Question 1

Why would georeferencing be with real-world data (and give an example of this)?

Accepted Answer

Georeferencing can be used to take datasets that do not have spatial reference and apply this spatial reference to them by aligning the data with referenced datasets.If data does not have a spatial reference (such as a set of plans or a hand-drawn scale diagram),it cannot be used in conjunction with other data layers in other forms of geospatial technology (for instance,it will not match with other data in a GIS,or will not properly align with a remotely sensed image).An example of this would be to take historic maps of an area and georeference them with current maps to see how areas have altered or changed over time.

Question 2

Which of the following would be the least desirable location for a control point?&#10;A)A cleared area in a construction zone&#10;B)The intersection of two streams&#10;C)The crossing of two roads&#10;D)The location where a driveway meets a street

Accepted Answer

A cleared area in a construction zone is temporary and subject to change, making it unreliable for a control point.

Question 3

Which method is used to change data from one map projection to another?&#10;A)Georeferencing&#10;B)Scaling&#10;C)Defining projections&#10;D)Reprojecting

Accepted Answer

Reprojecting involves converting data from one map projection to another. This is done by assigning each point on the source projection to a corresponding point on the destination projection. Georeferencing is used to align data to a known coordinate system, scaling is used to adjust the size of a map, and defining projections is the process of setting up a coordinate system for a map.

Question 4

Which method is used to align an unreferenced dataset with one that has spatial reference information?&#10;A)Scaling&#10;B)Reprojecting&#10;C)Georeferencing&#10;D)Defining projections

Accepted Answer

Georeferencing is the process used to align an unreferenced dataset with one that has spatial reference information, allowing for the integration of the dataset into a spatial framework.

Question 5

Calculating new locations and new pixel values for an image refers to&#10;A)skewing.&#10;B)translation.&#10;C)affining.&#10;D)resampling.

Accepted Answer

Calculating new locations and new pixel values for an image is known as resampling. This process involves changing the resolution or size of an image, and it requires the calculation of the new location and value of each pixel in the new image. Skewing, translation, and affining are all geometric transformations that can be applied to an image, but they do not involve the calculation of new pixel values.

Question 6

Control points are best described as&#10;A)areas on the map where the projection can easily change.&#10;B)points on the map that do not have spatial reference.&#10;C)points in the data that share the same datum,no matter how the datasets are altered.&#10;D)common locations used in aligning two datasets are.

Accepted Answer

Control points are common locations that are used to align two datasets. They are points in the data that share the same datum, no matter how the datasets are altered. Control points help to ensure that the datasets align accurately, and are commonly used in GIS and remote sensing applications.

Question 7

Which of the following would be the best location for a control point?&#10;A)The corner of a building&#10;B)The center of a landscaping display&#10;C)A location on a shoreline at low tide&#10;D)A location of a car on the roof of a parking garage

Accepted Answer

A control point should be in a fixed and well-defined location. The corner of a building is a good choice as it is a stable and easily identifiable point that can be used for navigation purposes. The other options are not ideal as the center of a landscaping display or a location on a shoreline at low tide can shift over time, and a car on the roof of a parking garage is not a fixed point.

Question 8

Which of the following describes the use of a real-world coordinate system for identifying locations?&#10;A)Spatial reference&#10;B)Spatial analysis&#10;C)Spatial scaling&#10;D)Spatial projection

Accepted Answer

A real-world coordinate system is used as a spatial reference to identify specific locations in a geographic area. This involves assigning a unique set of coordinates to each location, typically using latitude and longitude or x and y coordinates. Spatial analysis involves studying the spatial relationships between different locations, while spatial scaling refers to the process of determining the appropriate level of analysis for a particular geographic area. Spatial projection is the process of transforming data from one coordinate system to another.

Question 9

What are the four ways that the affine transformation may alter a dataset to match it up with another dataset?

Accepted Answer

The answer of What are the four ways that the...

Question 10

Which of the following indicates the best transformation of the data has taken place?&#10;A)A negative value for RMSE&#10;B)The lowest possible value for RMSE&#10;C)The highest possible value for RMSE&#10;D)An RMSE value of exactly (or as close as possible)to 1

Accepted Answer

The lowest possible value for RMSE indicates the best transformation of the data has taken place because it means that the model's predictions are very close to the actual values. A negative value for RMSE is not possible as it is a measure of the error and cannot be negative. The highest possible value for RMSE indicates that the model's predictions are very far from the actual values, indicating poor performance. An RMSE value of exactly 1 may or may not be good, depending on the context and the specific problem at hand.

Deck 3: How to Create a Map Layout With Arcgis