Accuracy Assessment for Online GNSS Post Processing Services: Case Study in Central Part of Ethiopia
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Date
2024-02
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Addis Ababa University
Abstract
Currently, numerous organizations have designed online GNSS processing services for the processing of GNSS data. These services are user-friendly, have unlimited usage, and are largely free. They are also easy to use, as they do not require a license or extensive knowledge of GNSS processing software, unlike commercial software that necessitates expertise in GNSS and experience in processing. Furthermore, the cost of software licensing for post-processing and analyzing GNSS data is eliminated with these services. The objective of this research is to conduct accuracy assessment fo various online GNSS processing services used worldwide, including OPUS-project, AUSPOS, CSRS-PPP, and Trimble Center Point RTX-PPP. For comparison purpose the identical data was processed by two commercial software; Leica geo-office and Magnet-Tools. To evaluate the accuracy of online services the scientific software (BERNESE) was used as reference. The differences in coordinates between BERNESE and these services were calculated. The accuracy and precision of each online processing service was evaluated using the Root Mean Square Error (RMSE) method. From the evaluations, it was seen that the results for each online processing services in the horizontal and vertical directions were (2.4cm and 5.3cm) for OPUS-project, (2.1cm and 4.8cm) for AUSPOS, (0.8cm and 4.4cm) for CSRS-PPP, (1.6cm, and 4.4cm) for Trimble/PPP, (2.4cm, and 11.4cm) for Leica geo-office and (2.9cm and 10.9cm) for Magnet-Tools. Based on the findings, the use of precise point positioning (PPP) service provide reliable solution than relative services. Over all, as this study based on the accuracy, CSRS result surpassing other services. Following CSRS Trimble-RTX and AUSPOS produce closely the same result. The result show that, the solutions provided from online services can use for many geodetic practical applications.
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Keywords
Online Services, Observation Duration, Post Processing, accuracy & precision, Root Mean Square Error, Comparative assessment.