imagery client Discussion Papers | OGC

8.26 interface

named set of operations that characterise the behaviour of an element

8.27 metadata

data about the content, quality, condition, and other characteristics of data

8.28 metadata group

group of metadata that is input as one group at one time NOTE Metadata items are placed in different groups when they are expected to be input, or be updated by inputting a new version, at different times. For example, metadata that is common to multiple images, including a collection of images, is separated from metadata that differs for each image. Catalog-stored metadata is also separated from archive-stored metadata.

8.29 monoscopic image

a single image taken of a target

8.30 mosaicked image

image mosaic an image that combines two or more previously separate images

8.31 order of magnitude

approximation of a number that is probably within a factor of ten of being correct

8.32 original image

collected image without any modifications

8.33 orthorectified image

copy of an image in which image displacements due to camera tilt and terrain relief have been removed NOTE A digital orthophotograph.

8.34 panoramic camera

camera which takes a partial or complete panorama of the terrain NOTE Some designs utilize a lens which revolves about an axis perpendicular to the optical axis; in other designs, the camera itself is revolved by clockwork to obtain a panoramic field of view. See also frame camera. © OGC 2004 – All rights reserved 31

8.35 pixel

2-dimensional picture element that is the smallest nondivisible element of a digital image. In image processing, the smallest element of a digital image that can be assigned a grey level. NOTE This term originated as a contraction for “picture element”.

8.36 photogrammetry

use of aerial photographs to produce planimetric and topographic maps of the earths surface and of features of the built environment NOTE Effective photogrammetry makes use of ground control by which aerial photographs are carefully compared and registered to the locations and characteristics of features identified in ground-level surveys.

8.37 position

spatial reference of a point or an object

8.38 query language

computer language in which server requests are defined NOTE Query languages are often server-specific.

8.39 server request

set of instructions passed to the server to initiate desired operations, such as to retrieve needed information

8.40 stereoscopic images

two images of a single target allowing three-dimensional viewing of a target. NOTE 1 The two images or photographs must have sufficient overlap of detail to make possible stereoscopic examination of an object or an area common to both images. NOTE 2 The two or more images of the same object or target must be taken from different imaging positions in space, and thus different object viewing directions. These multiple images can be used to determine object position or dimensions in three-dimensions. Two stereoscopic images are often taken from different points along one flight path, but there are also stereoscopic images from different flight paths.

8.41 transformation

change of coordinates from one coordinate reference system to another coordinate reference system based on a different datum through a one-to-one relationship 32 © OGC 2004 – All rights reserved