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ENS Tephigram 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 ************************************
#
# read ENS data
data = read("ens_prof.grib")
# define profile location
location = [17.51, -7.04]
# the starting x coordinate of the sidebar on the right.
# Wind and dewpoint depression is plotted there.
# Do not change it!
sidebar_x_offset = 1000
# the ensemble size (perturbed members)
ens_num = 50
# filter control (cf) and perturbed (pf) forcasts
g_cf = read(data: data, type: "cf")
g_pf = read(data: data, type: "pf")
# extract thermo profile for cf
nc = thermo_grib(
data: g_cf,
point_extraction: "nearest_gridpoint",
coordinates: location
)
prof_cf = thermo_data_values(nc, 1)
# extract thermo profile for pf
nc = thermo_grib(
data: g_pf,
point_extraction: "nearest_gridpoint",
coordinates: location
)
prof_pf = thermo_data_values(nc, 1)
# define colours for shaded areas
t_col_outer = 'RGB(1.0000,0.7922,0.7961)'
t_col_inner = 'RGB(0.8863,0.0000,0.0000)'
td_col_outer = 'RGB(0.8,0.9137,0.8)'
td_col_inner = 'RGB(0.3882,0.7765,0.3843)'
ddep_col_outer = 'RGB(0.8118,0.8902,1)'
ddep_col_inner = 'RGB(0.4353,0.6314,1)'
# define colours for curves
t_col_line = 'RGB(0.8706,0,0)'
td_col_line = 'RGB(0,0.2784,0.007843)'
ddep_col_line = 'RGB(0,0.3725,1)'
# define cf curve data
t_cf = prof_cf.t
td_cf = prof_cf.td
ddep_cf = (t_cf - td_cf) + sidebar_x_offset
# get pressure levels for t and td (from pf)
# and compute ENS mean profiles
lev_num = count(prof_pf.p)/ens_num
p = vector(lev_num)
t_mean = vector(lev_num)
td_mean = vector(lev_num)
ddep_mean = vector(lev_num)
for i=1 to lev_num do
# get pressure
p[i] = prof_pf.p[(i-1)*ens_num+1]
# get t and td for all the perturbed members
idx_start = (i-1)*ens_num+1
idx_end = i*ens_num
t_v = prof_pf.t[idx_start, idx_end]
td_v = prof_pf.td[idx_start, idx_end]
# add t and td from cf
t_v = merge(t_v, |t_cf[i]|)
td_v = merge(td_v, |td_cf[i]|)
# compute means
t_mean[i] = mean(t_v)
td_mean[i] = mean(td_v)
ddep_mean[i] = mean(t_v - td_v) + sidebar_x_offset
end for
# compute areas (polygons) for t, td and dew point depression (ddep)
# outer area = full ENS range
# inner area = 25-75 percentile range
p_poly = vector(lev_num*2)
t_poly_inner = vector(lev_num*2)
t_poly_outer = vector(lev_num*2)
td_poly_inner = vector(lev_num*2)
td_poly_outer = vector(lev_num*2)
ddep_poly_inner = vector(lev_num*2)
ddep_poly_outer = vector(lev_num*2)
for i=1 to lev_num do
# collect t and td (pf+cf) for the given level
t_v = prof_pf.t[(i-1)*ens_num+1, i*ens_num]
td_v = prof_pf.td[(i-1)*ens_num+1, i*ens_num]
t_v = merge(t_v, |t_cf[i]|)
td_v = merge(td_v, |td_cf[i]|)
i_left = i
i_right = lev_num*2 - i + 1
p_poly[i_left] = p[i]
p_poly[i_right] = p[i]
t_poly_outer[i_left] = minvalue(t_v)
t_poly_outer[i_right] = maxvalue(t_v)
perc = percentile(t_v, |25, 75|)
t_poly_inner[i_left] = perc[1]
t_poly_inner[i_right] = perc[2]
td_poly_outer[i_left] = minvalue(td_v)
td_poly_outer[i_right] = maxvalue(td_v)
perc = percentile(td_v, |25, 75|)
td_poly_inner[i_left] = perc[1]
td_poly_inner[i_right] = perc[2]
ddep_v = t_v - td_v + sidebar_x_offset
ddep_poly_outer[i_left] = minvalue(ddep_v)
ddep_poly_outer[i_right] = maxvalue(ddep_v)
perc = percentile(ddep_v, |25, 75|)
ddep_poly_inner[i_left] = perc[1]
ddep_poly_inner[i_right] = perc[2]
end for
# generate graphic objects (areas) for the shaded areas
gr_lst = [
xy_area(t_poly_outer, p_poly, t_col_outer),
xy_area(t_poly_inner, p_poly, t_col_inner),
xy_area(td_poly_outer, p_poly, td_col_outer),
xy_area(td_poly_inner, p_poly, td_col_inner),
xy_area(ddep_poly_outer, p_poly, ddep_col_outer),
xy_area(ddep_poly_inner, p_poly, ddep_col_inner)
]
