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The smallest image patch produced by an optical unit at the focal plane of a camera can be appreciably larger than the size of pixels in the CCD used to record the image. This optical limit on spatial resolution, when taken into consideration together with the sensor’s influence on image quality, should always be a part of any estimation made of the ground sample distance (GSD) attributed to a camera...
The spatial resolution attributed to digital cameras is usually based on the number or size of the pixels in the sensor. On closer examination it can often be shown that the real limit to the level of detail recorded by a camera will in practice be due to the performance of the optical system. An example of how this happens is given with a comparison between two satellite camera systems.
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