[gis_info] GeoBytes - FREE ASPRS\CaGIS Nov 20th - GNSS Derived Heights

David Alvarez davidalvarez76 at gmail.com
Thu Oct 29 07:59:55 PDT 2015

*GNSS Derived Heights*

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.

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.


David Alvarez


Winston Churchill
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