Digital imaging is used to identify objects on the surface as well as in the ground. These objects exist in three dimensions, but after making picture are two-dimensional. The unit of length is changing from meter or centimeter to pixel. There are methods for transforming coordinates from one dimension to another such as direct linear transformation method (dlt) and a flat four-point transformation method. By reading the coordinates of the objects in the pictures, in pixels, you can calculate length (i.e. In meters) using a transformation matrix.
- Brzózka j, dorobczyński l,. Matlab computing environment of scientific and technical (in polish) // warsaw, poland, 2008.
- Fuksa s, byrski w. Four-point method for identifying the transformation (in polish) /agh crakow, poland, 2005.