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GIS Analysis Functions

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.

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GIS Analysis Functions

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  1. GIS Analysis Functions

  2. 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

  3. 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

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

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

  6. Editing Functions • slivers or splinters • line snapping • over- or undershoots

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

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

  9. Neighborhood Operations • evaluate the characteristics of the area surrounding a specified location

  10. Other Analyses

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

  12. 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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