I have 10 U and V component wind data, retrieved from ECMWF era-interim reanalysis data. I know how to calculate magnitude and direction of wind from U and V component. I don't know the way to do for all positions.
Please give your valuable comments.
Thanks in advance
Hi vasudevan
This can be done in many ways according to your choice of platform or software.
Data visualisation and analysis tools like Ferret, Matlab,cdo etc will do your needs.
sample script in matlab to do it : modify according to ur need
s=dir('filename.nc') %%% load ur files
nc_dump(s(1).name) %% see the description of variables
lat=nc_varget(s(1).name,'lat'); %% change the varible name as in ur file
lon=nc_varget(s(1).name,'lon');
uwnd=nc_varget(s(1).name,'u10');
vwnd=nc_varget(s(1).name,'v10')
windspeed=sqrt(u.^2+v.^2);
(PLZ note For matlab sometimes u may need SNCTOOLS for carrying out the analysis with netcdf files : http://mexcdf.sourceforge.net/ )
http://ferret.pmel.noaa.gov/Ferret/home
best regards
shanas
See this blog, https://www.esri.com/arcgis-blog/products/product/analytics/displaying-speed-and-direction-symbology-from-u-and-v-vectors/
Use CDO on Linux. Command: cdo mulc, 57.3 -atan2 -mulc, -1 u10.nc -mulc, -1 v10.nc uv.nc (if the u and v components are in one NetCDF file)
or
cdo -O -chname,10u,wd -mulc,57.3 -atan2 -mulc,-1 -selname,10u fname.nc -mulc,-1 -selname,10v fname.nc wind_dir.nc (if the u and v components are in separate NetCDF files)
Patrick
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