# generate graphic objects (curves) for the mean ENS and cf profiles
gr_lst = gr_lst & [
xy_curve(t_mean, p, t_col_line, "solid", 4),
xy_curve(td_mean, p, td_col_line, "solid", 4),
xy_curve(ddep_mean, p, ddep_col_line, "solid", 4),
xy_curve(t_cf, prof_cf.p, t_col_line, "dash", 3),
xy_curve(td_cf, prof_cf.p, td_col_line, "dash", 3),
xy_curve(ddep_cf, prof_cf.p, ddep_col_line, "dash", 3)
]
# generate graphic object for wind profile from cf
wind_x = vector(count(prof_cf.p_wind))
for i=1 to count(wind_x) do
wind_x[i] = sidebar_x_offset + 10
end for
vis = input_visualiser(
input_plot_type : "xy_vectors",
input_x_values : wind_x,
input_y_values : prof_cf.p_wind,
input_x_component_values : prof_cf.u,
input_y_component_values : prof_cf.v
)
wind_plotting = mwind(
wind_field_type : "flags",
wind_flag_colour : "charcoal"
)
gr_lst = gr_lst & [vis, wind_plotting]
# define title
title_txt = "ENS Tephigram Date: " & prof_cf.date & " " & prof_cf.time & " UTC " &
" Lat/Lon: " & prof_cf.lat & "/" & prof_cf.lon
title = mtext(
text_lines: title_txt,
text_font_size: 0.5,
text_colour: "charcoal"
)
# define thermodynamic grid
grid = mthermogrid(
thermo_isotherm_colour : 'RGB(0.2577,0.6364,0.5039)',
thermo_isotherm_reference_colour : "blue",
thermo_dry_adiabatic_colour : "grey",
thermo_dry_adiabatic_label_frequency : 2,
thermo_mixing_ratio_colour : 'RGB(0.2577,0.6364,0.5039)',
thermo_mixing_ratio_label_colour : 'RGB(0.2577,0.6364,0.5039)',
thermo_mixing_ratio_label_font_size : 0.4,
thermo_grid_layer_mode : "foreground"
)
# define thermodynamic view
view = thermoview( type : "tephigram",
minimum_temperature : -110,
maximum_temperature : 30,
subpage_clipping: "on")
# define the output plot file
setoutput(pdf_output(output_name : 'ens_tephigram'))
# generate the plot
plot(view, gr_lst, grid, title)
ENS Tephigram Example
"""
ENS Tephigram
"""
# **************************** 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 numpy as np
import metview as mv
# read ENS data
data = mv.read("ens_prof.grib")
# define profile location
location = [17.51, -7.04]
# the starting x coordinate of the sidebar on the right.
# Wind and dewpoint depression is plotted there.
# Do not change it!
sidebar_x_offset = 1000
# the ensemble size (perturbed members)
ens_num = 50
# filter control (cf) and perturbed (pf) forcasts
g_cf = mv.read(data=data, type="cf")
g_pf = mv.read(data=data, type="pf")
# extract thermo profile for cf
nc = mv.thermo_grib(
data=g_cf,
point_extraction="nearest_gridpoint",
coordinates=location
)
prof_cf = mv.thermo_data_values(nc, 0)
# extract thermo profile for pf
nc = mv.thermo_grib(
data=g_pf,
point_extraction="nearest_gridpoint",
coordinates=location
)
prof_pf = mv.thermo_data_values(nc, 0)
# define colours for shaded areas
t_col_outer = 'RGB(1.0000,0.7922,0.7961)'
t_col_inner = 'RGB(0.8863,0.0000,0.0000)'
td_col_outer = 'RGB(0.8,0.9137,0.8)'
td_col_inner = 'RGB(0.3882,0.7765,0.3843)'
ddep_col_outer = 'RGB(0.8118,0.8902,1)'
ddep_col_inner = 'RGB(0.4353,0.6314,1)'
# define colours for curves
t_col_line = 'RGB(0.8706,0,0)'
td_col_line = 'RGB(0,0.2784,0.007843)'
ddep_col_line = 'RGB(0,0.3725,1)'
# define cf curve data
t_cf = prof_cf["t"]
td_cf = prof_cf["td"]
ddep_cf = (t_cf - td_cf) + sidebar_x_offset
# get pressure levels for t and td (from pf)
# and compute ENS mean profiles
lev_num = int(len(prof_pf["p"])/ens_num)
p = np.empty(lev_num)
t_mean = np.empty(lev_num)
td_mean = np.empty(lev_num)
ddep_mean = np.empty(lev_num)
for i in range(len(p)):
# get pressure
p[i] = prof_pf["p"][i*ens_num]
# get t and td for all the perturbed members
idx_start = i*ens_num
idx_end = (i+1)*ens_num - 1
t_v = prof_pf["t"][idx_start:idx_end]
td_v = prof_pf["td"][idx_start:idx_end]
