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What is the role of spectral signature in remote sensing?

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asked 3 years ago in Science by Francis Abel Indaba (230 points)

5 Answers

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To differentiate between substances been analysed and classes to which each belong. It's usually in form of a graph. Akano oyedayo
answered 3 years ago by Akano Oyedayo Philli (140 points)
–1 vote
When solar radiation hits a target surface, it may be transmitted, absorbed or reflected. Different materials reflect and absorb diffrently at different wavelengths. The reflectance spectrum of a material is a plot of the fraction of radiation reflected as a function of the incident wavelength and serves as a unique signature for the material. In principle, a material can be identified from its spectral reflectance signature if the sensing system has sufficient SPECTRAL RESOLUTION to distinguish its spectrum from those of other materials. This premise provides the basis for multi-spectral remote sensing.
answered 3 years ago by anonymous
The features on the Earth reflect, absorb, transmit, and emit electromagnetic energy from the sun. A measurement of energy commonly used in remote sensing of the Earth is reflected energy for example near infrared, visible light which comes from land and water surfaces. A Special digital sensors have been developed to measure all types of electromagnetic energy as it interacts with objects in  Earth reflect, absorb, transmit, and emit electromagnetic. The ability of sensors to measure these interactions allows us to use remote sensing to measure features and changes on the Earth and in our atmosphere. There by knowing the amount of energy reflected from these surfaces is usually expressed as a percentage of the amount of energy striking the objects. Across any range of wavelengths, the percent reflectance values for landscape features such as water, sand, roads, forests, etc.
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Remote sensing is the technique of obtaining information about an object or phenomenom through the analysis of data collected by special instruments that are not in physical contact with the object of investigation. Usually the energy collected and measured in remote sensing has been EM radiation, visible & invisible thermal (heat) infrared, acoustic or sound energy (propagated under water) which is reflected or emitted in varying degrees by all natural and synthetic objects. SPECTRAL SIGNATURE is the specific combination of reflected and absorbed electro magnetic radiation at varying wavelenght which can UNIQUELY IDENTIFY an object, it refers to a plot of variation of reflected/absorped EM radiation as a function of wavelenght. Spectral Signature gives rise to the widely used approach to identifing and separately different materials or objects using multispectral(different light & colors based on wavelenght) data obtained by remote sensors.
answered 3 years ago by Daniel C Ben Anazia (140 points)
–1 vote
spectral signature also called spectral response curve is for identifying and separating different materials or substances with multispectral datas as obtained from remote sensors. For instance bio-organic molecules found in vegetables which gave multispectral datas observed when the radiations emitted are plotted against their wavelenghts can be distintively separated from other molecules.
answered 3 years ago by Ekheomo Fred (120 points)
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answered 1 year ago by zhongyikuangjiyj (23,520 points)

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