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Lecture 7: Raster data analysis

Values in a raster can be:

continuous (elevation), discrete (landcover), absolute (temperature), coded (suitability classes)

which raster analysis types are there?

local, focal, zonal and global

What is the first step in applying Boolean operators?

reclassification

What is a focal operation?

it involves a focal cell and a set of surrounding cells. The surrounding cells are chosen for their distance and/or directional relationship to the focal cell

What are the four common neighborhood types?

rectangle, circle, annulus and wedge

What is a filter operation?

individual cell values are changed on the basis of neighbouring cell values

Why apply filter operations?

to smooth continuous surfaces/remove speckle/estimate form parameters/enhance changes

How do you get the slope?

it is usually estimated by the use of a filter operation

What is Aspect?

the direction of slope in degrees

What is a zonal operation?

it uses a group of cells defining a geographical area, a zone. they may be contiguous or non contiguous

What does a zonal operation measure?

It measures the geometry of each zone in the raster, such as area

What is the output of global functions?

the value for each cell in the output raster is potentially a function of all the cells combined from the various input raster datasets

True distance =

cell units x cell size

Distance in cell units =

sqrt((x)^2+(y)^2)

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