GIS Dictionary

[physics] Energy that moves through space at the speed of light as different wavelengths of time-varying electric and magnetic fields. […]

[physics] The entire range of wavelengths (frequencies) over which electromagnetic radiation extends.

[map display] A mapping system that displays but does not allow for the spatial analysis of data.

[ESRI software] In geoprocessing in ArcGIS, a component of a model. Elements can be variables, such as input and derived

[geodesy] The vertical distance of a point or object above or below a reference surface or datum (generally mean sea

[symbology] A map element that displays a simplified representation of the terrain within a map’s extent. Elevation guides are designed

[ESRI software] A layer in ArcGlobe that has been categorized to help define the geometry of the globe surface.

[symbology] Hypsometric tint bands based on elevation ranges used in an elevation guide.

A geometric shape described mathematically as the collection of points whose distances from two given points (the foci) add up

1 [Euclidean geometry] A three-dimensional, closed geometric shape, all planar sections of which are ellipses or circles. An ellipsoid has