Raster Algebra

Question 1

What are the four classes of raster algebra operations?

Answer 1

Focal, local, global, and zonal

Question 2

Explain local operations

Answer 2

• computes a new value for every location as a function of its values in the input layer
• includes arithmetic, statistical, trig, and regional

Question 3

What are the boolean operators in local operation?

Answer 3

• & (and), ~ (not), | (or)
• output is binary numbers

Question 4

What are the local operation tools: relational?

Answer 4

equal to, greater than, greater than and equal to, less than, less than or equal to, not equal to

Question 5

What are the local operation tools: logical?

Answer 5

diff, inlist, is null, over, test