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# (C) Copyright 2017- ECMWF.
#
# This software is licensed under the terms of the Apache Licence Version 2.0
# which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
#
# In applying this licence, ECMWF does not waive the privileges and immunities
# granted to it by virtue of its status as an intergovernmental organisation
# nor does it submit to any jurisdiction.
"""
Metview Python use case
UC-05. The Analyst retrieves certain parameters, computes a derived
parameter and plots its values for a specific time.
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1. Analyst filters, the chosen parameters of a file from a given
source (i.e. MARS, files, observation databases)
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
2. Analyst computes the desired derived parameter (i.e. wind velocity from zonal
and meridional components)
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
3. Analyst plots the derived parameter values
--------------------------------------------------------------------------------
"""
import metview as mv
uv = mv.read("./uv.grib")
u = mv.read(data=uv, param="u")
v = mv.read(data=uv, param="v")
wind_speed = mv.sqrt(u * u + v * v)
mv.setoutput(mv.png_output(output_width=1000, output_name="./uvplot"))
mv.plot(wind_speed)
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