EM 1110-2-2907
1 October 2003
Stereo model
Three-dimensional visual impression produced by viewing a pair of
overlapping images through a stereoscope.
Stereo pair
Two overlapping images or photographs that may be viewed
stereoscopically.
Stereopsis
The ability for objects to be perceived in three dimensions as a result of
the parallax differences produced by the eye base.
Stereoscope
Binocular optical device for viewing overlapping images or diagrams.
The left eye sees only the left image, and the right eye sees only the
right image.
SSU
Stratosphere Sounding Unit, carried by NOAA-series satellites.
Subscene
A portion of an image that is used for detailed analysis.
Subtractive primary colors
Yellow, magenta, and cyan. When used as filters for white light, these
colors remove blue, green and red light, respectively.
Sunglint
Bright reflectance of sunlight caused by ripples on water.
Sun-synchronous
Earth satellite orbit in which the orbit plane is nearly polar and the
altitude is such that the satellite passes over all places on earth having
the same latitude twice daily at the same local sun time.
Sun-synchronous orbit
A polar orbit where the satellite always crosses the Equator at the same
local solar time.
Supervised classification
Digital-information extraction technique in which the operator provides
training-site information that the computer uses to assign pixels to
categories.
Surface phenomenon
Interaction between electromagnetic radiation and the surface of a
material.
Surface roughness
See roughness.
Synthetic-aperture radar
Radar system in which high azimuth resolution is achieved by storing
(SAR)
and processing data on the Doppler shift of multiple return pulses in
such a way as to give the effect of a much longer antenna.
Synthetic stereo images
Stereo images constructed through digital processing of a single image.
Topographic data are used to calculate parallax.
System
Combination of components that constitute an imaging device.
Systematic distortion
Geometric irregularities on images that are caused by known and
predictable characteristics.
T
Target
Object on the terrain of specific interest in a remote sensing
investigation.
TDRS
Tracking and Data Relay Satellite
Telemeter
To transmit data by radio or microwave links.
Terrain
Surface of the earth.
Texture
Frequency of change and arrangement of tones on an image.
Thematic Data
Thematic data layers in a data set are layers of information that deal
with a particular theme. These layers are typically related information
that logically go together. Examples of thematic data would include a
data layer whose contents are roads, railways, and river navigation
routes.
Thematic Mapper (TM)
A cross-track scanner deployed on Landsat that records seven bands
of data from the visible through the thermal IR regions.
Thermal capacity (c )
See heat capacity.
Thermal conductivity (K)
Measure of the rate at which heat will pass through a material,
expressed in calories per centimeter per second per degree
Centigrade.
Thermal crossover
On a plot of radiant temperature versus time, the point at which
temperature curves for two different materials intersect.
Thermal diffusivity (k)
Governs the rate at which temperature changes within a substance,
expressed in centimeters squared per second.
Glossary-28
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