Tag Archives: gnss

The R1 is a small Bluetooth peripheral GNSS receiver that is purpose-designed for mapping-grade uses.

Mapping Peripheral

A review of Trimble’s R1, a GNSS Bluetooth peripheral for mobile devices, with multiple options for correction sources. The idea of a GNSS “puck” has broad appeal: a peripheral GNSS receiver to precision-enable mobile devices such as smart phones, tablets, and a variety of purpose-built field-data-collection devices. There is a lot of functional territory between...

GNSS Next: A Control Center for Real-time GNSS Data

Editor’s Note: GNSS is a global amenity that all segments of society now rely on. While low-precision uses of GNSS can work with the default broadcast products alone, directly from the satellites, all high-precision GNSS uses rely to varying degrees on external “value added” data products. These products, such as enhanced clock and orbit data, are...

Where Theory Meets Practice: Geodetic Observations: Part 1

Since the inception of GPS in the 1980s, surveyors have been presented with GPS baseline reduction results that list both geodetic azimuths and distances for the baseline vectors. In Part I of this article, I present the difference between the normal to the geoid and ellipsoid, which is known as deflection of the vertical, and...

Where Theory Meets Practice: Geodetic Observations – Part 2

Part 1 of this article (March 2014) presents the differences between azimuths that surveyors observe with a total station and the geodetic azimuths listed in GNSS adjustment reports. However, the effect on angles caused by the deflection of the vertical at the observing station is typically small. Thus, the difference between the observed astronomic angle and...

Survey Web Tools

How to use them for land survey planning and reconnaissance.  When I first used GNSS, it was my usual practice to go to the National Geodetic Survey (NGS) website to gather the data sheets for control monuments in the vicinity of my project area. I would plot these in a program called TopoScout, a topographic...