Digital image processing in Remote Sensing | what is digital image | NTA UGC NET/JRF EVS

Remotely sensed data are usually digital image data. Therefore data processing in remote sensing is dominantly treated as digital image processing.
(1) Input data
There are two data sources; analog data and digital data. Digital data, for example multispectral scanner data, is converted from HDDT (high density digital tape) to CCT (computer compatible tape) for ease of computer analysis. Analog data for example, film must be digitized by an image scanner or drum scanner into digital image data.
(2) Reconstruction / Correction
Reconstruction, restoration and/or correction of radiometry and geometry should be undertaken in the process of preprocessing.
(3) Transformation
Image enhancement, spatial and geometric transformation and/or data compression is normally required to generate a thematic map or database.
(4) Classification
Image features are categorized, which is called labeling in image processing, using those techniques of learning, classification, segmentation and/or matching.
(5) Output
There are two output methods; analog output such as film or color copy, and digital output in the form of a database, which is usually used as one of the layers of geographic data in GIS (geographic information system).
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[@EVS4NTANET]

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[@anildhillon6081]

@@EVS4NTANET can you please tell me how much numericals are there in gis and how advance mathematics is used as I'm thinking of getting a GIS master's degree