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# GIS Final

### intro to GIS geo 2426 final exam notes

TermDefinition
Extract functions select and clip
overlay functions erase, intersect, and union
proximity functions buffer
local operations collects data on a cell-by-cell basis and reports a single value on a cell-by-cell basis also known as spearing - can be applied to a single raster or multiple rasters
focal operation collects data on a neighborhood basis and reports a single value on a cell by cell basis also known as funneling
spatial analysis spatial relationships among map layers involves spatially evaluating traditional statistical procedures using one of four basic techniques for accessing/organizing the geo-registered data for analysis
zonal operations collects data on a region-wide basis and reports summary on a region wide basis also known as lacing
global operations collects data on a map-wide basis and reports results on a map-wide or cell-by-cell basis also known as plunging
Euclidean distance operation also a straight line operation - as crow flies - measures the distance from the center point of a cell to the center point of every other cell - units of measurement are in the same units as coordinate system of the layer used as input
combine -type of local operation - takes multiple input rasters and assigns a new value for each combination n the output raster
equal/greater than/less than frequency -type of local operation - determine for each cell how many times the input values obtained from a list of rasters fulfill the condition
rank/popularity - type of local operation - assigns an output value to each cell according to if they meet or not a specific criteria
neighborhood operations - data from both an input location and nearby locations are used to determine the output value of each pixel - focal cell (input value) is usually at the center of the neighborhood being examined - four types: 3X3, Circle, Annulus, Wedge
Created by: sofaah