QGis: How to calculate the coordinates needed to georeferenced a map?

[harry_vdk]

Hi,

With in the corners of a topo map there are reference point, but how to fill the coordinates?

[WildCatNL]

Haven't tested this, but try installing the Lat Lon Tools plug-in (from QGis' plug-in manager); it might allow you to enter lat lon coordinates and scroll there.

William

[harry_vdk]

Found a different way.

Preparation:
- First make within qgis a print composer definition with the area of interest.
- have a marker on every corner.
- Export a tif image with the print composer.
- Georeference the generated tif and use the 4 corner markers as a reference point.
- Save the reference points.

From now select the needed layers:
- Export the tif
- Load the tif and the reference points within the Georeferencer tool, process the data, save the new tif.