Either the Dell ATG or Panasonic Toughbook computer.Trimble Lithium-ion batteries (2) installed in the 5700,.Trimble 5700 receiver (the one on which you collected data),.Our experiments indicate that the actual error is less than these estimated accuracies more than 95 percent of the time, RSGPS statistics.” Required hardware: However, this also results in the NAD 83 coordinates being somewhat less accurate.įor rapid static: Absent any warning messages, the best estimates of coordinate accuracies are the standard deviations reported by single baseline analysis. To serve our users, the NAD 83 coordinates of the National CORS are updated less frequently than ITRF coordinates. This is due to the procedures used to derive the CORS coordinates.
On the average, one should obtain larger peak-to-peak errors in the NAD 83 coordinates, when compared to the ITRF coordinates. The advantage of the peak-to-peak error measure is that the error range also reflects any error in the CORS reference coordinates. Any misidentification of the antenna type or height, local multipath or adverse atmospheric conditions will NOT be averaged away by the 3 “independent” CORS solutions. Please note that peak-to-peak accuracy estimates depend upon freedom from systematic error. The peak-to-peak error is the difference between the maximum and the minimum value of a coordinate obtained from the 3 baseline solutions. Instead, the peak-to-peak error, or error range, is provided for each coordinate component (XYZ, Φλh and H). Estimating the accuracy for a specific data file is difficult, however, as formal error propagation is notoriously optimistic for GPS reductions.
“Under ideal conditions, OPUS can easily resolve most positions to within centimeter accuracy. NGS makes the following statement concerning accuracy of OPUS positions: You may submit an observation data file as many times as you wish. The latest available Rapid Ephemeris can be found here. The email response from NGS will indicate which ephemeris was used for that particular solution. After about 24 hours, improved Rapid Ephemeris will automatically be used providing the potential for much better accuracy. This can result in somewhat less accurate positions – on the order of several decimeters. If the service is used within about 24 hours of occupation, lower accuracy broadcast ephemeris will be used. Note that OPUS uses the best available ephemeris data available. The GP helps mitigate multi-path errors and is generally used at base stations with long observation times. The only difference between the two antennas is the present of a ground plane (GP) on the Zephyr Geodetic.
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This document will describe how to download data collected with a Trimble 5700 receiver collected with either a Trimble Zephyr or Zephyr Geodetic antenna. To use properly, please familiarize yourself with the information provided under the About tab at the OPUS site.” OPUS is highly automated and requires minimal user input. Your computed NSRS position is sent privately via email, and, if you choose, can also be shared publicly via the NGS database. OPUS processes your GPS data files with the same models and tools which help manage the Nation’s Continuously Operating Reference Station (CORS) network, resulting in coordinates which are both highly accurate and highly consistent with other users. “This Online Positioning User Service (OPUS) provides you with simplified access to high-accuracy National Spatial Reference System (NSRS) coordinates: all you need is a clear view of the sky and a survey-grade (preferably dual frequency) Global Positioning System (GPS) receiver. According to the National Geodetic Survey: The Online Positioning User Service ( ) is provided without fees by the National Geodetic Survey.
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