- 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.
A process by which a degraded image is restored to its original condition. Image restoration is possible only to the extent that the degradation transform is mathematically invertible.
Industry:Aerospace
A radio frequency band extending from approximately 2.0 to 4.0 gigahertz. It is part of the microwave portion of the electromagnetic spectrum.
Industry:Aerospace
A radio frequency band extending from approximately 8.0 to 12.5 gigahertz. It is part of the microwave portion of the electromagnetic spectrum and is used for some communications satellites and by X-band radar primarily for science and technology applications.
Industry:Aerospace
A range of wavelengths (or frequencies) of electromagnetic radiation that is assimilated by a substance.
Industry:Aerospace
A remote sensing image created using data collected from more than one band.
Industry:Aerospace
A satellite orbit that passes over, or very close to, both poles of the Earth. Landsat 4, 5, and 7 all had/have a near-polar orbit at 438 miles (705 kilometers) above the Earth.
Industry:Aerospace
A scanning radiometer which by use of a rotating or oscillating plane mirror can scan a path normal to the movement of the radiometer. The mirror directs incoming radiation to a detector, which converts it into an electric signal.
Industry:Aerospace
A spatial filter for which the grey shade assignment at coordinates (x, y) in the transformed image is made by some weighted average (linear combination) of grey shades located to a particular spatial pattern around coordinates (x, y) of the domain image. The linear spatial filter is often used to change the spatial frequency characteristics of the image. For example, a linear spatial filter, which emphasizes high spatial frequencies (high-pass), will tend to sharpen, the edges in an image. A linear spatial filter, which emphasizes the low spatial frequencies (low-pass), will tend to blur the image and reduce noise.
Industry:Aerospace
A specific type of lamp-based calibration system carried on-board an imager in space for the purpose of monitoring for possible radiometric changes in detector responsivity with time. The internal calibrators (ICs) on Landsat 4/5 TM consisted of 3 lamps that were sequentially cycled through 8 possible radiation levels. The IC on Landsat 7 ETM+ consisted of a single primary lamp, which was used during almost all acquisitions and a secondary or backup lamp. On both imagers, background and IC pulse values were taken on each scan as a shutter, which was synchronized with the scan mirror, obscured the ground image and projected a pre-launch calibrated radiance from the IC lamps onto the focal planes. Also see other on-board external full aperture and partial aperture solar calibrators. Also see calibration lamps.
Industry:Aerospace
