On the assessment of the temporal evolution of global terrestrial reference frames: the veda approach

Title:

On the assessment of the temporal evolution of global terrestrial reference frames: the veda approach

Creator:

Ampatzidis , Dimitrios

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:c82a7219-ad59-477e-b1ce-0b0cd7ad8575
uuid:c82a7219-ad59-477e-b1ce-0b0cd7ad8575
doi:10.13168/AGG.2019.0007

Subject:

terrestrial reference frame, Helmert transformation, reference frame assessment, geometric effect, ITRF2008, and DTRF2008

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

In this paper, we describe an alternative methodology for the assessment of global Terrestrial Reference Frames (TRFs), called the Velocity Decomposition Analysis (VEDA). Although it is related to the well-known Helmert transformation, a new conceptual manner is presented and discussed. All the necessary mathematical formulas for the adjustment and the quality assessment are provided, as well as a discussion of the similarities and differences to the existing approaches. The core of the VEDA concept lays on the separation of the velocities in two parts: the transformation related one and the optimal velocities, respectively. Using the suggested strategy, we test the global TRFs, the ITRF2008 and the DTRF2008. Their comparison in terms of Helmert transformation parameters reveals discrepancies reaching 0.83 mm/yr for the orientation rates, 0.97 mm/yr for the translation rates and 0.32 mm/yr for the scale rate. The comparison between the new approach and the classical Helmert transformation shows a consistency at the level of 0.66 mm/yr in a mean sense. In addition, we find a relative bias between the two frames reaching 0.44 mm/yr. The new approach also allows quantifying the geometric effect which corresponds to the impact of the systematic inconsistencies and the effect of the set of stations global distribution.

Language:

English

Rights:

http://creativecommons.org/publicdomain/mark/1.0/
policy:public

Coverage:

85-97

Source:

Acta geodynamica et geomaterialia : | 2019 Volume:16 | Number:1 (193)

Harvested from:

CDK

Metadata only:

false