Geopositioning is used to establish a mathematical relationship between the dataset coordinates space and the Coordinate Reference System defined through the Georeferencing set of information. Geopositioning can be performed in several different ways : Geoposition_Insert, Geoposition_Points, Geoposition_Affine.

• The first type (Geoposition_Insert) is the most commonly used for (ortho-)rectified datasets. In this case, the dataset coordinate space is superimposable with the CRS. Suffice it to deliver a single insertion point and a scale for both coordinate axis. For raster datasets; the top left corner is then used as the insertion point and the ground size of a pixel is given.
• The second type (Geoposition_Points) is generally used for approximate geopositioning; it provides a set of points cited in both coordinate spaces (dataset and CRS);it is up to the display system to build-up a mathematical relationship in order ti interpolate between those points (polynomial, rubbersheeting, ...).
• The third case (Geoposition_Affine) is used for general linear transformation (rotation, scale, sheering). For instance, it can be used to establish a simple coordinate matching between paper cordinates of a scanned map and CRS coordinates.

Geopositioning types are exclusive to each other.