intro to GIS geo 2426 final exam notes
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Extract functions | select and clip
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| overlay functions | erase, intersect, and union
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| proximity functions | buffer
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| 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
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| focal operation | collects data on a neighborhood basis and reports a single value on a cell by cell basis also known as funneling
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| 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
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| zonal operations | collects data on a region-wide basis and reports summary on a region wide basis also known as lacing
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| 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
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| 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
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| combine | -type of local operation
- takes multiple input rasters and assigns a new value for each combination n the output raster
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| 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
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| rank/popularity | - type of local operation
- assigns an output value to each cell according to if they meet or not a specific criteria
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| 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
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Or sort by any of the columns using the down arrow next to any column heading.
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