Advanced Materials Science Research

Satellite Imaging-uses

Satellite imagery depicts the surface of the Earth at different spectral, temporal, radiometric and increasingly detailed spatial resolutions, as determined by the sensing device of each collection system, and the orbital path of its reconnaissance platform. Spatial resolution refers to the smallest measurable area at ground level, the instantaneous field of view, which can be sensed by a given detector in a single pass. The scale of a sensing target determines a sensor 's adequacy in terms of its spatial resolution, detecting relatively minute features, such as glacial flutes or annual push moraines, requires imagery with very high spatial resolution. The spectral resolution of a sensor defines the span of wavelength range within the electromagnetic spectrum over which it is equipped for data collection. Spectral bandwidth is limited by spectral resolution, and is equivalent to wavelength. Sensors that have high spectral resolution partition the EM spectrum into many discrete bands. Those which near-continuously sample the spectrum are called hyperspectral sensors. Because remote sensing platforms are moving steadily in the aerospace, the interval of imaging between the adjacent scan lines is extremely short. 

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