Multidimensional spectral estimation
Multidimension spectral estimation is a generalization of spectral estimation, normally formulated for one-dimensional signals, to multidimensional signals or multivariate data, such as wave vectors. == Motivation == Multidimensional spectral estimation has gained popularity because of its application in fields like medicine, aerospace, sonar, radar, bio informatics and geophysics.
Source: Wikipedia — Multidimensional spectral estimation (CC BY-SA 4.0)