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The differences between Geoid18 values and NAD 83, NAVD 88 values
By David B. Zilkoski
GPS World columnist David Zilkoski provides an analysis of the differences between the latest published hybrid Geoid18 values provided on NGS’ Datasheet and the computed geoid height value using the published NAD 83 (2011) ellipsoid height and NAVD 88 orthometric height.
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Receiver innovators log trends and product launches
Top receiver manufacturers discuss what’s on the horizon for GNSS receivers. The companies reveal recent and upcoming innovations, how to combat spoofing and jamming, fusing GNSS with other sensors, and the impact of increasing accuracy both for professional surveyors and consumers.
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Sapcorda releases high-precision GNSS service in USA and Europe
Sapcorda Services GmbH has released its SAPA (Safe And Precise Augmentation) Premium GNSS positioning service.The SAPA service enables mass-market GNSS devices to operate with increased accuracy and reliability across Europe and the continental United States.
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E-Compass offers GNSS, inertial receiver
E-Compass Science & Technology is offering a new dynamic GNSS receiver, the E300 Pro. The interface adopts a concealed design for better protection, and USB type-C charging and transmitting is a two-in-one function.
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Maintaining the 1-dB standard
GPS World guest columnist J. David Grossman discusses how we ensure that GPS is protected from harmful interference.
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Drone mystery lights up Colorado skies
Northeastern Colorado was visited with a mystery in late December and January. Residents began seeing drones from 7 to 10 p.m. each night, moving in groups as large as 30, and flying in a grid pattern.
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