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PPP solutions are range from 0.024 m to 0.251 m for TP01 and range from 00.078 m to 1.033 m for TP02.
When the results have been examined for AUSPOS and OPUS services using relative technique, it is found that the positional accuracy for 3D positioning differences is range from 0.024 m to 0.124 m for TP01 and from 0.082 m to 1.033 m for TP02.
In addition to this, when the results have been considered for CSRS-PPP, APPS and GAPS services, which are used PPP solution, it is found that the positional accuracy for 3D positioning differences is range from 0.024 m to 0.251 m for TP01 and from 0.078 m to 0.859 m for TP02.
It can be concluded that PPP technique and web based online services provide high performance for the applications implemented in the forest environment to achieve precise point positions with 3-hours or more durations of static GPS data observations. With this aspect, PPP technique and web based online services using this technique have become significant alternatives to the user.
The author would like to thank to International GNSS Service (IGS) for providing GPS data and products, to Istanbul Water and Sewerage Administration (ISKI), to Geoscience Australia, USA National Geodetic Survey, Natural Resources Canada, University of New Brunswick and NASA’s Jet Propulsion Laboratory for providing web based online services.
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URL-1: International GNSS Service (IGS) web page,
URL-2: Australian Online GPS Processing Service (AUSPOS) web page,
URL-3: Online Positioning User Service (OPUS) web page, http://www.ngs.noaa. gov/OPUS/
URL-4: Canadian Spatial Reference System-Presice Point Positioning (CSRS-PPP) web page,
URL-5: GPS Analysis and Positioning Software (GAPS) web page, http://gaps.
URL-6: Automatic Precise Positioning Service (APPS) web page,
URL-7: magicPPP-Precise Point Positioning Solution (magicGNSS) web page,
URL-8: Trimble CenterPoint RTX Post-Processing Service web page,
URL-9: Istanbul Water and Sewerage Administration (ISKI-UKBS) CORS web page,