Overlay Tools

Question 1

The intersect geoprocessing operation uses what Boolean operator?

Answer 1

The Boolean AND; only areas present in both A and B are selected

Question 2

The union overlay method uses what Boolean operator?

Answer 2

The Boolean OR, which is inclusive of all/any data point

Question 3

The Intersect overlay method does what?

Answer 3

Preserves only features that fall within the area extent common to both the input and output layers (AND)

Question 4

What does the dissolve tool do?

Answer 4

It can remove boundaries between polygons that have the same value of a select attribute (remove dividing lines)

Question 5

What is a buffer?

Answer 5

A regional of spatial proximity computed around one or more objects in a layer

Question 6

What does the clip tool do?

Answer 6

Extract the features of one layer based on the shape of features in the second layer

Question 7

The symmetrical difference overlay method uses what Boolean operator?

Answer 7

XOR, the exclusive or, which makes conditions mutually exclusive (A or B maybe true but not A AND B)

Question 8

What are two possible causes error propagation in overlay operations?

Answer 8

Inaccuracies of attribute data, and/or digitizing errors