# Intro to GIS Exam 3

 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. B. Regression 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. B. often There two types of density estimation methods: simple and ________. C. Kernel ______________ is based on a probability function. D. Kernel density estimation 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. 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. A. True B. False B. False 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 A semivariogram plots, for each point, the semivariance (γ(h)) against the distance (_) between that point and every other one. A. h 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? B. z _________ is the term for the existence of directional differences in spatial dependence. A. Anisotropy Which part of a fitted semivariogram represents measurement error, microscale variation, or both? C. Nugget Which element is the distance at which the semivariance starts to level off? D. Range What is the level at which the semivariance levels off? A. Sill 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? C. Cross-validation _________________, the most common type of geocoding, plots street addresses as point features on a map. B. A or B Authordtarasov ID288376 Card SetIntro to GIS Exam 3 DescriptionTerms and concepts for GEOG 5500, chapters 15 and later. Updated2014-11-13T21:43:45Z Show Answers