GIS Dictionary

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NoData

[data capture] In raster data, the absence of a recorded value. NoData does not equate to a zero value. While […]

node

1 [ESRI software] In a geodatabase, the point representing the beginning or ending point of an edge, topologically linked to

noise

1 [remote sensing] In remote sensing, any disturbance in a frequency band. 2 [data quality] Any irregular, sporadic, or random

nominal data

[data structures] Data divided into classes within which all elements are assumed to be equal to each other, and in

nonsimple polygon

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

nonspatial data

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

normal distribution

[statistics] A theoretical frequency distribution of a dataset in which the distribution of values can be graphically represented as a

normal form

[database structures] A set of guidelines for designing table and data structures in a relational database. When followed, normal form

Normal template

[ESRI software] The template that is automatically loaded in ArcMap and contains all the standard toolbar and command default settings.

normalization

[data management] The process of organizing, analyzing, and cleaning data to increase efficiency for data use and sharing. Normalization usually

north arrow

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

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