Survey and Mapping

FIG /IAG Technical Seminar: Reference Frame in Practice
January 16, 2012

FIG /IAG Technical Seminar: Reference Frame in Practice

Monte Mario, the highest hill in Rome

A special seminar for geodesists will take place in Rome, Italy on May 4 and 5, just before the 35th FIG general assembly and working week.

The conference venue is the Cavalieri hotel on Monte Mario near the Vatican.

It is organized by the International Association of Geodesy (IAG), the surveyors’ international association (FIG) and the UN’s International Committee on GNSS (ICG).

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By Inside GNSS
Network RTK and Reference Station Configuration
November 16, 2011

Network RTK and Reference Station Configuration

Q: What effect does network size have on NRTK positioning?

A: Network real-time kinematic (NRTK) positioning is nowadays a very common practice, not only in academia but also in the professional world. In the last 10 years, several networks of continuous operating reference stations (CORSs) were created to support users. These networks offer real-time services for NRTK positioning, providing centimeter-level positioning accuracy with an average distance of 25–35 kilometers between the reference stations.

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By Inside GNSS
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Mark Greaves
September 13, 2011

Mark Greaves

Mark Greaves is one of two geodetic analysts at Ordnance Survey.

He holds an M.Sc. in engineering surveying and geodesy and is a member of the Royal Institute of Chartered Surveyors.

Greaves specializes in geodetic GNSS computations and analysis. He has worked at Ordnance Survey for almost 25 years during which time he has been responsible for several national GNSS network adjustments, including two internationally ratified realizations of the ETRS89 coordinate reference system in Great Britain.

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By Inside GNSS
Paul Cruddace

Paul Cruddace

Paul Cruddace is the geodesy and positioning manager at Ordnance Survey, Great Britain’s national mapping agency.

He is responsible for the development and implementation of the overall strategy including the national GNSS infrastructure.

Cruddace is a chartered surveyor with a background in the use of precise GPS positioning to determine earthquake hazards.

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By Inside GNSS
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Trimble Launches New OEM GNSS Modules, Enclosure
August 26, 2011

Trimble Launches New OEM GNSS Modules, Enclosure

Trimble BD920

Trimble has introduced two new GNSS OEM modules, the BD910 and BD920, featuring centimeter-level, real-time kinematic (RTK) positioning capabilities optimized for high-precision and control applications.

The BD910 and BD920 modules are designed to allow OEMs and system integrators to easily add centimeter-level positioning to specialized or custom hardware solutions.

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By Inside GNSS
What is a virtual reference station and how does it work?
July 11, 2011

What is a virtual reference station and how does it work?

Q: What is a virtual reference station and how does it work?

A: To reach centimeter-level — or even better — accuracy of positioning typically requires use of precise dual-frequency carrier phase observations. Furthermore, these observations are usually processed using a differential GNSS (DGNSS) algorithm, such as real time kinematic (RTK) or post-processing (PP). Regardless of the specific differential algorithm, however, implicit in the process is an assumption that the quality of the reference station data is consistent with the desired level of positioning accuracy.

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By Inside GNSS
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