Wavelength and orientation resolution comparison of spectral estimators for ocean wave systems on SPOT images
Résumé
We present the application of three different 2-D spectral estimators to remote sensing images. One is the well known Bartlett correlogram (BC), the other ones are the maximum entropy (ME) and the harmonic mean (HM) methods, both usually called "high resolution" spectral estimators. After a brief description of these methods, we consider their application to a synthetic image, in order to exhibit their ability to resolve closely-spaced 2-D waves. Then a SPOT image showing three crossed swell fields is analyzed, and results are compared with available buoy data. Finally, by applying these methods to a non-stationary wave field image, we perform appings of the surface phenomena involved in small regions. These experiments show that the HM method is a useful tool to estimate the wavelength and the propagation orientation of wave systems.