Quiz 10: Raster Analysis

Question 1

Map algebra is a technique for ____.

Answer 1

Analyzing stacks of raster maps using mathematical or Boolean operators

Question 2

What function would you use to take a slope raster and assign low slopes a value of 1, intermediate slopes a value of 2, and high slopes a value of 3?

Answer 2

Reclassify

Question 3

Which one of the following functions uses a moving window?

Answer 3

Focal

Question 4

Computing “slope/aspect” in a raster GIS is best classified as a ____.

Answer 4

Focal operation

Question 5

if you have two raster layers, one showing suitable logging species (a cell value of 1 for suitable and 0 for not suitable) and the other showing appropriate distance away from a lake in the area (a cell value of 1 for far enough from the lake and 0 for too close to the lake), which of the following Boolean operations will you use on these two layers in order to find out the areas that have suitable logging species and are also far enough from the lake?

Answer 5

AND

Question 6

Which of the following statements regarding the IDW (inverse distance weighted) and Spline interpolation methods is correct?

Answer 6

Generally the spline method can create smoother surfaces than the IDW method

Question 7

If you are asked to evaluate several candidate sites in a hilly area for a fire lookout tower location, which of the following GIS functions will be the most appropriate choice for such a purpose?

Answer 7

viewshed analysis