Topological Overlay
In ArcGIS, geoprocessing operations, including topological overlay operations, are accessible through ArcToolbox.
Topological overlay is predominantly concerned with overlaying polygon data with polygon data, e.g. soils and forest cover. However, there are requirements for overlaying point, linear, and polygon data in selected combinations, e.g.
topological overlayAn analysis procedure for determining the spatial coincidence of geographic features. ARC/INFO supports overlay among and between all feature classes. See also identity, intersect and union.
Topological Overlay:
Co-Occurrence mapping in a vector GIS is accomplished by topological overlaying. Any number of maps may be overlayed to show features occurring at the same location.
topological overlay is the general name for overlay followed by planar enforcement
result may be information about relationships (new attributes) for the old (input) maps rather than the creation of new objects ...
topological overlay
A spatial operation in which two or more maps or layers registered to a common coordinate system are superimposed, either digitally or on a transparent material, ...
union
A topological overlay of two polygonal spatial data sets which preserves features that fall within the spatial extent of either input data set; that is, all features from both coverages are retained. See also intersect and identity.
Union - A topological overlay of two polygon coverages which preserves features that fall within the spatial extent of either input data sets, i.e. all features from both coverages are retained. See also Intersect and Identity.
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overlay See topological overlay.
overshoot That portion of an arc digitized past its intersection with another arc. See also dangling arc.
P
page extent Defines a rectangular portion of the graphics page to be displayed.
Map analysis (often termed overlay or topological overlay) was one of the first real uses of GIS.
In GIS, there are four traditional types of spatial analysis: spatial overlay and contiguity analysis, surface analysis, linear analysis, and raster analysis. It includes such GIS functions as topological overlay, buffer generation, ...
Common components of GIS analysis include database query and selection, database linking, buffering, topological overlay, clipping, dissolving, etc. This work is mainly done by GIS processing software.
 See also: Overlay, Vector, Attribute, GIS, Geographic
  
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