Webinar instructions will be emailed before the date of the webinar.

Please log into the webinar 15 – 30 minutes before start time.

Monday, May 10, 2021
8:30 am – 4:00 pm CDT (including a 60-min. break)


Presented by Dr. Thomas H. Meyer

Observation Modes
Absolute positioning
• Autonomous
• Precise point positioning (PPP)
• Differenti al GPS (DGPS)
Relative positioning
• Phase differencing
• CORS • Atop a tripod
• Static post-processing and OPUS
• Real-time kinematic
• Real-time network

Independence of Observations: How Long Should We Wait?
What is independence? What is correlation? Bias?
Occupation duration
Examples of occupation duration with various epoch rates
Discussion of the constellation
• Orbital planes, slots, overview of SVs, 12-hr orbital period
Heighting example

Error Budget
Range-pole centering error
• Dilutions of precision
• Ionosphere → multi-frequency receivers
• Troposphere
• Signal-to-noise ratio
• Positioning discussion: trilateration
• Control → orbits
• Predicted (broadcast) vs. modeled (precise)
• Comparison of ephemeris accuracies
• Overview of how ranging works
• C/A code, P code
• Phase observable

To the Future
Reference frames, geodesy
• NAD 83 non-geocentricity, WGS 84, ITRF
• NATRF 2022
• Time-dependent positioning, Stable North American Ref. Frame (SNARF)
GPS modernization
• L1C, L2C, L5
• New navigation message


 Webinar Instructions

Each webinar session earns continuing education credit and can be registered for individually. All attendees must log-on through their own email – attendees may not watch together if they wish to earn continuing education credit. HalfMoon Education Inc. must be able to prove attendance if either the attendee or HalfMoon Education Inc. is audited.

Certificates of completion will be provided for each webinar attended and will be sent via email in PDF form about five business days after the conclusion of the series.

Webinars are presented via GoToWebinar, an easy-to-use application that can be run on most systems and tablets. Instructions and login information will be provided in an email sent close to the date of the webinar. It is highly recommended that you download, install and test the application before the webinar begins by clicking on the link in the email.

GoToWebinar App requirements:
Windows 7 – 10 or Mac OSX Mavericks (10.9) – macOS Catalina (10.15)

Web Browser:
The two most recent version of the following browsers:
Google Chrome, Mozilla Firefox, Apple Safari, Microsoft Edge
Internet Explorer v11 (or later) with Flash enabled

Internet connection:
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For more information, visit the Support section at


Land Surveyors:
6.0 PDHs
(FL, MO, and TN Pending Approval, NJ, RI – No Credit Offered)

Professional/Civil Engineers:
6.0 PDHs


Continuing Education Credit Information
These webinars are open to the public. They offer continuing education credits to land surveyors in most states. Course approvals have been applied for in Florida, Missouri, and Tennessee, which are pending. Continuing education credits are not being sought in New Jersey or Rhode Island. HalfMoon Education is deemed an approved continuing education provider in New York land surveyors.

Continuing education credit is offered to professional and civil engineers licensed in all states. HalfMoon Education is an approved continuing education sponsor for engineers in Florida (Provider No. 0004647), Indiana (License No. CE21700059), Maryland, New Jersey (Approval No. 24GP00000700), North Carolina (S-0130), and North Dakota.

HalfMoon Education is deemed an approved continuing education provider for engineers and land surveyors licensed in New York (Regulations of the Commissioner §68.14(i)(2) and §69-1.5(i)(2)). The Landscape Architecture Continuing Education System has approved HalfMoon Education Inc. as a continuing education sponsor.

HalfMoon Education is an approved continuing education sponsor for land surveyors licensed in Indiana (License No. CE21700059), Maryland, North Carolina (S-0130), and North Dakota.

Tracking the Railroads is approved by the American Planner Association AICP for
CM | 4.0 for Certified Planners (Course No. 9212632).


Dr. Thomas H. Meyer

University of Connecticut
Dr. Meyer is a professor in the Department of Natural Resources and the Environment at UConn’s College of Agriculture, Health and Natural Resources (CAHNR). He is a member of the American Society of Civil Engineers and the American Society for Photogrammetry and Remote Sensing, and he is a fellow and current president (2019) and past president (2016) of the American Association for Geodetic Surveying. Dr. Meyer is a past president (2006-2007) of the Geomatics Society of New England (previously known as the New England Section ACSM) and a member of the editorial boards of the Journal of Surveying Engineering and Surveying and Land Information Science. Dr. Meyer earned his Ph.D. degree from Texas A&M University (College Station, 1998) where he was a research associate in the Mapping Sciences Laboratory. He was named a UConn Teaching Fellow (2015), and he has taught geomatics courses at the graduate and undergraduate levels in geodesy, geographic information science, digital terrain modeling, spatial statistics and global navigation satellite system surveying. Dr. Meyer has authored an undergraduate-level geodesy textbook and numerous peer-reviewed papers about surveying and mapping and he teaches professional education seminars for surveyors throughout New England and the United States.

Webinar Price: $289.00