The Impact of Horizontal Velocity on the APFO Ground Control Database

The control point database created and maintained at the Aerial Photography Field Office (APFO) is a valuable resource. As the database continues to grow, and the ground control points contained in it are used to determine the horizontal accuracy of all current and future aerial imagery programs contracted by APFO, many considerations are involved in making sure the database is sound both theoretically and structurally. The control point database is maintained and updated on a regular basis. New points are added, and obsolete or inferior points are deleted from the database to maintain its integrity. To further enhance the value and overall integrity of the database, it was proposed that a study be conducted to determine if the earth’s horizontal ground movement has a significant effect on the control points in the database.

Spotlight

Town of Hlohovec

The town of Hlohovec lays in southwest part of Slovakia, about 65 km northwest from Bratislava. The town lies in the western part of the Carpathian Valley beside the longest of the Slovak rivers, the Vah.

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Spotlight

Town of Hlohovec

The town of Hlohovec lays in southwest part of Slovakia, about 65 km northwest from Bratislava. The town lies in the western part of the Carpathian Valley beside the longest of the Slovak rivers, the Vah.

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