LANGKAWI
KUALA
LUMPUR
SINGAPORE
KANGAR
NAKA
PADANG
BESARBUKIT
KAYU
HITAM
SIK
ALOR
SETAR
GURUN
BALING
BUTTERWORTH
KG.SUMPITA
N
GERIK
IPOH
BAGAN
SERAI
AYER
TAWAR
SITIAWAN
BEHRANG
SG.BESAR
BENTA
TRANUM
KUALA
KUBU
BENTONG
KARAK
JERANTUT
TEMERLOH
KG.AWAHGAMBANG
KUANTAN
KOTA
BHARU
BANDING
MUADZAM
KERATONG
LEBAN
CHONDON
G
SEGAMAT
AYER KEROH
MELAKA
PEDAS
LINGGI
SEREMBAN
BAHAU
SERTINGKELANG
AYER
HITAM
BATU PAHAT SKUDAI
PONTIAN
KECIL
JEMALUANG
GUA
MUSANG
TIDE GAUGE STATION
LEVELLING NETWORK
JUNCTION POINT
Extent of Precise Levelling Network in Peninsular Malaysia
Conventional Digital (bar coded)Motorised
Methods Of Survey
PRECISE LEVELLING NETWORK (contd.)
FIG Working Week 2011
Bridging the Gap between Cultures
Marrakech, Morocco, 18‐22 May 2011 6
Uses spirit levelling in determination
of orthometric height
Simple and effective but slow
PRECISE LEVELLING NETWORK (contd.)
MALAYSIA GEOID MODEL
Malaysia has established its geoid model
which is known as MyGEOID in 2004 and 2005
Peninsular Malaysia : WMGEOID04
Sarawak and Sabah : EMGEOID05
Peninsular Malaysia
Sabah
Sarawak
FIG Working Week 2011
Bridging the Gap between Cultures
Marrakech, Morocco, 18‐22 May 2011 7
The range of geoidal height value is between -16 m (northern area) to 10 m (southern area)