v.to.db: new variables to add
|Reported by:||mlennert||Owned by:|
|Keywords:||v.to.db eigenvalues bbox||Cc:|
[Going on with my series of notes on what would be great to have in GRASS:]
The eigenvalues of the covariance matrix of the coordinates of the vertices of a polygon represent the major and minor (+ medium in 3D) axes of an ellipse (ellipsoid in 3D) that approximates the polygon. These values can be used to approximate different variables in shape analysis (length, direction, asymmetry, etc). It would be great if v.to.db could calculate these values.
Change History (20)
follow-up: 5 comment:1 by , 9 years ago
|Summary:||v.to.db: add eigenvalues of covariance matrix of coordinates → v.to.db: new variables to add|