Geoid Determination In Uganda: Current Status
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Date
2017
Journal Title
Journal ISSN
Volume Title
Publisher
Advances in Engineering and Technology
Abstract
Many professionals e.g. surveyors, engineers and GIS specialists are increasingly using Global
Positioning System (GPS) or some other Global Navigation Satellite Systems (GNSS) for
positioning and navigation. One of the greatest advantages of GPS is its ability to provide
three-dimensional coordinates (latitude, longitude and height) anywhere in the world, any
time irrespective of the weather. The GPS latitude and longitude can easily be transformed
from the WGS84 reference system to a local reference (e.g. Arc 1960). However the GPSdetermined
heights, i.e. ellipsoidal heights, are geometrical heights which have no physical
meaning and therefore cannot be used in surveying and engineering projects. Their conversion
to more meaningful orthometric heights require knowledge of the geoidal undulations,
which can be determined from high resolution geoid models. Its absence in Uganda means
that the full potential of GPS cannot be fully realized. This paper gives an overview of the
need for an accurate geoid model in Uganda, the current status of the geodetic network in
Uganda and different methods of geoid determination. Pending further investigation, preliminary
findings indicate that in Uganda, the EGM2008 is the best geoid modal for GPS/leveling
projects.
Description
Keywords
Geoid model, Global Positioning System, Orthometric heights
Citation
Ssengendo, R., Sjöberg, L. E., & Gidudu, A. Geoid Determination In Uganda: Current Status.