Validation of the number of tie vectors in post-processing using the method of frequency in a centric cube

Kudas, Dawid; Wnęk, Agnieszka

doi:10.1515/geo-2020-0057

Cited by 3 publications

(2 citation statements)

References 31 publications

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“…The stochastic model for the integrated network is complemented with information on a priori mean errors (m (∆x) ; m (∆y) ; m (∆z) ) of components of the GNSS vector (∆x jk ; ∆y jk ; ∆z jk ), which can be obtained in post-processing [26].…”

Section: Stochastic Adjustment Modelmentioning

confidence: 99%

Adjustment of an Integrated Geodetic Network Composed of GNSS Vectors and Classical Terrestrial Linear Pseudo-Observations

Gargula

2021

Applied Sciences

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The paper proposes a new method for adjusting classical terrestrial observations (total station) together with satellite (GNSS-Global Navigation Satellite Systems) vectors. All the observations are adjusted in a single common three-dimensional system of reference. The proposed method does not require the observations to be projected onto an ellipsoid or converted between reference systems. The adjustment process follows the transformation of a classical geodetic network (distances and horizontal and vertical angles) into a spatial linear (distance) network. This step facilitates easy integration with GNSS vectors when results are numerically processed. The paper offers detailed formulas for calculating pseudo-observations (spatial distances) from input terrestrial observations (horizontal and vertical angles, horizontal distances, height of instrument and height of target). The next stage was to set observation equations and transform them into a linear form (functional adjustment model of geodetic observations). A method was provided as well for determining the mean errors of the pseudo-observations, necessary to assess the accuracy of the values following the adjustment (point coordinates). The proposed algorithm was verified in practice whereby an integrated network made up of a GNSS vector network and a classical linear-angular network was adjusted.

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Section: Stochastic Adjustment Modelmentioning

confidence: 99%

Adjustment of an Integrated Geodetic Network Composed of GNSS Vectors and Classical Terrestrial Linear Pseudo-Observations

Gargula

2021

Applied Sciences

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“…The ETRS89 is transferred to Poland and implemented in the form of the PL-ETRF2000 frame by the Polish Active Geodetic Network (ASG-EUPOS), which is characterized by a spatial configuration compliant with standards of European Position Determination System (EUPOS) [1,2]. ASG-EUPOS system services enable geodetic measurements using relative positioning methods using the Global Navigation Satellite System (GNSS) signals and determination of coordinates with centimeter accuracy in real time or in post-processing [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Identification of land system transformations in the Rzeszów city square

2023

Archives of Civil Engineering

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The paper presents the results of a comparative study of the land system of the city square and adjacent buildings for Rzeszów in Poland. The study made use of a cadastral map at a scale of 1:2880 and a modern land and building record map. For the purpose of adjusting reference systems, the cadastral map recorded in the form of a digital raster image, in accordance with applicable provisions of polish law (Journal of Laws No. 263 §49), was subjected to a two-stage calibration. The first stage consisted in carrying out initial calibration with the employment of first-degree affine transformation. In the second stage, final calibration was performed using mathematical transformation that considered the distortions detected in the previous stage. The results showed shifts, consolidations, and divisions of land parcels with regard to the present state, and changes to property structure. The proposed method may prove useful for further research on historical urban system morphology, and on restoration and renewal of the urban tissue.

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Optimisation of an Automatic Online Post-Processing Service for Static Observations as Realised in the Polish ASG-EUPOS System

2022

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The paper presents an assessment of the accuracy and precision of point positioning using a currently available online service for automatic post-processing (APPS) of GNSS observations made by the Polish Active Geodetic Network—European Position Determination System (ASG-EUPOS). The ASG-EUPOS network is part of the national EUPOS project and was selected for the study because of its substantial spatial reach in Europe. A modification to the current APPS algorithm is proposed to limit the number of baseline vectors used in positioning and change the method for adjusting post-processing results. Currently, the APPS of the ASG-EUPOS determines point coordinates based on the method for adjusting direct and equally accurate observations with the least-squares method (equally accurate method, EAM). The modification proposes to determine the coordinates based on post-processing results adjustment using the unequally accurate observations method (unequally accurate method, UAM). Our analysis diagnoses the uncertainty of the ASG-EUPOS’s APPS, and the modification optimises the adjustment. The proposed modification facilitates a much lower standard deviation of positioning in relation to reference positions. It is demonstrated that, if modified, the ASG-EUPOS service can provide automatic post-processing for 1 h GPS observations with a 1 s interval at 0.03 m accuracy for 99% of cases.

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Validation of the number of tie vectors in post-processing using the method of frequency in a centric cube

Cited by 3 publications

References 31 publications

Adjustment of an Integrated Geodetic Network Composed of GNSS Vectors and Classical Terrestrial Linear Pseudo-Observations

Adjustment of an Integrated Geodetic Network Composed of GNSS Vectors and Classical Terrestrial Linear Pseudo-Observations

Identification of land system transformations in the Rzeszów city square

Optimisation of an Automatic Online Post-Processing Service for Static Observations as Realised in the Polish ASG-EUPOS System

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