I would like to define a GeoTiff coordinate transformation by a set of GCPs only. The intention is to publish the GeoTiff as a coverage in GeoServer.
However if I specify tie points only, GeoServer complains that I also need to specify the scale tag, which then results in only one tie point used, eg no inclination or shearing. Is this normal? Can't I use GCPs alone for projection?
On the other hand I could define a transform, but the transformation is rather limited compared to let say a set of 10 GCPs.
Thanks for any help,