opendrift
opendrift.elements
opendrift.export
opendrift.models
opendrift.readers
parse_oil_pdf
shyfem
hodograph
opendrift_animate
opendrift_animate_profile
opendrift_gui
opendrift_plot
readerinfo
opendrift.models.eulerdrift
opendrift.models.eulerdrift.diff
grad2d(f, dx, dy)
grad2d