At a point on a surface and in a given direction, the radiant intensity of an element of the surface, divided by the area of the orthogonal projection of this element on a plane perpendicular to the given direction.

Energy emitted, transferred or received as radiation.

Set of all values a function f can take as its arguments vary over its domain.

Direction of the range vector.

Spatial resolution in the range direction.

Usually rectangular pattern of parallel scanning lines forming or corresponding to the display on a cathode ray tube.

[data structure] A raster is a data model used in GIS which are usually regularly-size rectangular or square shaped grid cells arranged in rows in columns.

The process of converting an image made up of cells into one described by lines and polygons.

a level of measurement that includes both extensive and derived measurements. The numerical values of the measurement have a meaningful zero reference and a fixed unit of measure

Refers generally to systems that respond (almost) immediately or synchronously to external events.

Hardware used to detect and record signals.

[data structure] A record in an attribute table row that specifies an instance of an entity. It represents a spatial feature in the dataset in a one-to-one relationship.

a programming procedure that invokes itself to subdivide a problem