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What does Dots Per Inch (DPI) and Pixels Per Inch (PPI) mean?

A dot per inch (dpi) and pixel per inch (ppi) is a measure of the sharpness on a display screen or printed image. The dot pitch determines the absolute limit of the possible dots per inch or pixel per inch. However, the display resolution of pixels that is set up for the display is usually not as fine as the dot pitch. The dots per inch and pixels per inch for a given picture resolution will differ based on the overall size of the image, since the same number of pixels are being spread out over a different space. The standard DPI for high resolution scanned aerial photographic products is 1200. The standard DPI for medium resolution scanned aerial photographic products is 600.

Tags: Remote Sensing, Satellites