Development of a Time-Dependent 3-Parameter Helmert Datum Transformation Model: A Case Study for Malaysia

Gill, James B.; Shariff, N. S.; Omar, Kamaludin Mohd; Din, Ami Hassan Md; Amin, Zulkarnaini Mat

doi:10.5194/isprs-archives-xlii-4-w1-181-2016

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…Station AMAN is believed to be displaced and subsided since the difference between these two epochs in the vertical component is larger as compared to other stations with a magnitude of 26.7 cm. This deduction can be confirmed as the previous study conducted by Gill et al, (2016) has mentioned that AMAN has a different direction and velocity than the others as it experiences severe subsidence as well as study conducted by Aris (2018), the long-term coordinate time series plotted shows that the station has subsided. Nevertheless, station LAWS need to be plotted its long-term coordinate time series to confirm subsidence has occurred here.…”

Section: Resultssupporting

confidence: 83%

Assessment of Geocentric Datum of Malaysia 2000 (Gdm2000)

Jaffar¹,

Musa²,

Aris³

2019

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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Abstract. Several major earthquakes that happened nearby Malaysia for the past decades resulted in a tectonic drift of the Sunda plate. Geocentric Datum of Malaysia 2000 (GDM2000) is affected and has shifted. This paper aims to assess the consistency of GDM2000 by computing datum shift caused by tectonic movement and reference frame effect. Daily solution coordinate of Malaysia Real-Time Kinematic Network (MyRTKnet) stations in the latest reference frame i.e ITRF2014 generated and a coordinate discrepancy between the current reference frame and publish coordinate provided by Jabatan Ukur dan Pemetaan Malaysia (JUPEM) are computed. The result shows that the datum has shifted with an average of 34.6 cm and moved with an average orientation of 111.1° toward the southeast direction. Therefore, this study will contribute to giving an overview of the current status of GDM2000.

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Section: Resultssupporting

confidence: 83%

Assessment of Geocentric Datum of Malaysia 2000 (Gdm2000)

Jaffar¹,

Musa²,

Aris³

2019

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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“…These displacements, among others, led to the initiative to revise the GDM2000 coordinates. Furthermore, the coordinates are also in due revision, owing to the constant plate tectonic motion [4]. This revision took place in 2009, also known as the GDM2000 (2009) coordinates.…”

Section: Introductionmentioning

confidence: 99%

ASSESSMENT OF THE ACCURACY AND PRECISION OF MyRTKnet REAL-TIME SERVICES

et al. 2020

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From a network of ninety-six (96) Continuously Operating Reference Stations (CORS), the Department of Survey and Mapping Malaysia (DSMM) has developed a reliable real-time data streaming service known as the Malaysia Real-Time Kinematic GNSS Network (MyRTKnet). MyRTKnet is now operating on Leica SpiderNet system that is configured to provide coordinate to users in Geocentric Datum of Malaysia 2000 (GDM2000). As the name implied, GDM2000 is a geocentric datum for Malaysia, developed based upon the International Terrestrial Reference Frame (ITRF) 2000 or ITRF2000. One could argue that the quality of coordinates provided by MyRTKnet are less optimal as the latest realisation of ITRF at present is ITRF2014. This study aims to investigate the accuracy and precision of the resultant coordinates from MyRTKnet real-time services through a comparison with the control-quality coordinates from a network of post-processed data at some independent points for positioning purpose. Meanwhile for mapping purpose, the coordinates from Network Real-Time Kinematic (NRTK) at selected Cadastral Reference Marks (CRM) points were compared with their known values. The results show that the observed points in ITRF2000 move approximately 37 cm away from the points in ITRF2014 due to the constant movement of Sundaland Block. Meanwhile for the assessment of NRTK technique, there is no significant displacement for coordinates in ITRF2000 but ITRF2014 with the values of 4.4 and 39.8 cm at KDOJ point, respectively. The discrepancy in ITRF2014 could be due to the improper datum transformation procedure.

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“…The tectonic motion of the NUBIA plate which might result in volcanism, earthquakes and earth tremors and other deformation sources such as subsidence and soil creep [10] and un-modelled measurement biases [6] affect geodetic infrastructure (e.g. NigNet), and therefore, decrease the accuracy of reference station coordinates, thereby leading to inconsistencies in legal traceability of coordinates of NigNet coordinates over time [11].…”

Section: Introductionmentioning

confidence: 99%

Realization of time-dependent geocentric datum transformation parameters for Nigeria

et al. 2019

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Geodetic reference frames were established decades ago by classical surveying techniques; however, due to biases caused by poor observation techniques and effects of plate tectonic, the origins are poorly defined and adopted. Due to plate tectonics, the relative position of points changes with time and therefore, datum such as MINNA requires redefinition at regular intervals to be in consonant with geodetic reference frame in use. Therefore, with the Continuously Operating Reference Stations (CORS) network in Nigeria, these biases can be mitigated and a more accurate datum transformation parameter between MINNA datum and ITRF can be developed and adopted. Therefore, this study presents the results of time-dependent datum transformation parameters proposed for Nigeria using 5-years GNSS data (from 2011 to 2015) obtained from the NigNet CORS. GAMIT GNSS scientific processing software was deployed in processing, while GLOBK was used for frame definition and datum transformation parameters development. Statistical assessments show the validity of the transformation parameters. The correlation value was found to be 1, root mean square error 0.00411, normalized mean absolute error 1.267E−10 and reliability index 1.0.

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Development of a Time-Dependent 3-Parameter Helmert Datum Transformation Model: A Case Study for Malaysia

Cited by 4 publications

References 6 publications

Assessment of Geocentric Datum of Malaysia 2000 (Gdm2000)

Assessment of Geocentric Datum of Malaysia 2000 (Gdm2000)

ASSESSMENT OF THE ACCURACY AND PRECISION OF MyRTKnet REAL-TIME SERVICES

Realization of time-dependent geocentric datum transformation parameters for Nigeria

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