define device co-ordinate in computer graphics.
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Answer:
Device coordinates are 2D pixel coordinates within the render target, with (0, 0) in the upper-left corner, X = right, Y = down. One arrives at device coordinates by applying the viewport transform to the normalized device coordinates; the viewport controls at what pixel offset and resolution the image appears in the render target. One thing that's important to note is that device coordinates are not integer values; they aren't indices of pixels. They're a continuous 2D coordinate system, using pixel-sized units, but in which fractional (subpixel) values are perfectly valid. Pixel centers lie at 0.5 offsets (like 0.5, 1.5, 2.5, ...) in this coordinate system.
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Group them under two categories – natural and created by human beings. (a) Wular (b) Dal (c) Nainital (d) Bhimtal (e) Gobind Sagar (f) Loktak (g) Barapani (h) Chilika (i) Sambhar (j) Rana Pratap Sagar (k) Nizam Sagar (l) Pulicat (m) Nagarjuna Sagar (n) Hirakund