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6 Georeferencing

This chapter can be skipped, if no unreferenced data are to be imported.

In order to import scanned raster maps to be later georeferenced two project regions need to be defined. The scanned maps are first imported in a XY location (without projection) and afterwards "equalized" (geocoded) in a second location with a defined coordinate system.

**Figure 13:** Implementation of georeferencing in GRASS
$\includegraphics[clip=true, width=\textwidth]{finalpix/transformation.eps}$

Subsections

1 Preparation for georeferencing
- 1 The optimal scan resolution
- 2 Creating the needed project regions
2 Georeferencing procedure
- 1 Choosing control points
- 2 Determining the correct transformation

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