GIS Dictionary

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ground control

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[geodesy] A system of points with known positions, elevations, or both, used as fixed references in georeferencing map features, aerial […]

ground receiving station

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[remote sensing] Communications equipment for receiving and transmitting signals to and from satellites such as Landsat.

ground truth

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The accuracy of remotely sensed or mathematically calculated data based on data actually measured in the field.

group

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[Internet] In ArcGIS Online, a way to collaborate with other ArcGIS users and to exchange content related to a specific

group layer

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[ESRI software] A group of several layers that appear and act as a single layer. Group layers make it easier

GRS80

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[geodesy] Acronym for Geodetic Reference System of 1980. The standard measurements of the earth’s shape and size adopted by the

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