Description
Developments in space-based positioning, especially the NAVSTAR Global Positioning System (GPS) have revolutionized the ability to capture high accuracy positions anywhere in the world. The impact on the design and maintenance of classical horizontal datums has been unprecedented in history of geodesy. The transition from locally defined datums to those that are more globally referenced and provide considerably higher positional integrity has been a challenge for national geodetic institutions around the world. This course will outline the various efforts by the National Geodetic Survey to adapt to these changes and provide improved realizations and products and services to support the increasing demands of diverse disciplines
Learning Objectives
- Differences between NAD 27 and NAD 83
- Rational for changing the national reference ellipsoid
- Integration of data into the National Spatial Reference System
- National resurvey of the United States with GPS
- Evolution of the network of Continuously Operating Reference Stations
- Development of the Online Positioning User Service
- Introduction to global reference frames.
