GIS

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Author:
jess3c
ID:
22123
Filename:
GIS
Updated:
2010-06-05 13:04:06
Tags:
vocab
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Description:
Chpt 12
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  1. Append
    A GIS operation that creates a new layer by piecing together two or more layers.
  2. Areal interpolation
    A process of transferring known data from one set of polygons to another.
  3. Buffering
    A GIS operation that creates zones consisting of areas within a specified distance of select features.
  4. Clip
    A GIS operation that creates a new layer that includes only those features of the input layer that fall within the area extent of the clip layer.
  5. Cluster tolerance
    A distance tolerance that forces points and lines to be snapped together if they fall within the specified distance.
  6. Dissolve
    A GIS operation that removes boundaries between polygons that have the same attribute value(s).
  7. Eliminate
    A GIS operation that creates a new layer by removing features that meet a user defined logical expression from the input layer.
  8. Erase
    A GIS operation that removes from the input layer those features that fall within the area extent of the erase layer.
  9. Error propagagtion
    The generation of errors in the overlay output that are due to inaccuracies of the input layers.
  10. G-statistic
    A spatial statistic that measures the clustering of high and low values in a data set. The G-statistic can be either general or local.
  11. Identity
    An overlay method that preserves only features that fall within the are extent defined by the input layer.
  12. Intersect
    An overlay method that preserves only those features falling within the area extent common to the input layers.
  13. Line-in-polygon overlay
    A GIS operation in which a line layer is dissected by the polygon boundaries on the overlay layer, and each line segment on the output combines attributes from the line layer and the polygon within which it falls.
  14. Local Indicators of Spatial Association (LISA)
    The local version of Moran's I.
  15. Minimum mapping unit
    The smallest area unit that is managed by a government agency or an organization.
  16. Moran's I
    A statistic that measures spatial autocorrelation in a data set.
  17. Nearest neighbor analysis
    A spatial statistic that determines if a point pattern is random, regular, or clustered.
  18. Overlay
    A GIS operation that combines the geometries and attributes of the input layers to create the output.
  19. Point-in-polygon overlay
    A GIS operation in which each point of a point layer is assigned the attribute data of the polygon within which it falls.
  20. Polygon-on-polygon overlay
    A GIS operation in which the output combines the polygon boundaries from the inputs to create a new set of polygons and each new polygon carries attributes from the inputs.
  21. Select
    A GIS operation that uses a logical expression to select features from the input layer for the output layer.
  22. Slivers
    Very small polygons found along the shared boundary of the two input layers in overlay.
  23. Spatial autocorrelation
    A spatial statistic that measures the relationship among values of a variable according to the spatial arrangement of the values. Also called spatial association or spatial dependence.
  24. Split
    A GIS operation that divides the input layer into two or more layers.
  25. Symmetrical Difference
    An overlay method that preserves features falling within the area extent that is common to only one of the input layers.
  26. Union
    A polygon-on-polygon overlay method that preserves all features from the input layers.
  27. Update
    A GIS operation that replaces the input layer with the update layer and its feature.

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