Quality of the deflection of the vertical obtained from global geopotential models in horizontal geodetic positioning

França, Rovane Marcos de; Klein, Ivandro; Veiga, Luis Augusto Koenig

doi:10.1007/s12518-022-00473-9

Cited by 1 publication

(1 citation statement)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Neglecting the deflection of the vertical leads to systematic errors, when terrestrial observations obtained from, e.g., total stations are transformed into a global geodetic reference frame. For that reason, the consideration of the vertical deflection in local tie networks is recommended (Leinen et al 2007;de Franca et al 2022). Hereinafter, this approach is refereed to as DOV approach.…”

Section: Introductionmentioning

confidence: 99%

Operator-software impact in local tie networks

et al. 2023

View full text Add to dashboard Cite

The operator-software impact describes the differences between results introduced by different operators using identical software packages but applying different analysis strategies to the same data. This contribution studies the operator-software impact in the framework of local tie determination, and compares two different analysis approaches. Both approaches are used in present local tie determinations and mainly differ in the consideration of the vertical deflection within the network adjustment. However, no comparison study has yet been made so far. Selecting a suitable analysis approach is interpreted as a model selection problem, which is addressed by information criteria within this investigation. A suitable model is indicated by a sufficient goodness of fit and an adequate number of model parameters. Moreover, the stiffness of the networks is evaluated by means of principal component analysis. Based on the date of a measurement campaign performed at the Geodetic Observatory Wettzell in 2021, the impact of the analysis approach on local ties is investigated. For that purpose, an innovated procedure is introduced to obtain reference points of space geodetic techniques defining the local ties. Within the procedure, the reference points are defined independently of the used reference frame, and are based on geometrical conditions. Thus, the results depend only on the estimates of the performed network adjustment and, hence, the applied network analysis approach. The comparison of the horizontal coordinates of the determined reference points shows a high agreement. The differences are less than 0.2 mm. However, the vertical components differ by more than 1 mm, and exceed the coverage of the estimated standard deviations. The main reasons for these large discrepancies are a network tilting and a network bending, which is confirmed by a residual analysis.

show abstract

Section: Introductionmentioning

confidence: 99%