- 업종: 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.
The reduction in the intensity of radiation, with distance from its source due to atmospheric absorption and/or scattering; it does not include the inverse-square decrease of intensity of radiation with distance from the source. In a general sense, attenuation can be taken to mean any reduction of a physical variable; see also transmittance.
Industry:Aerospace
The relative spectral transmittance as a function of wavelength. Relative spectral response (RSR) measurements are assumed to be constant for all detectors covered by a common filter and are normalized to unity at peak response. There are currently no methods to check spectral stability with time from either on-orbit or ground measurements. Also see spectral striping.
Industry:Aerospace
The response of a material as a function of wavelength to incident electromagnetic energy, particularly in terms of the measurable energy reflected from and emitted by the material.
Industry:Aerospace
the revisit time of a satellite over a given geographic location. The revisit time for Landsat 4, 5, and 7 is 16 days. For Landsat 1, 2, and 3 it was 18 days.
Industry:Aerospace
The rotation of a spacecraft about its longitudinal axis (in the along-track direction) so as to cause a side-up or side-down attitude. The roll axis is referred to as the "y" axis. See attitude.
Industry:Aerospace
The rotation of a spacecraft about its vertical axis so as to cause the spacecraft's longitudinal axis to deviate left or right from the direction of flight. The yaw axis is referred to as the "Z" axis. See attitude.
Industry:Aerospace
The rotation of a spacecraft about the horizontal axis normal to its longitudinal axis (in the along-track direction) so as to cause a nose-up or nose-down, attitude. The pitch axis is referred to as the "x” axis. See attitude.
Industry:Aerospace
The science of measuring a quantity or quantities, transmitting the measured value to a distant station, and there interpreting, indicating, or recording the quantities measured. A telemetry link, such as the Tracking and Data Relay Satellite System, (TDRSS) is a system for transmitting data over long distances using radio techniques.
Industry:Aerospace
The sensor aboard Landsat 7 that picks up solar radiation reflected by, or emitted from the Earth.
Industry:Aerospace
The smallest, most elementary areal constituent of the grey shades considered by an investigator in an image. A resolution cell is referenced by its spatial coordinates. The resolution cell or formations of resolution cells can sometimes constitute the basic unit for pattern recognition in image data.
Industry:Aerospace
