GIS Analysis Functions

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

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

Conflation procedure of reconciling the positions of corresponding features in different layers (i.e. if two forests layers are off - conflation fixes)

Edge Matching adjusts the position features that extend across map boundaries ("postage-stamping" maps together and resolving the differences in features along their edges...)

Editing Functions slivers or splinters line snapping over- or undershoots  

Query Functions retrieve records in the attribute database according to the conditions specified by the operator

Overlay Operations arithmetic & logical overlay operations arithmetic - addition, subtraction, division, multiplication logical - where a specified set of conditions occur (or doesn't occur) together

Neighborhood Operations evaluate the characteristics of the area surrounding a specified location

Other Analyses

Connectivity Functions use functions that accumulate values over the area being traversed

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