Intro to GIS Exam 3

  1. True or false: Trend surface analysis is an exact interpolation method.

    A. True
    B. False
    B. False
  2. A(n) __________ model relates a dependent variable to a number of independent variables.

    B. Regression
  3. True or false: Thiessen polygons are the same as Voronoi polygons.

    A. True
    B. False
    A. True
  4. Delaunay triangulation is _______ used in preparing Thiessen polygons.

    B. often
  5. There two types of density estimation methods: simple and ________.

    C. Kernel
  6. ______________ is based on a probability function.

    D. Kernel density estimation
  7. True or false: inverse distance weighted is an exact interpolation method

    A. True
    B. False
    A. True
  8. This interpolation method is based on the assumption that the estimated value of a point is influenced more by nearby known points than by those further away.

    D. Inverse distance weighted
  9. This interpolation method fits the control points with a minimum-curvature surface.

    D. Thin-plate splines
  10. Methods to correct the steep gradients that thin-plate splines produce in data-poor areas are know as ___________.

    B. radial basis functions
  11. True or false: thin-plate splines and their variations are not recommended for smooth, continuous surfaces such as elevation and water table.

    A. True
    B. False
    B. False
  12. This interpolation method involves a spatially-correlated component representing the variation of the regionalized variable; a drift or structure representing a trend; and a random error term.

    C. Kriging
  13. A semivariogram plots, for each point, the semivariance (γ(h)) against the distance (_) between that point and every other one.

    A. h
  14. Which of the following methods of binning by direction--radial sectors or grid cells--does the Geostatistical Analyst extension to ArcGIS use?

    D. Grid cells
  15. In the equation for average semivariance, which letter denotes the attribute value?

    B. z
  16. _________ is the term for the existence of directional differences in spatial dependence.

    A. Anisotropy
  17. Which part of a fitted semivariogram represents measurement error, microscale variation, or both?

    C. Nugget
  18. Which element is the distance at which the semivariance starts to level off?

    D. Range
  19. What is the level at which the semivariance levels off?

    A. Sill
  20. This kriging method assumes the absence of a drift and uses the fitted semivariogram directly for interpolation.

    A. Ordinary kriging
  21. Which of the following comparison methods removes one known point at a time from the data set, computes a value at that location using the remaining points, and then compares the predicted value to the observed one?

    C. Cross-validation
  22. _________________, the most common type of geocoding, plots street addresses as point features on a map.

    B. A or B
Card Set
Intro to GIS Exam 3
Terms and concepts for GEOG 5500, chapters 15 and later.