remote sensing Remote sensing is the acquisition of information about an physical object, object or phenomenon without making physical contact with the object, in contrast to in situ or on-site observation. The term is applied especially to acquiring inform ...

, ground sample distance (GSD) in a digital photo of the ground from air or space is the distance between

pixel In digital imaging, a pixel (abbreviated px), pel, or picture element is the smallest addressable element in a Raster graphics, raster image, or the smallest addressable element in a dot matrix display device. In most digital display devices, p ...

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 spatial resolution or

image resolution Image resolution is the level of detail of an image. The term applies to digital images, film images, and other types of images. "Higher resolution" means more image detail. Image resolution can be measured in various ways. Resolution quantifies ...

, that is, the limitation due to sampling. GSD is also referred to as ground-projected sample interval (GSI) and is related to the ground-projected instantaneous field of view (GIFOV).{{cite book , title = Encyclopedia of Optical Engineering , author = Ronald G. Driggers , publisher = CRC Press , year = 2003 , isbn = 978-0-8247-4251-5 , page = 1392 , url = https://books.google.com/books?id=4hBTUY_2BMIC&dq=%22ground+sample+distance%22&pg=PA1392

References

Aerial photography Photogrammetry Satellite imagery

See also

References