mån 14 jan 2013, 20:41#204467
Hej igen, tyvärr finns inte "affin" i QGIS, dessa är tillgängliga, någon annan som passar?
* The Linear algorithm is used to create a world-file, and is different from the other algorithms, as it does
not actually transform the raster. This algorithm likely won’t be sufficient if you are dealing with scanned
• The Helmert transformation performs simple scaling and rotation transformations.
• The Polynomial algorithms 1-3 are among the most widely used algorithms for georeferencing, and each
one differs by the degree of distortion introduced to match source and destination ground control points.
The most widely used polynomial algorithm is the second order polynomial transformation, which allows
some curvature. First order polynomial transformation (affine) preserves colliniarity and allows scaling,
translation and rotation only.
• The Thin plate spline (TPS) algorithm is a more modern georeferencing method, which is able to introduce
local deformations in the data. This algorithm is useful when very low quality originals are being
• The Projective transformation is a linear rotation and translation of coordinates
/Examinerad Skogmästare, Sveriges Lantbruksuniversitet
Småskogsbrukare i Dalarna