61. Alfred Leick Home Page Moved To. www.gnss.umaine.edu. or. www.spatial.maine.edu/~leick. http://www.spatial.maine.edu/~leick/gpshome.htm

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62. Geodetic Datum Overview Geodetic datums define the size and shape of the earth and the origin and orientation of the coordinate systems used to map the earth. http://www.colorado.edu/geography/gcraft/notes/datum/datum.html

Geodetic Datum Overview Peter H. Dana k.foote@colorado.edu This page is available in a framed version . For convenience, a Full Table of Contents is provided. Revised: 2003.2.11. Associated Overviews Introduction to Geodetic Datums Geodetic datums define the size and shape of the earth and the origin and orientation of the coordinate systems used to map the earth. Hundreds of different datums have been used to frame position descriptions since the first estimates of the earth's size were made by Aristotle. Datums have evolved from those describing a spherical earth to ellipsoidal models derived from years of satellite measurements. Modern geodetic datums range from flat-earth models used for plane surveying to complex models used for international applications which completely describe the size, shape, orientation, gravity field, and angular velocity of the earth. While cartography, surveying, navigation, and astronomy all make use of geodetic datums, the science of geodesy is the central discipline for the topic. Referencing geodetic coordinates to the wrong datum can result in position errors of hundreds of meters. Different nations and agencies use different datums as the basis for coordinate systems used to identify positions in geographic information systems, precise positioning systems, and navigation systems. The diversity of datums in use today and the technological advancements that have made possible global positioning measurements with sub-meter accuracies requires careful datum selection and careful conversion between coordinates in different datums.

63. The University Of Maine - GPS-GAP The GPSGAP addresses the mathematical, physical and geodetic foundation of geospatial positioning with GPS (Global Positioning System). http://www.gnss.umaine.edu/

Calendar Campus Map Search: About UMaine Student Resources Prospective Students Alumni ... GeoSpider Quicklinks A-Z Directory Athletics Bear Necessities Bookstore Calendar Campus Security Fogler Library Center for the Arts MaineStreet Phone Directory President's Office Web DSIS GPS, G eodesy and A pplication P rogram GPS - GAP Asynchronous Internet Education GNSS= f (GPS, GLONASS, GALILEO, COMPASS) The GPS-GAP addresses the mathematical, physical and geodetic foundation of geospatial positioning with GPS (Global Positioning System). The material is presented with sufficient depth as needed for understanding all geospatial positioning accuracy levels, ranging from 100 meter to millimeter, in either real-time or post process. The basis for understanding GPS and its applications is mathematical modeling, signal processing, estimation, and geodetic theory. GPS-GAP, therefore, focuses on this foundation. Since the focus is on mathematics and physics, the courses fulfill undergraduate and graduate course requirements in engineering and science. Students will feel satisfaction from experiencing how mathematics, statistics, physics, electronics, and global data communication come together to generate such an amazing global system. Practitioners and application developers will gain useful knowledge from these courses for exploring satellite positioning within the GNSS (Global Navigation Satellite System), consisting of GPS, the Russian GLONASS and the forthcoming European GALILEO and Chinese COMPASS systems.

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