Accuracy of gps units
[DOC File]GPS data collection in CSA 2
https://info.5y1.org/accuracy-of-gps-units_1_385798.html
Landlines or legal boundaries must be GPSed with survey-grade GPS units. For other corporate layers, if recreational grade GPS data is all that’s available, it may be incorporated into the corporate data, but must be designated as “>5 meter accuracy” in the metadata for the features you GPSed (see below).
[DOC File]A PRACTICAL GUIDE TO GPS - UTM
https://info.5y1.org/accuracy-of-gps-units_1_74a84c.html
DGPS is a system whereby the GPS unit receives corrections by way of radio signals from a GPS unit at a known location. While most hand held GPS units are said to be "DGPS Ready," that is for hook-up, this is most commonly used by boats. Units now are able to use WAAS to obtain even greater accuracy.
[DOC File]Field Data Collection with Global Positioning Systems
https://info.5y1.org/accuracy-of-gps-units_1_20da98.html
GPS Positional Accuracy. Positional accuracy for autonomous, code-phase, resource grade or C/A-code receivers range from +/- 100 meters to less than +/- 1 meter. Accuracy for carrier-phase units (commonly referred to as geodetic receivers) can be measured in millimeters. Accuracy is dependent on a number of factors.
[DOCX File]Introduction
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Consumer devices (such as cell phones or handheld GPS units) generally only use the L1 GPS signal, whereas mapping and higher-grade devices (such as a survey instrument) can receive increasing types of signal including L1, L2, and C/P.
[DOC File]UTILIZING RTK–GPS IN MEASURING HEAVE
https://info.5y1.org/accuracy-of-gps-units_1_0df42f.html
DGPS uses two or more GPS receiver-antenna units to position an unknown point or set of points relative to a known point or set of points. DGPS improves upon the positioning accuracy otherwise attainable in absolute point positioning methods, which use a single GPS receiver-antenna unit.
[DOC File]GPS Position Measurements
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What level of GPS recording is shown by the receiver (2D GPS, 3D GPS, 3D Differential, etc.)? What is the estimated accuracy of the current readings as displayed by the receiver on the satellite screen (some older units will not report this value)? Do you notice changes in the accuracy as the GPS recording level changes? Recording Data
[DOC File]Field Data Collection with Global Positioning Systems
https://info.5y1.org/accuracy-of-gps-units_1_fa93f9.html
GPS Positional Accuracy. Positional accuracy for autonomous, code-phase, resource grade or C/A-code receivers range from 100 meters to less than 2 meters. Accuracy for carrier-phase units (commonly referred to as geodetic receivers) can be measured in millimeters. Accuracy is dependent on a number of factors.
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