Course Description:
Geopspatial practitioners are familiar with using active stations to remotely provide control data to produce high precision horizontal positions. However, when our new national vertical (geopotential) datum is rolled out around 2022, we will also be able to remotely access active stations for high precision orthometric heights. This session will explain the new national geometric and geopotential datums in comparison to NAD 83 and NAVD 88 and underline the transition from passive monuments in the ground to active antennas in the air as the basis for our vertical “truth”. Additionally, the different heights, such as ellipsoidal, orthometric, dynamic and geoid, found on a typical NGS data sheet , will be explained with the role (or non-role) that gravity plays for each.
Learning Objectives:
To become familiar with these terms, how they interrelate and their expected precisions & accuracies:
- Ellipsoid heights
- Orthometric heights
- Geoid heights
- Dynamic heights
- Geopotential numbers
- National vertical datums
Lots of good information.