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GIS Analysis Functions
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Objectives To be able to explain what the following GIS analysis functions are: Transformations Conflation Edge Matching Editing Functions Query Functions Overlay Operations Neighborhood Operations Connectivity Functions
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Transformations Format Transformations - sometimes topology must be built Geometric Transformations - registration to a common coordinate system (rubber sheeting or warping) Between Geometric Projects - i.e. Latitude/Longitude to PLSS
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Conflation procedure of reconciling the positions of corresponding features in different layers (i.e. if two forests layers are off - conflation fixes)
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Edge Matching adjusts the position features that extend across map boundaries ("postage-stamping" maps together and resolving the differences in features along their edges...)
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Editing Functions slivers or splinters line snapping
over- or undershoots
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Query Functions retrieve records in the attribute database according to the conditions specified by the operator
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Overlay Operations arithmetic & logical overlay operations
arithmetic - addition, subtraction, division, multiplication logical - where a specified set of conditions occur (or doesn't occur) together
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Neighborhood Operations
evaluate the characteristics of the area surrounding a specified location
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Other Analyses
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Connectivity Functions
use functions that accumulate values over the area being traversed
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Conclusion GIS analysis functions use the spatial and non-spatial attribute data to answer questions about real-world Spatial analysis functions that distinguishes GIS from other information systems
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