- pyart.retrieve.grid_displacement_pc(grid1, grid2, field, level, return_value='pixels')[source]¶
Calculate the grid displacement using phase correlation.
Implementation inspired by Christoph Gohlke: http://www.lfd.uci.edu/~gohlke/code/imreg.py.html
Note that the grid must have the same dimensions in x and y and assumed to have constant spacing in these dimensions.
grid1, grid2 (Grid) – Py-ART Grid objects separated in time and square in x/y.
field (string) – Field to calculate advection from. Field must be in both grid1 and grid2.
level (integer) – The vertical (z) level of the grid to use in the calculation.
return_value (str, optional) – ‘pixels’, ‘distance’ or ‘velocity’. Distance in pixels (default) or meters or velocity vector in m/s.
displacement (two-tuple) – Calculated displacement in units of y and x. Value returned in integers if pixels, otherwise floats.