# Intro to GIS Exam 3

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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.

A. Regression
B. Anisotropic
C. Nugget
D. Spline
A. Regression
(this multiple choice question has been scrambled)
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.

A. always
B. seldom
C. often
D. never
C. often
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5. There two types of density estimation methods: simple and ________.

A. Kernel
B. Splined
C. Compound
D. Convoluted
A. Kernel
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6. ______________ is based on a probability function.

A. Trend surface analysis
B. Kernel density estimation
C. A regression model
D. Delaunay triangulation
B. Kernel density estimation
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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.

A. Inverse distance weighted
B. Kernel density estimation
C. Local polynomial interpolation
D. Trend surface analysis
A. Inverse distance weighted
(this multiple choice question has been scrambled)
9. This interpolation method fits the control points with a minimum-curvature surface.

A. Local polynomial interpolation
B. Trend surface analysis
C. Thin-plate splines
D. Inverse distance weighted
C. Thin-plate splines
(this multiple choice question has been scrambled)
10. Methods to correct the steep gradients that thin-plate splines produce in data-poor areas are know as ___________.

A. semivariograms
B. trend surface analysis
C. kriging
D. radial basis functions
D. radial basis functions
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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.

A. Radial basis functions
B. Semivariogram
C. Trend surface analysis
D. Kriging
D. Kriging
(this multiple choice question has been scrambled)
13. A semivariogram plots, for each point, the semivariance (γ(h)) against the distance (_) between that point and every other one.

A. m
B. d
C. h
D. l
C. h
(this multiple choice question has been scrambled)
14. Which of the following methods of binning by direction--radial sectors or grid cells--does the Geostatistical Analyst extension to ArcGIS use?

B. Both
C. Grid cells
D. Neither
C. Grid cells
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15. In the equation for average semivariance, which letter denotes the attribute value?

A. z
B. h
C. γ
D. n
A. z
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16. _________ is the term for the existence of directional differences in spatial dependence.

A. Anisotropy
B. Isotropy
C. Semivariance
D. Cross-validation
A. Anisotropy
(this multiple choice question has been scrambled)
17. Which part of a fitted semivariogram represents measurement error, microscale variation, or both?

A. Sill
B. Nugget
C. Partial sill
D. Range
B. Nugget
(this multiple choice question has been scrambled)
18. Which element is the distance at which the semivariance starts to level off?

A. Range
B. Nugget
C. Sill
D. Partial sill
A. Range
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19. What is the level at which the semivariance levels off?
A. Range
B. Partial sill
C. Nugget
D. Sill
D. Sill
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20. This kriging method assumes the absence of a drift and uses the fitted semivariogram directly for interpolation.

A. Universal kriging
B. Ordinary kriging
C. Indicator kriging
D. Simple kriging
B. Ordinary kriging
(this multiple choice question has been scrambled)
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?

A. Both
B. Neither
C. Cross-validation
D. Validation
C. Cross-validation
(this multiple choice question has been scrambled)
22. _________________, the most common type of geocoding, plots street addresses as point features on a map.

A. Parcel-level geocoding
B. A or B