GIS Dictionary

[mathematics] An expression, named for the English mathematician George Boole (1815-1864), that results in a true or false (logical) condition. For example, in the Boolean expression “HEIGHT > 70 AND … Read more

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 combination of conditions (A and B must be true); OR, … Read more

[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; or adjacent geographic zones, such as ecosystems. A boundary is … Read more

A problem created during spatial analysis, caused by arbitrary or discrete boundaries being imposed on spatial data representing nondiscrete or unbounded spatial phenomena. Boundary problems include edge effects, in which … Read more

[ESRI software] One of two types of feature weights that allow control of how labels are placed relative to polygon features in ArcMap. Higher feature weights prevent labels from being … Read more

[cartography] A division between adjacent political entities, tracts of private land, or geographic zones. Boundary lines may be imaginary lines, physical features that follow those lines, or the graphical representation … Read more

[surveying] An object that marks an accurately surveyed position on or near a boundary.

[ESRI software] In Survey Analyst – Cadastral Editor, an irregular mesh of parcel boundaries, connection lines and control points representing a cadastral fabric. A boundary network represents parcels implicitly joined … Read more

1 [cadastral and land records] A map that shows property lines and corner monuments of a parcel of land. 2 [cadastral and land records] The survey taken to gather data … Read more

[map display] The rectangle, aligned with the coordinate axes and placed on a map display, that encompasses a geographic feature or group of features or an area of interest. It … Read more