# add t and td from cf
t_v = np.append(t_v, t_cf[i])
td_v = np.append(td_v, td_cf[i])
# compute means
t_mean[i] = mv.mean(t_v)
td_mean[i] = mv.mean(td_v)
ddep_mean[i] = mv.mean(t_v - td_v) + sidebar_x_offset
# compute areas (polygons) for t, td and dew point depression (ddep)
# outer area = full ENS range
# inner area = 25-75 percentile range
p_poly = np.empty(lev_num*2)
t_poly_inner = np.empty(lev_num*2)
t_poly_outer = np.empty(lev_num*2)
td_poly_inner = np.empty(lev_num*2)
td_poly_outer = np.empty(lev_num*2)
ddep_poly_inner = np.empty(lev_num*2)
ddep_poly_outer = np.empty(lev_num*2)
for i in range(lev_num):
# collect t and td (pf+cf) for the given level
idx_start = i*ens_num
idx_end = (i+1)*ens_num - 1
t_v = prof_pf["t"][idx_start:idx_end]
td_v = prof_pf["td"][idx_start:idx_end]
t_v = np.append(t_v, t_cf[i])
td_v = np.append(td_v, td_cf[i])
i_left = i
i_right = 2*lev_num - i - 1
p_poly[i_left] = p[i]
p_poly[i_right] = p[i]
t_poly_outer[i_left] = mv.minvalue(t_v)
t_poly_outer[i_right] = mv.maxvalue(t_v)
perc = mv.percentile(t_v, [25, 75])
t_poly_inner[i_left] = perc[0]
t_poly_inner[i_right] = perc[1]
td_poly_outer[i_left] = mv.minvalue(td_v)
td_poly_outer[i_right] = mv.maxvalue(td_v)
perc = mv.percentile(td_v, [25, 75])
td_poly_inner[i_left] = perc[0]
td_poly_inner[i_right] = perc[1]
ddep_v = t_v - td_v + sidebar_x_offset
ddep_poly_outer[i_left] = mv.minvalue(ddep_v)
ddep_poly_outer[i_right] = mv.maxvalue(ddep_v)
perc = mv.percentile(ddep_v, [25, 75])
ddep_poly_inner[i_left] = perc[0]
ddep_poly_inner[i_right] = perc[1]
# generate graphic objects (areas) for the shaded areas
gr_lst = [
mv.xy_area(t_poly_outer, p_poly, t_col_outer),
mv.xy_area(t_poly_inner, p_poly, t_col_inner),
mv.xy_area(td_poly_outer, p_poly, td_col_outer),
mv.xy_area(td_poly_inner, p_poly, td_col_inner),
mv.xy_area(ddep_poly_outer, p_poly, ddep_col_outer),
mv.xy_area(ddep_poly_inner, p_poly, ddep_col_inner)
]
# generate graphic objects (curves) for the mean ENS and cf profiles
gr_lst.extend([
mv.xy_curve(t_mean, p, t_col_line, "solid", 4),
mv.xy_curve(td_mean, p, td_col_line, "solid", 4),
mv.xy_curve(ddep_mean, p, ddep_col_line, "solid", 4),
mv.xy_curve(t_cf, prof_cf["p"], t_col_line, "dash", 3),
mv.xy_curve(td_cf, prof_cf["p"], td_col_line, "dash", 3),
mv.xy_curve(ddep_cf, prof_cf["p"], ddep_col_line, "dash", 3)
])
# generate graphic object for wind profile from cf
vis = mv.input_visualiser(
input_plot_type = "xy_vectors",
input_x_values = [sidebar_x_offset + 10 for i in prof_cf["p_wind"]],
input_y_values = prof_cf["p_wind"],
input_x_component_values = prof_cf["u"],
input_y_component_values = prof_cf["v"]
)
wind_plotting = mv.mwind(
wind_field_type = "flags",
wind_flag_colour = "charcoal"
)
gr_lst.extend([vis, wind_plotting])
# define title
title_txt = "ENS Tephigram Date: {} {} UTC Lat/Lon: {}/{} ".format(
prof_cf["date"], prof_cf["time"], prof_cf["lat"], prof_cf["lon"])
title = mv.mtext(
text_lines=title_txt,
text_font_size=0.5,
text_colour="charcoal"
)
# define thermodynamic grid
grid = mv.mthermogrid(
thermo_isotherm_colour = 'RGB(0.2577,0.6364,0.5039)',
thermo_isotherm_reference_colour = "blue",
thermo_dry_adiabatic_colour = "grey",
thermo_dry_adiabatic_label_frequency = 2,
thermo_mixing_ratio_colour = 'RGB(0.2577,0.6364,0.5039)',
thermo_mixing_ratio_label_colour = 'RGB(0.2577,0.6364,0.5039)',
thermo_mixing_ratio_label_font_size = 0.4,
thermo_grid_layer_mode = "foreground"
)
# define thermodynamic view
view = mv.thermoview( type = "tephigram",
minimum_temperature = -110,
maximum_temperature = 30,
subpage_clipping= "on")
# define the output plot file
mv.setoutput(mv.pdf_output(output_name = 'ens_tephigram'))
# generate the plot
mv.plot(view, gr_lst, grid, title)