Definitions for "PASSIVE SENSOR"
Keywords:  etm, sensor, landsat, noaa, emitted
Remote sensing instrument that collects radiation that is reflected or emitted by the Earth. For example, the Landsat ETM+ sensor is a passive remote sensor. [NOAA
One type of remote sensing instrument, a passive sensor picks up radiation reflected or emitted by the Earth. ETM+ is a passive remote sensing system.
A device which captures and records natural radiation reflectance levels.