European Facility For Airborne Research

European Facility For Airborne Research June 28, 2022, 23:15

Terms - N



nadir: That point on a sphere vertically below the observer. The opposite of the zenith.

NASA: National Aeronautics and Space Administration. The National Aeronautics and Space Administration is the United States government agency responsible for the civilian space program as well as aeronautics and aerospace research.

NCAR: National Center for Atmospheric Research. The National Center for Atmospheric Research is a US federally funded research and development center (FFRDC) managed by the nonprofit University Corporation for Atmospheric Research (UCAR) and funded by the National Science Foundation (NSF)

NDVI: Normalized Difference Vegetation Index. NDVI is the most commonly used vegetation index for satellite imagery. The typical range of actual values is about 0.1 for bare soils to 0.9 for dense vegetation.

NetCDF: NetCDF (Network Common Data Form) is a set of software libraries and self-describing, machine-independent data formats that support the creation, access, and sharing of array-oriented scientific data.

NIR: Near infrared - The preferred term for the shorter wavelengths in the infrared region.

noise: Any unwanted disturbance affecting a measurement (as of a frequency band), especially that which degrades the information-bearing quality of the data of interest. Noise includes systematic or random sources.

noise equivalent delta temperature (NEdT): The change in temperature that yields a signal-to-noise ratio of unity (thermal sensors).

noise equivalent radiance (NER): Uncertainty in sensor measurements in terms of radiance units.

NSF: National Science Foundation. The National Science Foundation is a United States government agency that supports fundamental research and education in all the non-medical fields of science and engineering.

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