True or false: Trend surface analysis is an exact interpolation method.
A(n) __________ model relates a dependent variable to a number of independent variables.
True or false: Thiessen polygons are the same as Voronoi polygons.
Delaunay triangulation is _______ used in preparing Thiessen polygons.
There two types of density estimation methods: simple and ________.
______________ is based on a probability function.
D. Kernel density estimation
True or false: inverse distance weighted is an exact interpolation method
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
This interpolation method fits the control points with a minimum-curvature surface.
D. Thin-plate splines
Methods to correct the steep gradients that thin-plate splines produce in data-poor areas are know as ___________.
B. radial basis functions
True or false: thin-plate splines and their variations are not recommended for smooth, continuous surfaces such as elevation and water table.
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 semivariogram plots, for each point, the semivariance (γ(h)) against the distance (_) between that point and every other one.
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
In the equation for average semivariance, which letter denotes the attribute value?
_________ is the term for the existence of directional differences in spatial dependence.
Which part of a fitted semivariogram represents measurement error, microscale variation, or both?
Which element is the distance at which the semivariance starts to level off?
What is the level at which the semivariance levels off?
This kriging method assumes the absence of a drift and uses the fitted semivariogram directly for interpolation.
A. Ordinary kriging
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?
_________________, the most common type of geocoding, plots street addresses as point features on a map.
B. A or B
Intro to GIS Exam 3
Terms and concepts for GEOG 5500, chapters 15 and later.