GIS Dictionary

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NAD 1927

Acronym for North American Datum of 1927. The primary local horizontal geodetic datum and geographic coordinate system used to map […]

NAD 1983

Acronym for North American Datum of 1983. A geocentric datum and graphic coordinate system based on the Geodetic Reference System

nadir

1 [aerial photography] In aerial photography, the point on the ground vertically beneath the perspective center of the camera lens.

NAICS

[data structures] Acronym for North American Industry Classification System. A system for classifying individual business locations by their types of

NaN

[mathematics] Acronym for not a number.

natural breaks classification

[cartography] A method of manual data classification that seeks to partition data into classes based on natural groups in the

natural neighbors

An interpolation method for multivariate data in a Delaunay triangulation. The value for an interpolation point is estimated using weighted

navigate

[ESRI software] To interactively change the observer’s or target’s position using a tool designed for this purpose, such as the

navigation

1 [wayfinding] The combined mental and physical activities involved in traveling to a destination, often a distant or unfamiliar one.

Navstar

[GPS] The name of the U.S. Department of Defense’s Global Positioning System (GPS).

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