- Industry: Aerospace
- Number of terms: 16933
- Number of blossaries: 2
- Company Profile:
The Executive Branch agency of the United States government, responsible for the nation's civilian space program and aeronautics and aerospace research.
(1) In general, the point at which a further increase in input yields no further increase in output. (2) (optics) The presence of the maximum number of wavelengths over the spectral region contributing to a particular color. Contrast with hue (tint) and brightness (intensity), the other two components of a color.
Industry:Aerospace
(1) In image processing, a persistent difference (not due to sampling error) between the true value of a population characteristic and the value obtained through the estimator used resulting in a systematic distortion in the results. This may be due to a flaw in the measurement, the method of sample selection, or the technique of estimation. (2) A steady voltage inserted in series with an element of an electronic device to signal a desired operation.
Industry:Aerospace
(1) In name only; so-called. (2) Loosely, a rough designation or an approximation. (3) According to plan or design: a nominal flight check.
Industry:Aerospace
(1) In recording and reproducing, the unwanted disturbance within a useful frequency band, independent of whether or not a signal is present. The signal is not to be included as part of the disturbance. (2) In receivers, the random oscillation in the absence of signal modulation on the carrier. Ambient oscillations detected, measured, or recorded with the signal become part of the background noise. Included in this definition is the interference resulting from primary power supplies.
Industry:Aerospace
(1) Of pixels, the numerical ratio of the width of a pixel to its height. (2) Of images, the ratio of two perpendicular axes scales, or the ratio of image length to width.
Industry:Aerospace
(1) The area of terrain that is covered by the instantaneous field of view of a detector. The altitude of the remote sensing system and the instantaneous field of view of the detector determine the size of the ground resolution cell. (2) The smallest area on the ground that can be resolved on a Landsat image. Compare with resolution cell.
Industry:Aerospace
(1) The process of projecting an image (mathematically or graphically) from its plane onto another plane by translation, rotation, and/or scale change. (2) The process of defining such a plane through mathematical operations. See image transformation.
Industry:Aerospace
(1) The ratio of a distance on an image or map to its corresponding distance on the ground. The scale of an image varies from point to point because of tilt and relief, but is usually taken as f/H where f is the principal distance (focal length) of the sensor, and where H is the height of the sensor above mean ground elevation. Scale may be expressed as a ratio, e.g. 1:24,000; a representative fraction, e.g. 1/24,000; or an equivalence, e.g. 1 in = 2,000 ft.
Industry:Aerospace
(1) The ratio of the amount of electromagnetic energy reflected by a surface to the amount of energy incident upon it, often expressed as a percentage. Example: the albedo of the Earth is 34 percent. (2) The reflectivity of a body as compared to that of a perfectly diffusing surface at the same distance from the Sun, and normal to the incident radiation. Albedo may refer to the entire solar spectrum or merely to the visible portion.
Industry:Aerospace
(1) The recorded representation of an object produced by optical, electro-optical, optical-mechanical, or electronic means. It is the term generally used when the electromagnetic radiation emitted or reflected from a scene is not directly recorded on photographic film. (2) The optical counterpart of an object produced by a lens, mirror, or other optical system.
Industry:Aerospace
