EM 1110-2-2907
1 October 2003
SAMS
Stratospheric and Mesospheric Sounder, carried by Nimbus-7.
SAST (Scientific
SAST is an interdisciplinary team of senior scientists and engineers
Assessment and Strategy
from various Federal Government agencies assigned to assess and
Team)
report on the damage caused by the flood of 1993 and to provide
assistance and advice to Federal officials responsible for making
decisions with respect to the flood recovery in the Upper Mississippi
and Missouri River basin.
Satellite
An object in orbit around a celestial body.
Saturation
In the IHS system, represents the purity of color. Saturation is also the
condition where energy flux exceeds the sensitivity range of a detector.
SBUV
Solar Back-scatter Ultraviolet Instrument, carried by NOAA satellites.
Scale
Ratio of distance on an image to the equivalent distance on the ground.
Scan line
Narrow strip on the ground that is swept by IFOV of a detector in a
scanning system.
Scanner
An imaging system in which the IFOV of one or more detectors is swept
across the terrain.
Scanner distortion
Geometric distortion that is characteristic of cross-track scanner
images.
Scan skew
Distortion of scanner images caused by forward motion of the aircraft or
satellite during the time required for scanning completion.
Scattering
Multiple reflections of electromagnetic waves by particles or surfaces.
Scattering coefficient
Display of scatterometer data in which relative backscatter is shown as
curves
a function of incidence angle.
Scatterometer
Nonimaging radar device that quantitatively records backscatter of
terrain as a function of incidence angle.
Scene
Area on the ground that is covered by an image or photograph.
Scotopic vision
Vision under conditions of low illumination, when only the rods are
sensitive to light. Visual acuity under these conditions is highest in the
blue part of the spectrum.
Seasat
NASA unmanned satellite that acquired L-band radar images in 1978.
Sensitivity
Degree to which a detector responds to electromagnetic energy
incident on it.
Sensor
Device that receives electromagnetic radiation and converts it into a
signal that can be recorded and displayed as either numerical data or
an image.
Shaded relief
Shading added to an image that makes the image appear to have
three-dimensional aspects. This type of enhancement is commonly
done to satellite images and thematic maps utilizing digital topographic
data to provide the appearance of terrain relief within the image.
Shuttle imaging radar
L-band radar system deployed on the Space Shuttle.
(SIR)
Sidelap
Extent of lateral overlap between images acquired on adjacent flight
lines.
Side-looking airborne
An airborne side scanning system for acquiring radar images.
radar (SLAR)
Side-scanning sonar-
Active system for acquiring images of the seafloor using pulsed sound
waves.
Side-scanning system-
A system that acquires images of a strip of terrain parallel with the flight
or orbit path but offset to one side.
Signal
Information recorded by a remote sensing system.
Signal to noise radio (S/N)
The ratio of the level of the signal carrying real information to that
carrying spurious information as a result of defects in the system.
Silver halide
Silver salts that are especially sensitive to visible light and convert to
metallic silver when developed.
SIR
Shuttle Imaging Radar, synthetic-aperture radar experiments carried
aboard the NASA Space Shuttle in 1981 and 1984.
Glossary-26
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