Parameter Tree:
EARTH SCIENCE > SPECTRAL/ENGINEERING > RADAR > RADAR IMAGERY

Definition:
A mapping of the observed radar reflectivity of a scene, consisting of a
file of digital numbers assigned to spatial positions on a grid of
pixels.


Reference:
Glossary of Radar Terminology
http://www.geog.nottingham.ac.uk/~dee/rs/agrg/radar/radgloe2.html#i