Chapter 8 GEO

The main difference between the union and intersection overlay methods is that:

. the former preserves all features, attribute information, and spatial extents from an input layer, while the latter contains only the common features and attributes from both the input and overlay layers.

____ is the process of creating an output polygon layer containing a zone of a specified width around an input point, line, or polygon feature.

a. Buffering

In the context of geoprocessing operations, what is the function of the merge operation?

a. It combines features within a point, line, or polygon layer into a single feature with identical attribute information.

In the context of geoprocessing operations, what is the function of the select operation?

a. It creates an output layer based on a user-defined query that selects particular features from the input layer.

Which of the following is a feature of the intersection overlay method?

a. It employs the AND operator.

Which of the following best describes the dissolve operation?

a. It is a geoprocessing technique that removes the boundary between adjacent polygons with identical values.

In the context of geoprocessing operations, what is spatial join?

a. It is a hybrid between an attribute operation and a vector overlay operation that combines two feature dataset tables by a common attribute field.

Which of the following is true of a constant width buffer?

a. It requires users to input a value by which features are buffered.

Which of the following overlay methods is based on the polygon-in- polygon operation?

a. Union

Which of the following overlay methods uses the OR operator?

a. Union

The difference between line-on-line overlay and line-in-polygon overlay operations is that:

a. both the input and overlay layers are lines for the former, while the line is the input layer and polygon is the overlay layer for the latter.

Any operation used to manipulate spatial data is called _____.

a. geoprocessing

The difference between point-in-polygon overlay and polygon-on-point overlay operations is that

a. the point layer is the input and the polygon layer is the overlay layer for the former, while the polygon layer is the input and the point layer is the overlay layer for the latter.

Which of the following overlay methods uses the AND operator?

b. Intersection

In the context of geoprocessing operations, which of the following best describes the append operation?

b. It is a geoprocessing technique that combines adjacent polygon datasets into a single dataset without removing the boundary lines between appended layers.

_____ buffers only buffer the area inside of the polygon boundaries.

b. Setback

The _____ operation is a geoprocessing technique that combines adjacent polygon datasets into a single dataset but does not remove the boundary lines between them.

b. append

The _____ overlay method contains only the common features and attributes from both the input and overlay layers.

b. intersection

A(n) _____ is a series of concentric buffer zones that are created around the originating feature at user-specified distances.

b. multiple ring buffers

The difference between dissolve and append geoprocessing operations is that:

b. the former removes the boundary between adjacent polygons with identical values, while the latter combines adjacent polygon datasets into a single dataset without removing the boundary lines between appended layers.

The difference between polygon-on-line overlay and polygon-in-polygon overlay operations is that:

b. the polygon is the input and the line layer is the overlay layer for the former, while the polygon layer is the input as well as the overlay layers for the latter.

_____ is a geoprocessing setting that forces nearby vertices to be snapped together if they fall within a user-specified distance.

c. Cluster tolerance

In the context of geoprocessing operations, which of the following is true of the dissolve operation?

c. It does not remove the boundary line between appended layers.

Which of the following is true of the point-in-polygon overlay operation?

c. It requires a point input layer and a polygon overlay layer.

Which of the following overlay operations has the polygon layer as the input, and the line layer as the overlay?

c. Polygon-on-line

Which of the following geoprocessing operations is used to define a subset of the larger set of data points or locales?

c. Select

In the context of spatial analysis in GIS, the inaccuracies present in the original input and overlay layers that are carried through to an output layer is known as _____.

c. error propagation

The _____ is an overlay technique in which each line that has any part of its extent within the overlay polygon layer will be included in an output line layer.

c. line-in-polygon

The process of taking two or more different thematic maps of the same area and placing them on top of one another to form a new map is known as _____.

c. overlay

Which of the following is a feature of the union overlay method?

d. It preserves all features, attribute information, and spatial extents from both input layers.

The _____ is an overlay method that creates an output layer with the spatial extent of the input layer but includes attribute information from an overlay.

d. identity

The _____ geoprocessing operation combines features within a point, line, or polygon layer into a single feature with identical attribute information.

d. merge

The difference between setback buffers and doughnut buffers is that setback buffers:

d. only buffer the area inside of the polygon boundary.

The ____ is an overlay technique in which a polygon input and overlay layers are combined to create an output polygon layer with the extent of the overlay.

d. polygon-in-polygon

In the context of spatial analysis, a(n) _____ is a narrow gap formed when the shared boundary of two polygons do not meet exactly.

d. sliver

Which of the following is true of the clip overlay method?

e. All the attributes from the preserved portion of the input layer are included in the output.

In the context of GIS, what is a sliver?

e. It is a narrow gap formed when the shared boundary of two polygons do not meet exactly.

What is a constant width buffer?

e. It is a vector analysis tool used to address questions of proximity in a GIS.

Which of the following overlay operations requires a point input layer and a polygon overlay layer?

e. Point-in-polygon

Which of the following overlay methods uses the XOR operator?

e. Symmetrical difference

The difference between line-on-line overlay and polygon-on-point overlay operations is that:

e. both the input and overlay layers are lines for the former, while the polygon layer is the input and the point layer is the overlay layer for the latter.