Ground Control Point

Ground Control Point. A point on the surface of the earth of known location (i.e. fixed within an established co-ordinate system) which is used to geo-reference Image data sources, such as remotely sensed images or scanned maps, ...

ground control point generalize To (1) reduce the number of points, or vertices used to represent a line; or (2) increase the cell size and resample data in a raster format.

Ground control point(s); Geodetic control point(s) GCRA Geographic and Cartographic Research and Applications Section ...

What is a Ground Control Point (GCP)? Answer: A precisely known UTM or Geographic coordinate of a point on the earth used to geolocate the image. GCPs are needed to create absolute geolocated DEMs.

Collection of Ground Control Points (GCPs) and Registration of Satellite Image into Project Database Ground control points were collected with the help of Satellite Image and a digital base maps was prepared. Well-distributed GCPs (e.g.

We tested the georeferencing performance of the system using ground control points. This analysis addresses only the final positioning performance, not considering the automated image sequence processing (thus, post-processing of images was used).

Identifiable points on the ground (ground control points) are used to determine distances and geometric properties of the image, including camera height above the ground, degree of tilt at the time the photo was taken, ...

One of the spin-off uses of these surveys is to set up specific ground control points that are needed to properly make measurements in aerial photos, especially, as we shall see, when these are to be used in making topographic maps.

Ground Control Point - GCP: Any point which is recognizable on both remotely sensed images, maps and aerial photographs and which can be accurately located on each of these.

Acquire control points to produce about 35 orthoimages and determine the correspondence between the ground control points and satellite image to produce correction models for Landsat 7 images using the source material provided (or made available) by ...

During this phase of aerotriangulation, the coordinates of both the ground control points and the photogrammetric points are measured and recorded in the model coordinate system.

The location of ground control points can be represented on maps and other cartographic products, ...

To determine elevation of a place, it must be surveyed, in reference to a ground control point. Part of a topographic map of Haleakala (Hawaii), showing elevation. [edit] Topography ...

This could be done through the reprocessing of raw image data with ground control points whose UTM coordinates were projected into the NAD83 framework.

image scanned from the diapositive or directly acquired from a digital sensor, 2) a digital elevation model with the same area of coverage as the digital orthophoto, 3) the image and ground coordinates of photo identifiable ground control points, 4) ...

controlling overlapping aerial photographs so they can be used for compiling features and extracting elevation data using analytical or softcopy plotters (see Stereo Data Capture). Because the controlled photos are linked to a ground control points, ...

to a known co-ordinate system on the basis of a set of selected points whose co-ordinates are known in both systems (given in the figure Overview of Coordinate Transformations as direct transformations). These points may be ground control points or ...

See also: Ground control, Control Point, Image, Information, Control Points