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The remote sensing world calls cell values are also called a digital number or dn.
Dn number in remote sensing. My bad the radiance values are scaled back to 8 bit dns in the 1b product making use of a single link band coefficient scaling factor. This allows for the equation. A single pixel may have several digital number variables corresponding to different bands recorded. Digital number dn in image processing the value of each pixel in a dataset.
Dn value is simply a digital number which represents the brightness value of a pixel. The range of energies examined in a remote sensing system is broken into 256 bins. Now when you begin with the brightness of a pixel it can be either brightest or darkest isnt it. This is the simplest way to understand dn value.
So we can have a completely black or completely white pixel correct. Digital number in remote sensing systems a variable assigned to a pixel usually in the form of a binary integer in the range of 0255 ie. Pages in category digital numbers the following 4 pages are in this category out of 4 total. In most of the imagery we work with the dn represents the strength of the signal amount of light that is assigned to each grid cell pixel.
Usually these values are 8 bit that is ranging from 0 255. Digital number dn in remote sensing the numerical value of a specific pixel. First thing first what is digital number dn. The band coefficients are in the aster users guide pp.
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