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  Nowadays, Global Positioning System (GPS) has been used effectively in several  engineering applications for the survey purposes by multiple disciplines. Web-based  online services developed by several organizations; which are user friendly,  unlimited and most of them are free; have become a significant alternative against  the high-cost scientific and commercial software on achievement of post processing  and analyzing the GPS data. When centimeter (cm) or decimeter (dm) level  accuracies are desired, that can be obtained easily regarding different quality  engineering applications through these services. In this paper, a test study was  conducted at ISKI-CORS network; Istanbul-Turkey in order to figure out the  accuracy analysis of the most used web based online services around the world  (namely OPUS, AUSPOS, SCOUT, CSRS-PPP, GAPS, APPS, magicGNSS). These  services use relative and precise point positioning (PPP) solution approaches. In this  test study, the coordinates of eight stations were estimated by using of both online  services and Bernese 5.0 scientific GPS processing software from 24-hour GPS data  set and then the coordinate differences  between the online services and Bernese  processing software were computed. From the evaluations, it was seen that the  results for each individual differences were less than 10 mm regarding relative  online service, and less than 20 mm regarding precise point positioning service. The accuracy analysis was gathered from these coordinate differences and standard  deviations of the obtained coordinates from different techniques and then online  services were compared to each other. The results show that the position accuracies  obtained by associated online services provide high accurate solutions that may be  used in many engineering applications and geodetic analysis.

Analysis of web-based online services for GPS relative and precise point positioning techniques