Georeference - 52North/IlwisCore GitHub Wiki

A georeference defines the relation between rows and columns in a raster map and XY-coordinates. The location of pixels in a raster map is thus defined by a georeference. A georeference uses a coordinate system which may contain projection information. Polygon, segment and point maps merely use a coordinate system. A georeference is a support object, usually for several raster maps.

There are four main types of georeferences:

georeference corners	a North-oriented georeference to be used during rasterization of vector data or as the North-oriented georeference to which you want to resample maps
georeference tiepoints	a non-North-oriented georeference to add coordinates to a satellite image or to a scanned photograph, a scanned map, etc. without using a DTM
georeference direct linear	to add coordinates to a scanned photograph while using a DTM
georeference orthophoto	to add coordinates to a scanned aerial photograph while using a DTM and camera parameters