Survey

OPUS Unavailable this Weekend for Station Upgrade

August 20, 2015By

The Continuously Operating Reference Station network’s Silver Spring facility will be go offline starting at about 2 p.m. Eastern time Friday, but is expected to be back online by noon Sunday. “Our alternate facility will have full data holdings,” the National Geodetic Survey says on its CORS website. The shutdown is for a building-wide upgrade. The Online Positioning User Service... read more

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Trimble Launches VRS Now Service in Georgia

August 17, 2015By

Trimble has launched Trimble VRS Now correction service in Georgia. The commercial subscription service provides surveyors, civil engineers, and geospatial professionals in the region with instant access to real-time kinematic (RTK) GNSS corrections without the need for a base station. Using both the GPS and GLONASS constellations, the Trimble service delivers centimeter-level RTK corrections customized for each GNSS receiver’s location... read more

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Satel Joins with Antenna Maker Welotec at INTERGEO

August 12, 2015By
satel-products-INTERGEO_2015

Finnish radio data communication specialist Satel will present innovative new products for mission-critical radio data networks at INTERGEO, being held in Stuttgart, Germany, Sept. 15-17. In Germany, radio data communication solutions from Satel are distributed by the full-range and systems provider Welotec. At the trade fair in Stuttgart, the partners will present their products at adjacent stands. Both Satel as a radio... read more

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Fugro Expands Survey Services and Satellite Imagery Capabilities

August 12, 2015By

Fugro has extended its integrated survey services to help improve efficiency in coastal management and enable more informed decision-making. A new agreement with global specialist EOMAP enables the creation of integrated bathymetric survey products that comprise elements from Satellite Derived Bathymetry (SDB), Airborne LiDAR Bathymetry (ALB) and traditional acoustic survey technologies. The integrated data and product solutions will provide clients... read more

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Collecting Points in Difficult Environments with the JAVAD TRIUMPH-LS

August 12, 2015By
A TRIUMPH-LS collecting a point under tree canopy.

By Matt Johnson Fundamental in the determination of GNSS solutions is resolving the correct number of full cycles of the carrier signal (so-called fixing ambiguities) in order to resolve the ambiguity differences between the base and the rover. Distances measured from GNSS receivers contain errors caused by inaccuracies in the satellite and receiver clocks, the satellite orbits, and by the... read more

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Trimble Launches VRS Now Service in New Mexico

August 11, 2015By

Trimble has launched its Trimble VRS Now correction service in New Mexico. The commercial subscription service provides surveyors, civil engineers and geospatial professionals in the region with instant access to real-time kinematic (RTK) GNSS corrections without the need for a base station. Using both the GPS and GLONASS constellations, the Trimble service delivers centimeter-level RTK corrections customized for each GNSS receiver’s... read more

Establishing Orthometric Heights Using GNSS — Part 2

August 5, 2015By
Figure 2. NAD 83 (2011) Network Design for Stations EA0873 and EA0875. [Note: GNSS Vectors for GNSS projects GPS 1588 and GPS 2057 were provided by NGS].

GNSS-derived ellipsoid heights are the basis for GNSS-derived orthometric heights, so it makes sense to make these ellipsoid heights as close to error free as possible. This article will discuss guidelines for detecting, reducing andr eliminating error sources in ellipsoid heights. It will focus on guidelines for establishing accurate ellipsoid heights in a local geodetic network. (Part 2 of a series) read more

JAVAD GrAnt Antenna Designed for High Performance

August 3, 2015By
GrAnt

The GrAnt by JAVAD GNSS is a versatile high-performance antenna. With J-shield — the JAVAD GNSS filter that protects GPS L1, Galileo L1 and GLONASS L1 bands — the GrAnt antenna can track GPS, GLONASS, Galileo, BeiDou, WAAS, EGNOS, MSAS, GAGAN and QZSS signals. J-shield brings in all the useful signals intact and rejects out-of-band signals with the slope of about 12 dB/MHz. Similarly, the... read more

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