Remote sensing of some of the terms explained

I have limited knowledge, only know some of the terms, now explain the following, for reference only, the rest of their own to check it!

Imaging spectrometer - imaging spectroscopy is in a specific spectral domain with high spectral resolution

while obtaining a continuous spectral image of the feature, mapping the spectral image of the feature

spectral image of the instrument called imaging spectrometer

Principal Component Analysis - a multivariate statistical analysis method in which a number of variables are transformed by a linear transformation in order to select fewer significant

important variables. A method of multivariate statistical analysis. Also known as principal component

analysis.

Brightness temperature - the temperature at which the brightness of the object to be measured is equilibrated at an effective wavelength of λ = 0.65 μm with the brightness of a standard

filament, and when the spectral

emissivity of the object, λε, is the same as the spectral emissivity of the blackbody at temperature Tb, the temperature of the blackbody, Tb, is referred to as the brightness temperature of the object, Ts.

Normalized NDVI (Normalized Vegetation Index) - NDVI is one of the important parameters reflecting the growth and nutritional information of crops

According to this parameter, we can know the nitrogen demand of crops in different

seasons,

and it has an important guiding role in the reasonable application of nitrogen fertilizer

Polar-orbiting satellites - DMSP (Defense Meteorological Satellite Program). DMSP (Defense Meteorological Sate-llite

Program) is DoD's polar-orbiting satellite program, and NOAA satellites

belong to the same category, but the configuration of remote sensors on the star is different

Geostationary satellites - operating orbit for the Earth's geostationary orbit of the artificial Earth satellites.

Because

and the ground at various points relative to the stationary, so the name.

Image fusion - image fusion refers to multiple sources of remote sensing images in accordance with certain algorithms

in the specified geographic coordinate system, the generation of new images

process.

Frequency domain image - A frequency domain image is simply a representation of the

function of a signal transformed into the frequency domain.