Raster

Question 1

What does “no data” mean when assigned to a grid cell in a raster?

Answer 1

That cell has no value

Question 2

A raster with a larger cell size has a _________ resolution than a raster with a smaller cell size.

Answer 2

Lower

Question 3

If a raster has a cell resolution of 30 meters, then the cell in the raster measures…

Answer 3

900 square meters

Question 4

A 3x3 raster grid with 10m resolution cells covers an area of…

Answer 4

900 square meters

Question 5

A higher cell depth (e.g. 16-bit) means that the cell can store _____ information than a lower cell depth (e.g. 8-bit)

Answer 5

More

Question 6

Give an example of a multiband raster

Answer 6

Satellite images

Question 7

What is Vectorization

Answer 7

The process of converting a raster to a vector

Question 8

When a polygon shapefile (vector) is converted to a raster, where does the cell value come from?

Answer 8

An attribute from the shapefile’s attribute table must be chosen for the cell value.

Question 9

What is the mosaic technique used for?

Answer 9

Knitting together several raster datasets into one raster

Question 10

What can the combine operation do?

Answer 10

Assign a unique output value to each unique combination of cell values from multiple rasters

Question 11

What extension in ArcGIS is used for raster data tools and derivations?

Answer 11

The Spatial Analyst extension

Question 12

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

Answer 12

OR

Question 13

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

Answer 13

AND