Coloured Wind Vectors Example

#Metview Macro

#  **************************** LICENSE START ***********************************
# 
#  Copyright 2020 ECMWF. This software is distributed under the terms
#  of the Apache License version 2.0. In applying this license, ECMWF does not
#  waive the privileges and immunities granted to it by virtue of its status as
#  an Intergovernmental Organization or submit itself to any jurisdiction.
# 
#  ***************************** LICENSE END ************************************
# 

# get data
use_mars = 0 # 0 or 1
if use_mars = 1 then
    # get data from MARS
    f = retrieve(
        levelist : 850,
        param    : ["u","v"],
        date     : 20171016,
        time     : 0,
        area     : [30,-40,60,30],
        grid     : [0.5,0.5]
        )

else
    # read from grib file
    f = read("ophelia_wind_850.grib")
end if

# define coastlines
coast = mcoast(
    map_coastline_colour            : "RGB(0.8353,0.8353,0.8353)",
    map_coastline_thickness         : 3,
    map_coastline_land_shade        : "on",
    map_coastline_land_shade_colour : "black",
    map_coastline_sea_shade         : "on",
    map_coastline_sea_shade_colour  : "RGB(0.27,0.27,0.27)",
    map_boundaries                  : "on",
    map_boundaries_colour           : "RGB(0.8353,0.8353,0.8353)",
    map_boundaries_thickness        : 2,
    map_label: "off"
    )
    
# define view
view = geoview(
    map_projection      : "polar_stereographic",
    map_area_definition : "corners",
    area                : [31.28,-21.36,57.2,23.93],
    coastlines: coast
    )

# define wind plotting
colour_wind = mwind(
    wind_thinning_factor                  : 0,
    legend                                : "on",
    wind_advanced_method                  : "on",
    wind_advanced_colour_selection_type   : "interval",
    wind_advanced_colour_max_value        : 55,
    wind_advanced_colour_min_value        : 0,
    wind_advanced_colour_level_interval   : 5,
    wind_advanced_colour_max_level_colour : "red",
    wind_advanced_colour_min_level_colour : "sky",
    wind_advanced_colour_direction        : "clockwise",
    wind_arrow_legend_text                : " M/S"
    )

# define the output plot file
setoutput(pdf_output(output_name : 'coloured_wind'))

# generate plot
plot(view, f, colour_wind)

"""
Coloured wind plot
"""

#  **************************** LICENSE START ***********************************
#
#  Copyright 2020 ECMWF. This software is distributed under the terms
#  of the Apache License version 2.0. In applying this license, ECMWF does not
#  waive the privileges and immunities granted to it by virtue of its status as
#  an Intergovernmental Organization or submit itself to any jurisdiction.
#
#  ***************************** LICENSE END ************************************
#

import metview as mv

# get data
use_mars = False

if use_mars:
    # get data from MARS
    f = mv.retrieve(
        levelist=850,
        param=["u", "v"],
        date=20171016,
        time=0,
        area=[30, -40, 60, 30],
        grid=[0.5, 0.5],
    )

else:
    # read from grib file
    f = mv.read("ophelia_wind_850.grib")

# define coastlines
coast = mv.mcoast(
    map_coastline_colour="RGB(0.8353,0.8353,0.8353)",
    map_coastline_thickness=3,
    map_coastline_land_shade="on",
    map_coastline_land_shade_colour="black",
    map_coastline_sea_shade="on",
    map_coastline_sea_shade_colour="RGB(0.27,0.27,0.27)",
    map_boundaries="on",
    map_boundaries_colour="RGB(0.8353,0.8353,0.8353)",
    map_boundaries_thickness=2,
    map_label="off",
)

# define view
view = mv.geoview(
    map_projection="polar_stereographic",
    map_area_definition="corners",
    area=[31.28, -21.36, 57.2, 23.93],
    coastlines=coast,
)

# define wind plotting
colour_wind = mv.mwind(
    wind_thinning_factor=0,
    legend="on",
    wind_advanced_method="on",
    wind_advanced_colour_selection_type="interval",
    wind_advanced_colour_max_value=55,
    wind_advanced_colour_min_value=0,
    wind_advanced_colour_level_interval=5,
    wind_advanced_colour_max_level_colour="red",
    wind_advanced_colour_min_level_colour="sky",
    wind_advanced_colour_direction="clockwise",
    wind_arrow_legend_text=" M/S",
)

# define the output plot file
mv.setoutput(mv.pdf_output(output_name="coloured_wind"))

# generate plot
mv.plot(view, f, colour_wind)