Abstract
In July 2000, Hanoi-72 reference system was replaced by the Vietnam reference system, namely as VN-2000 as an official geodetic background system in Vietnam. Ministry of Natural Resources and Environment of Vietnam has reported the transformation parameters between VN-2000 and WGS84. Nevertheless, there is a need to estimate a new transformation parameter set between VN-2000 and WGS84 because WGS84 has been updated. In addition, there is now a lack of an accurate published set of parameters for transformation from VN-2000 to not only the International Terrestrial Reference System ITRS but also PZ-90. In this study, coordinate transformation parameters between ITRS and VN-2000 are estimated through the use of a least square approach and the common points with known coordinates in both systems. These set of parameters was then deployed to determine the link between VN-2000 and WGS84 as well as PZ-90. The results denoted that the derived transformation parameters, on the basis of the results at the checkpoints, could generated station positions with the accuracy at several cm level for transformation from VN-2000 to the new realizations of ITRS, WGS84 and PZ90 and reversely. These achievements reveals that the set of parameters is great significance for many applications related to positioning in Vietnam.
Highlights
In the era of globalization and modernization, Vietnam, a developing country, would adopts many scientific and technological achievements
The transformation parameters between the other International Terrestrial Reference Frame (ITRF) realizations denoted by ITRFXY and VN-2000 is determined according to the following formula: ITRFxy→VN2000=(ITRFxy→ITRF2008)+(ITRF2008→VN2000)
The negative scale factor values indicate that the geometric shapes of the ITRF and VN-2000 are reduced when the scale factor is applied in conjunction with the other parameters for transforming coordinates from ITRF to VN-2000
Summary
In the era of globalization and modernization, Vietnam, a developing country, would adopts many scientific and technological achievements. In which the use of geospatial data generated by countries with the most advanced technology is extremely useful. These data sources are not in VN-2000 but in different coordinate systems. The concept of a static datum, like VN-2000, has served Vietnam and many other countries well because it is easier to implement and maintain than dynamic coordinate systems. There is a need to estimate a new transformation parameter set between two systems because WGS84 has been updated. The shortage of official links between VN-2000 with three above-mentioned international reference systems will make VN-2000-based data not be able to integrate with international ones. Transformation parameters between the VN-2000 and the ITRS are used to determine the links between VN-2000 and WGS84 and PZ-90
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