GIS Dictionary

[non-ESRI software] In CAD, a collection of objects that can be associated to form a single object.

[federal government] A unit of U.S. census geography that is a combination of census blocks. A block group is the

A kriging method in which the average expected value in an area around an unsampled point is generated rather than

[ESRI software] In ArcGIS, a geocoding indexing process that reduces the number of potential matches that need to be checked.

[surveying] In surveying, a defective measurement that can be detected by a statistical test.

[mathematics] An expression, named for the English mathematician George Boole (1815-1864), that results in a true or false (logical) condition.

A GIS operation that uses Boolean operators to combine input datasets into a single output dataset.

[mathematics] A logical operator used in the formulation of a Boolean expression. Common Boolean operators include AND, which specifies a

[data models] The arcs that create the boundary line of a polygon coverage.

[surveying] A line separating adjacent political entities, such as countries or districts; adjacent tracts of privately-owned land, such as parcels;

A problem created during spatial analysis, caused by arbitrary or discrete boundaries being imposed on spatial data representing nondiscrete or