GIS Dictionary

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

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

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

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

[mathematics] Acronym for not a number.

[coordinate systems] The datum established in 1929 by the U.S. Coast and Geodetic Survey as the surface against which elevation

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

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

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

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

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