Introduction to Geodesy and Mapping

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  Publicado el: 2015-04-23
  Tiempo de estudio aproximado: 1.50 - 2.00 h
  Incluye sonido: yes

  Áreas temáticas

  Geospatial
  

  Descripción:

  This lesson covers the topics of geodesy, datums, map projections, and map coordinate systems. Geodesy addresses the shape of the earth: the topographic surface, geoid, and best-fit ellipsoid. Datums addresses the position and orientation or the best-fit ellipsoid and the resulting coordinates. Map projections addresses the different ways to project an ellipsoidal datum onto a flat surface. Each projection has unique properties and each has pros and cons. Coordinate systems addresses the different ways that a rectangular coordinate system can be superposed on latitude-longitude graticule.

  Objetivos:

  Terminal Objective (TO): Describe the shape of the Earth

  
  

  Enabling Objective (EO):

  
  
  
  
  • Define spheroid, ellipsoid, and geoid
  
  
  • Explain the ellipsoid of revolution and its relationship to the Geoid
  
  
  • Describe the characteristics of height systems (e.g. dynamic, orthometric and normal heights).
  
  
  • Differentiate between gravity related and ellipsoidal height.
  
  
  
  

  TO: Describe a Datum

  
  

  EO:

  
  
  
  
  • Explain how the Earth is measured and the importance of distinguishing the difference between datums.
  
  
  
  

  TO: Describe Map Projections

  
  

  EO:

  
  
  
  
  • Explain a generation globe, scale factor, and convergence.
  
  
  • Explain principal and actual scale (and differentiate between them) and how scale varies on a projection.
  
  
  • Explain the three types of projection (gnomonic, Orthographic, and stereographic).
  
  
  • Explain standard line, great circle, and rhumbline.
  
  
  • Explain secant and tangent case projections.
  
  
  • Explain conformal and non-conformal.
  
  
  • Explain the more commonly used projections and why. Provide examples.
  
  

  Palabras clave

  geodesy, geoid, ellipsoid, graticule, datums, datum shift, WGS 84, NAD 83, tidal datum, astronomic coordinates, geodetic coordinates, map projections, azimuthal, conic, cylindrical, Mercator, Lambert, stereographic, orthometric, gnomonic, scale, scale factor, great circle, rhumb line, grid coordinate systems, UTM, UPS, MGRS, PLSS