Applications of Geodesy Surveying and mapping Defence Geophysical explorations Space explorations Communication, Navigation, etc. Geodesy is the common link connecting Surveying • Photogrammetry • Cartography • Geodynamics • Geophysics • Physics • Why should a Surveyor study Geodesy Geodetic control surveys Understanding geodetic datums and coordinate systems, e.g. NAD-83, WGS-84 • Difference between geodetic and astronomic coordinates • Different between geodetic and astronomic azimuth • Azimuth change due to convergence of meridians • Lengths of lines on the datum surface • Reduction of measured lines to datum surface • Geodetic levelling Different datums (geoids), e.g. NGVD29, NAVD88 • Orthometric height and dynamic height • Effect of gravity on levelling • GNSS Surveys Satellite datum(s) • GNSS derived coordinates and baselines • GNSS derived orthometric heights (elevations • State Plane Coordinates Why is it needed? • Definition and implementation • Relevant computations • A knowledge of geodetic principles are needed in any survey that Covers a very large area or a distance • Has to meet very high accuracy standards • Uses specialized techniques such as GNSS •
Applications of Geodesy Surveying and mapping Defence Geophysical explorations Space explorations Communication, Navigation, etc. Geodesy is the common link connecting • Surveying • Photogrammetry • Cartography • Geodynamics • Geophysics • Physics Why should a Surveyor study Geodesy Geodetic control surveys • Understanding geodetic datums and coordinate systems, e.g. NAD-83, WGS-84 • Difference between geodetic and astronomic coordinates • Different between geodetic and astronomic azimuth • Azimuth change due to convergence of meridians • Lengths of lines on the datum surface • Reduction of measured lines to datum surface Geodetic levelling • Different datums (geoids), e.g. NGVD29, NAVD88 • Orthometric height and dynamic height • Effect of gravity on levelling GNSS Surveys • Satellite datum(s) • GNSS derived coordinates and baselines • GNSS derived orthometric heights (elevations State Plane Coordinates • Why is it needed? • Definition and implementation • Relevant computations A knowledge of geodetic principles are needed in any survey that • Covers a very large area or a distance • Has to meet very high accuracy standards • Uses specialized techniques such as GNSS