PyDDA wind retrieval using single DWR

Retrievals
1

Is there any example notebook available to use pydda for single DWR?

2

Hello, you would simply use the same workflows, but only use one Grid in the list of grids input into pydda.retrieval.get_dd_wind_field. Hope this helps!

3

Thanks @rcjackson for the suggestion. I tried the way but while initializing using era5 I am getting an error as “Grid is not subscriptable”. Can u please suggest what can be done to resolve it.

Command:

Grid1 = pydda.initialization.wind_fields.make_initialization_from_era5(Grid1, vel_field=‘corrected_velocity’, dest_era_file=f’./ERA_{str(xg1.time.dt.strftime(“%Y%m%d_%H%M%S”).values[0])}.nc’)

Error Msg:

TypeError Traceback (most recent call last)
/tmp/ipykernel_87775/582985091.py in
----> 1 Grid1 = pydda.initialization.wind_fields.make_initialization_from_era5(Grid1, vel_field=‘corrected_velocity’,
2 dest_era_file=f’./ERA_{str(xg1.time.dt.strftime(“%Y%m%d_%H%M%S”).values[0])}.nc’)

~/anaconda3/lib/python3.9/site-packages/pydda/initialization/wind_fields.py in make_initialization_from_era5(Grid, file_name, vel_field, dest_era_file, method)
93
94 grid_time = datetime.strptime(
—> 95 Grid[“time”].attrs[“units”], “seconds since %Y-%m-%dT%H:%M:%SZ”
96 )
97 hour_rounded_to_nearest_1 = int(round(float(grid_time.hour)))

TypeError: ‘Grid’ object is not subscriptable

4

Hello,

PyDDA 2.0 now uses an xarray-based Grid object for analysis. So, chances are, you probably loaded the grid using pyart.io.read_grid. We now have a function pydda.io.read_grid that will load this into the proper format for you.

Much regards,

Bobby