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True or false: Trend surface analysis is an exact interpolation method.
A. True
B. False
B. False

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)

True or false: Thiessen polygons are the same as Voronoi polygons.
A. True
B. False
A. True

Delaunay triangulation is _______ used in preparing Thiessen polygons.
A. always
B. seldom
C. often
D. never
C. often (this multiple choice question has been scrambled)

There two types of density estimation methods: simple and ________.
A. Kernel
B. Splined
C. Compound
D. Convoluted
A. Kernel (this multiple choice question has been scrambled)

______________ 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 (this multiple choice question has been scrambled)

True or false: inverse distance weighted is an exact interpolation method
A. True
B. False
A. True

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)

This interpolation method fits the control points with a minimumcurvature surface.
A. Local polynomial interpolation
B. Trend surface analysis
C. Thinplate splines
D. Inverse distance weighted
C. Thinplate splines (this multiple choice question has been scrambled)

Methods to correct the steep gradients that thinplate splines produce in datapoor areas are know as ___________.
A. semivariograms
B. trend surface analysis
C. kriging
D. radial basis functions
D. radial basis functions (this multiple choice question has been scrambled)

True or false: thinplate splines and their variations are not recommended for smooth, continuous surfaces such as elevation and water table.
A. True
B. False
B. False

This interpolation method involves a spatiallycorrelated 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)

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)

Which of the following methods of binning by directionradial sectors or grid cellsdoes the Geostatistical Analyst extension to ArcGIS use?
A. Radial sectors
B. Both
C. Grid cells
D. Neither
C. Grid cells (this multiple choice question has been scrambled)

In the equation for average semivariance, which letter denotes the attribute value?
A. z
B. h
C. γ
D. n
A. z (this multiple choice question has been scrambled)

_________ is the term for the existence of directional differences in spatial dependence.
A. Anisotropy
B. Isotropy
C. Semivariance
D. Crossvalidation
A. Anisotropy (this multiple choice question has been scrambled)

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)

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

What is the level at which the semivariance levels off?
A. Range
B. Partial sill
C. Nugget
D. Sill
D. Sill (this multiple choice question has been scrambled)

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)

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. Crossvalidation
D. Validation
C. Crossvalidation (this multiple choice question has been scrambled)

_________________, the most common type of geocoding, plots street addresses as point features on a map.
A. Parcellevel geocoding
B. A or B
C. Address matching
D. Address geocoding
B. A or B (this multiple choice question has been scrambled)

