Deck 20: How to Perform Map Algebra in Arcgis Pro

Question 1

Which Boolean operator is used to determine the intersection of two expressions?

A) NOT
B) XOR
C) AND
D) OR

Answer 1

C

Question 2

Why can an ArcGIS model not be reopened by simply selecting Open?

A) Each model element has not been individually saved.
B) The model has no variables added.
C) The model has no parameters.
D) The model has not been run yet.

Answer 2

C

Question 3

What ArcGIS tool is used for Map Algebra?

A) Grid Math
B) Cell Sorter
C) Data Manager
D) Raster Calculator

Answer 3

D

Question 4

The shaded area of the following diagram represents the output of which operation?

A) (A AND B) XOR C
B) (A AND B) OR C
C) (A OR B) XOR C
D) (A XOR B) OR C

Question 5

The process of combining two or more grids by assigning a relative importance to each grid represents which process?

A) Decision Criteria
B) Weighted Overlay
C) Map Overlay
D) Site Suitability

Question 6

Elements that can be added to a map in ArcGIS but are not layers are:

A) Results
B) Layer Packages
C) Objects
D) Graphics

Question 7

Map Algebra is:

A) A formula for finding a local "neighborhood" of values
B) A mathematical operation that changes the resolution of a grid
C) An operation performed on 2 or more rasters, such as overlaying 2 or more grids
D) A function that calculates statistics about a subset of raster grid cells

Question 8

The sequence of actions performed using various GIS layers and tools is referred to as:

A) Workflow
B) Model Overlay
C) Suitability Analysis
D) Raster Overlay

Question 9

A suitability index:

A) Will show which areas are either suitable or not suitable
B) Will show a ranking of areas ranging from the most suitable through the least suitable
C) Will show three values-suitable (0), not suitable (1), and excluded from analysis (-1)
D) Will show 10 values strictly ranked from 1 (least suitable) through 10 (most suitable)

Question 10

Which Boolean operator is used to determine the union of two expressions?

A) NOT
B) XOR
C) AND
D) OR

Question 11

Which Boolean symbol should be placed between two layers (Raster1 and Raster2) in a Raster Calculator expression in order to properly compute the exclusive or of the two layers?

A) &
B) ^
C) ~
D) |

Question 12

The output grid created by the Raster Calculator expression: [testgrid] > 5 would have:

A) A value of 1 assigned to all cells corresponding to those cells with a value greater than 5 and a 0 assigned to all other cells.
B) A value of 0 assigned to all cells corresponding to those cells with a value greater than 5 and a 1 assigned to all other cells
C) The actual value in [testgrid] assigned to all cells corresponding to those cells with a value greater than 5 and a value of no data assigned to all other cells
D) The actual value in [testgrid] assigned to all cells corresponding to those cells with a value greater than 5 and a 0 assigned to all other cells

Question 13

In Map Algebra, multiplying a value of 1 by a value of No Data results in a cell value of:

A) No Data
B) 0
C) 1
D) -1

Question 14

The ArcGIS interface for laying out workflows is:

A) Flow Direction
B) Modelbuilder
C) Arc Plus
D) Flowmanager

Question 15

How does the "Slice" tool function in ArcGIS?

A) It divides up the values of a raster grid into different, ranked, values.
B) It splits up a raster file into multiple files.
C) It assigns a value of 0 to all "sliced" cells and a value of 1 to all "non-sliced" cells
D) It works as the equivalent of the "AND" tool when merging rasters