Please use this identifier to cite or link to this item: http://cmuir.cmu.ac.th/jspui/handle/6653943832/76395
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dc.contributor.authorPuttipol Dumrongchaien_US
dc.contributor.authorChawis Srimaneeen_US
dc.contributor.authorNuttanon Duangdeeen_US
dc.contributor.authorJittrakorn Bairaksaen_US
dc.date.accessioned2022-10-16T07:09:30Z-
dc.date.available2022-10-16T07:09:30Z-
dc.date.issued2021-10-01en_US
dc.identifier.issn23117680en_US
dc.identifier.issn10170839en_US
dc.identifier.other2-s2.0-85125127445en_US
dc.identifier.other10.3319/TAO.2021.08.23.01en_US
dc.identifier.urihttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85125127445&origin=inwarden_US
dc.identifier.urihttp://cmuir.cmu.ac.th/jspui/handle/6653943832/76395-
dc.description.abstractThe Royal Thai Survey Department and Chiangmai University developed the Thailand geoid model 2017 (TGM2017) with a 1' × 1' grid to support the transformation between Global Navigation satellite System (GNSS) ellipsoid heights and Kolak-1915 vertical datum orthometric heights. TGM2007 was based on Thailand gravimetric geoid model 2017 (THAIG17) and 299 GNSS ellipsoidal heights co-located with Kolak-1915 heights. All terrestrial gravity data used for geoid computation came from the new national gravity network, consisting of 87 absolute and 9929 relative gravity stations at 10 - 25 km intervals, mostly along with existing roads. From 2016 to 2017, airborne gravity surveys were conducted at a 4000m-flight altitude and 10 km along-track spacing to acquire the gravity data over mountainous and inaccessible areas, including coastal and marine areas, at an estimated accuracy of 3.0 mGal. Long-wavelength geoid structure was controlled by the GOCE-EGM2008 combined model (GECO) and the Technical University of Denmark's global marine gravity model 2013 (DTU13). All gravity data were combined and downward, using least-squares collocation with the residual terrain model reductions from a digital terrain elevation data level 2 (DTED2). THA17G was determined by multi-band spherical Fast Fourier Transform and converted to TGM2017 with the 38.2cm root-mean-square (rms) fit of 299 GNSS/leveling co-points and a mean offset of 37.0 cm. This value represents the separation between Kolak-1915 and a global mean sea level. The evaluation of TGM2017 at 100 GNSS/leveling checkpoints shows the rms of 4.9 cm, consequently leading to reliable orthometric heights at a 10-cm accuracy level or better.en_US
dc.subjectEarth and Planetary Sciencesen_US
dc.titleThe determination of Thailand Geoid Model 2017 (TGM2017) from airborne and terrestrial gravimetryen_US
dc.typeJournalen_US
article.title.sourcetitleTerrestrial, Atmospheric and Oceanic Sciencesen_US
article.volume32en_US
article.stream.affiliationsChiang Mai Universityen_US
article.stream.affiliationsRoyal Thai Survey Departmenten_US
Appears in Collections:CMUL: Journal Articles

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