Ground sample distance
In remote sensing, ground sample distance in a digital photo of the ground from air or space is the distance between pixel centers measured on the ground. For example, in an image with a one-meter GSD, adjacent pixels image locations are 1 meter apart on the ground. GSD is a measure of one limitation to image resolution, that is, the limitation due to sampling.
GSD is also referred to as ground-projected sample interval or ground-projected instantaneous field of view.
