Map transformations

This page explains th process of map transformation and describes the map transformation methods available in MapTiler Engine.

Map transformation determines how your image gets converted into a map. The transformation itself happens after georeferencing the image.

MapTiler Engine selects the most suitable transformation method automatically. If you prefer another method, you can change it by clicking on the gear icon (top right) during georeferencing.

Scaled

Scaled transformation combines rotation, scaling, and translation. It doesn’t change angles or shapes, and preserves parallels.

It requires a minimum of 2 control points to be set in a line.

Similarity

Similarity transformation combines rotation, scaling, translation, and reflection. It doesn’t change angles or shapes, and preserves parallels.

It requires a minimum of 2 control points, but they don’t have to be set in a line.

Affine

The affine transformation is any transformation that preserves collinearity and ratios of distances.

It is a linear transformation that needs at least 3 control points.

Polynomial

Polynomial transformation calculates a polynomial equation that describes a curve crossing all of the control points.

TPS (Thin plate spline)

TPS transformation operates in three dimensions.

It requires multiple control points.