Glossary for Geospatial Science

control point:� Points, elevations, and/or cells which are used to establish map coordinate control for ungeoreferenced objects or objects that are to be used in a process such as Stereo Modeling. �In the manual mosaic process, a control point is a feature in a piece of the mosaic (such as a road intersection) for which the map coordinates are known.� In the raster-to-vector calibration process, a control point is a feature that is co-located between the ungeoreferenced raster object, and the georeferenced vector object overlay.� A control point may be something like a bend in a river or a road intersection that shows on both a raster object and an overlying vector object.� Tying control points together lets TNTmips adjust scale, orientation and geometric distortion between rasters and vectors.

TNTmips� georeferencing and registration processes rely on control points introduced and identified on the display with the mouse.� (See also: tie points)