GIS Dictionary

[data capture] In raster data, the absence of a recorded value. NoData does not equate to a zero value. While the measure of a particular attribute in a cell may … Read more

1 [ESRI software] In a geodatabase, the point representing the beginning or ending point of an edge, topologically linked to all the edges that meet there. 2 [ESRI software] In … Read more

1 [remote sensing] In remote sensing, any disturbance in a frequency band. 2 [data quality] Any irregular, sporadic, or random oscillation in a transmission signal. 3 [telecommunications] Random or repetitive … Read more

[data structures] Data divided into classes within which all elements are assumed to be equal to each other, and in which no class comes before another in sequence or importance; … Read more

[data editing] A polygon that violates topological integrity by crossing its own boundary (usually by making a small loop).

[data management] Data without inherently spatial qualities, such as attributes.

[statistics] A theoretical frequency distribution of a dataset in which the distribution of values can be graphically represented as a symmetrical bell curve. Normal distributions are typically characterized by a … Read more

[database structures] A set of guidelines for designing table and data structures in a relational database. When followed, normal form guidelines prevent data redundancy, increase database efficiency, and reduce consistency … Read more

[ESRI software] The template that is automatically loaded in ArcMap and contains all the standard toolbar and command default settings. User interface customization that is saved in the Normal template … Read more

[data management] The process of organizing, analyzing, and cleaning data to increase efficiency for data use and sharing. Normalization usually includes data structuring and refinement, redundancy and error elimination, and … Read more

[symbology] A map symbol that shows the direction of north on the map, thereby showing how the map is oriented.

1 [coordinate systems] The distance north of the origin that a point in a Cartesian coordinate system lies, measured in that system’s units. 2 [coordinate systems] The positive y-value in … Read more

[navigation] Acronym for Notice to Airmen. An advisory bulletin containing information about the National Airspace System, typically time-sensitive information between publishing cycles, or corrections to published documents and charts.

[Internet] In ArcGIS Online, status message about your group membership request.