2025 Recorded Webinars
2-3:30 pm
ET
GNSS Best Practices
Presenter: Dan Martin, Northeast Regional Advisor, Geodetic Services Division, ranch, NGS;
The use of GNSS technology has become common within the surveying profession. This is especially true when it comes to the use of real-time techniques (Real-Time Kinematic) and Real-Time Networks (RTN). These techniques offer methods that significantly increase productivity, with little degradation of accuracy. But a tool by itself does not produce accuracy or confidence. The procedures used, and attention to detail by the user, are what helps to ensure you achieve the results you are aiming for. In this workshop, we will discuss the GNSS tools and techniques that are available, their adequacy for common survey tasks, and take an in-depth look at “best practices” that have been developed by practitioners that are designed to catch blunders, eliminate common systematic errors, and increase confidence in survey results. We will also look at the newly released NGS Standards and Specifications, which include the use of Real-Time techniques, and provide research showing why certain specifications or techniques are required.
This presentation will reference: NOAA Technical Memorandum NOS NGS 92.
>> Learn more about this webinar.
90
Min
4.7
MB
2-3 pm
ET
The Southern Louisiana Astrogeodetic Survey: Assessing the Performance of GEOID2022 along the Mississippi River
Presenters: Ryan Hardy, Ph.D., Geodesist, Geosciences Research Division, NGS
In 2024, NGS collaborated with Louisiana State University, Oregon State University, and Swisstopo to deploy state-of-the-art astronomical cameras to measure geoid slopes along the Mississippi River between Baton Rouge and New Orleans. The goals of the survey were to compare the performance of these instruments and to validate GEOID2022 in this region. This survey aims to replicate the success of NGS’s past Geoid Slope Validation Surveys with fewer resources and in less time. Southern Louisiana was chosen because of the challenges both sparse data and subsiding land present to geoid modeling. This region has a critical need for accurate orthometric heights in a low-lying, vulnerable, and densely populated shipping corridor.
>> Learn more about this webinar.
60
Min
5.1
MB
2-3 pm
ET
Updates to Products and Models within the North American-Pacific Geopotential Datum of 2022
Presenters: Kevin Ahlgren, Ph.D., Geodesist, Spatial Reference System Division, Gravity and Heights Branch, NGS; Ryan Hardy, Ph.D., Geodesist, Geosciences Research Division, NGS
A geoid model is a mathematical description of the irregular surface that approximates Earth's mean sea level and takes into account Earth's gravitational variations. GEOID2022 offers improved accuracy and data for navigation, positioning, and the myriad applications of geodesy, including autonomous navigation, precision agriculture, civil surveying, early warning systems, and improved floodplain mapping. The other models in the NAPGD2022 portfolio are derivatives of GEOID2022 and are used in many specialized applications like inertial navigation systems, geodetic leveling corrections, and corrections to other surveying observations.
>> Learn more about this webinar.
60
Min
33
MB
- Email us
-
Subscribe for webinar notifications
