GNSS Derived Heights
Abstract
Geospatial practitioners have several methods to produce precise and accurate horizontal data from Global Navigation Satellite Systems (GNSS). However, the vertical data produced are typically 1.5 to 2.5 times less precise and require more attention to produce survey grade results. When our new national vertical (geopotential) datum is rolled out around 2022, the primary access to the datum “truth” will be by remote means to the national CORS network, as opposed to using NAVD 88 marks in the ground published in the NGS integrated database. Many users will also access the new datum from other active stations aligned to the National Spatial Reference System (NSRS) - especially real time networks. This lunchtime talk will take a brief look at the static and near real time methods that may enable us to obtain survey grade orthometric heights from GNSS, both now and into the near future.
Presenter
William Henning, Prof.LS., is a Registered Professional Land Surveyor with over 46 years of active experience in all phases of the land surveying profession. He has been actively involved with education/outreach to the geospatial community for 20 years, presenting over 130 talks and workshops on surveying and GNSS technology. Mr. Henning has authored articles for professional journals and trade magazines on GNSS positioning as well as authoring an extensive guideline document on single base real-time GNSS positioning and spearheading a real-time network guideline document, while working at NOAA’s National Geodetic Survey (NGS). He has trained various federal and local personnel in using GNSS equipment and correct positioning techniques. He has been the project lead for new height modernization geodetic networks in county-wide projects in the U.S., where he planned, helped construct, processed, adjusted and managed new geodetic control systems using NGS guidelines. He has over 20 years experience working with various GNSS manufacturers’ real- time positioning systems.
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David Alvarez
“THE FURTHER BACKWARDS YOU LOOK, THE FURTHER FORWARD YOU CAN SEE"
Winston Churchill
