Category Archives: Surveying

What’s Inside Your GNSS Rover? Part 2

The second installment of a three-part look at the inner workings of high-precision surveying rovers. In Part One of this series (xyHt magazine, September 2023 issue) we focused on the antenna, amplification, and housing elements of rovers. This installment continues with channels, boards, and gates.  Channels There is a lot of misunderstanding about what receiver...

Why Opus Projects? Part 2 of 2

OPUS Projects Streamlines Submitting GPS Surveys to National Geodetic Survey By Philippe Hensel with Dan Gillins, Dan Martin and Julie Prusky  “Texas Special Reference Center (TSRC) of Conrad Blucher Institute is leading the efforts toward modernization of the horizontal and vertical datums in the State of Texas, particularly in the subsidence zone in southeast Texas....

A New Perspective with Drone Photogrammetry

Geotechnical engineers say drones offer a safer, faster method of data collection to identify potential geohazards and assist with mitigation along vulnerable transportation corridors.   Mountain roadways are prime locations for geohazards, such as rockfalls, landslides, and debris flows. These events result in road closures, injuries, and property damage, sometimes triggered by thaw/freeze cycles or...

Virtual Reality and City Planning

Engaging citizens to participate actively in urban development projects can often be difficult. But rendering designs in 3D city models and transforming them into immersive virtual reality spaces might just do the trick. When it comes to reshaping cities and constructing new structures, modern architects consider public participation an essential part of creating sustainable and...

Testifying as an Expert 

Legal Boundaries A boundary dispute case, or any case involving surveying, surveyors, landowners, and property rights (“property disputes”) is a different breed of civil litigation from most others. There are many unique aspects of this type of litigation not common to other cases.   The biggest difference is that the parties are paying for the litigation...

Why Opus Projects? Part 1 of 2

Part 1 of 2The new version of the NGS suite of Online Position User Service tools simplifies many tasks By Philippe HenselWith Dan Gillins, Dan Martin and Julie Prusky  NOAA’s National Geodetic Survey (NGS) continues to improve its suite of Online Position User Service (OPUS) tools. In addition to single-point processing, OPUS offers a web-based...