Quiz 9: Managing Raster Data

Question 1

The raster model uses ____ to locate the raster on the earth’s surface.

Answer 1

an x-y coordinate for the corner pixel and cell dimensions

Question 2

Which of the following is NOT an advantage of the raster data model?

Answer 2

it can store many attributes in a small space

Question 3

If a polygon feature class is converted to a discrete raster using values in a text field, what happens?

Answer 3

each unique text value is assigned a unique integer to be stored in the pixel

Question 4

Nancy has a 10 MB raster with a cell size of 12 meters. She resamples it to 3 meters to match another raster she is using. What is the approximate size of the resampled raster?

Answer 4

160 MB

Question 5

Which one of the following rasters would be most likely to come in the form of a multiband raster?

Answer 5

a color aerial photograph

Question 6

The purpose of raster compression is ____.

Answer 6

to store rasters as smaller files

Question 7

Use the run-length encoding scheme to compress this raster row (AAAAABBBEEEEEEEGGGC).

Answer 7

5A3B7E3G1C

Question 8

Select the definition of the term “nearest-neighbor resampling”.

Answer 8

adopts the value of the original cell closest to the center of the new cell.