remote sensing Remote sensing is the acquisition of information about an 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 information about Ear ...

, ground sample distance (GSD) in a digital photo (such as an

orthophoto An orthophoto, orthophotograph, orthoimage or orthoimagery is an aerial photograph or satellite imagery geometrically corrected ("orthorectified") such that the scale is uniform: the photo or image follows a given map projection. Unlike a ...

) 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 image, or the smallest point in an all points addressable display device. In most digital display devices, pixels are the ...

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 detail an image holds. 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 how ...

, that is, the limitation due to sampling. GSD is also referred to as ground-projected sample interval (GSI) or 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/?id=4hBTUY_2BMIC&pg=PA1392&dq=%22ground+sample+distance%22

References

Aerial photography Photogrammetry Satellite imagery

See also

References