- A georeference is needed for raster maps and uses a coordinate system.
- A georeference is a service object, which stores the relation between the rows and
columns in raster map(s) and the ground-coordinates (X, Y).
- Two types of georeferences for raster maps were discussed here:
- Georeference corners, used for raster maps made from rasterizing vector
maps, and the resulting maps from operations on these maps. A georeference
corners is used for raster maps that are oriented to the north.
- Georeference tiepoints, used for satellite images, scanned aerial photographs
and other imported images, which may not be north-oriented.
- In the chapters 6 and 10 you will see that there are several other types of georeferences.
ILWIS