How to do site calibration with trimble survey controller

#How to do site calibration with trimble survey controller series

However, I can provide you four common scenarios, along with suggestions on what could be done.

Every project and scenario is different, so the answer will ultimately depend on the situation. There really isnвЂ™t a yes or no answer to this question. If you use a geoid model, an inclined correction plane is created based on the residuals between the geoid defined by the orthometric heights of the local control and the applied geoid model. If you do not have a geoid model, a simple vertical shift as a single point can be applied, or and inclined plane can be computed using the orthometric heights of the local control. The vertical adjustment can be done with or without a geoid model. The parameters resulting from this are a rotation, translation, and a scale of the GNSS coordinates. The horizontal adjustment is a least squares best fit to make the GNSS derived grid coordinates fit, as closely as possible, to the local control grid coordinates. Essentially, a GNSS site calibration establishes the relationship between WGS84 latitude, longitude, and ellipsoidal height, with the needed local northing, easting, and elevation.ДЄ site calibration typically consists of a horizontal and a vertical adjustment. This can be accomplished by working in a pre-defined coordinate system with known control, or by performing a GNSS site calibration. To benefit from the increased accuracy of modern RTK GNSS surveying, the WGS84 coordinates need to be translated into local grid coordinates.

A GNSS receiver measures WGS84 latitude, longitude, and ellipsoidal height coordinates to determine its location, however, surveyors typically use a local grid coordinate system.

#How to do site calibration with trimble survey controller series

Here we will address four of the more common questions to hopefully provide you some basic knowledge about what calibrations are and what they do.ДЎ.) What is a GNSS site calibration, and how does it work?ДЄ site calibration is a series of mathematical computations that transform WGS84 coordinates into local grid coordinates. Every year we get a lot of questions about GNSS site calibrations. Spring is finally here and the 2013 surveying and construction season is about to take off.