GIS 205 Chapter 2

  1. What is another term for spheroid?



    C. Ellipsoid
  2. What is a datum?
    A mathematical model of the Earth, which serves as the reference or base for calculating the geographic coordinates of a location.
  3. What 3 things make up a datum?
    An origin, a spheroid, and the separation of the spheroid and the Earth at the origin.
  4. What do conformal projections preserve?



    A. Local angles and shapes
  5. What do equivalent projections preserve?



    B. Areas
  6. What do equidistant projections preserve?



    C. Consistency of scale along certain lines
  7. What do azimuthal projections preserve?



    C. Certain accurate directions
  8. What is the standard line?
    The line of tangency between the projection surface and the reference globe; standard parallel if it follows a parallel, standard meridian if it follows a meridian.
  9. What is the principal scale?
    The scale of the reference globe.
  10. What is the scale factor?
    The normalized local scale, defined as the ratio of the local scale to the principal scale.
  11. The projection file contains information on what 3 things?
    The geographic coordinate system, the map projection parameters, and the linear unit.
  12. What 3 purposes does a projection file serve?
    Identifying a data set's coordinate system, input for projecting or reprojecting the data set, and be exported to other data sets that are based on the same coordinate system.
Author
dtarasov
ID
127612
Card Set
GIS 205 Chapter 2
Description
Terms and concepts from chapter 2 of the Chang text.
Updated