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What are ground control points?

Updated: 9/15/2023
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Ground Control point(GCP)can be defined as a point on the surface of the earth of known location which is used to georeference image data sources such as remotely sensed image or scanned maps.

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Q: What are ground control points?
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What is the significance of ground control points to the map to be geo-referenced?

Ground Control Points, which are commonly referred to as "GCPs", allow images to be georeferenced to a higher degree of accuracy. Ground control points are locations on the earth which have been accurately surveyed for both their elevation and GPS location. Without these control points an images georeferencing is based solely off of the data from positioning hardware aboard the imager and a sensor model. In addition to the increased accuracy obtained by using GCPs, a Digital Elevation Model (DEM) should be used so that you correct for elevation errors.


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Ground Control point(GCP)can be defined as a point on the surface of the earth of known location which is used to georeference image data sources such as remotely sensed image or scanned maps.


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Is it normal to have a 220 volts from line to ground?

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