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Hodograph from BUFR Example
#Metview Macro
# **************************** LICENSE START ***********************************
#
# Copyright 2019 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 BUFR data
b = read("temp.bufr")
# define station id
statid="78583"
# extract thermo profile
nc = thermo_bufr(
data : b,
station :stations(
search_key : "ident",
ident : statid
)
)
# get individual profiles as vectors
info = thermo_data_values(nc, 1)
p = info.p_wind
u = info.u
v = info.v
# define the hodograph background
hodo_incr = 5
hodo_highlight = [10,20,30]
hodo_labels = [10, 20, 30]
hodo_max = 35
hodo_colour = "black"
# define the wind speed bins and their associated colours
pres_bins = [1050,700,500,300,200,50]
pres_colours = ["red","kelly_green","sky","blue","magenta"]
# define horizontal and vertical axes
h_axis = maxis(
axis_position : "left",
axis_tick_label_height: 0.4
)
v_axis = maxis(
axis_position : "bottom",
axis_tick_label_height: 0.4
)
# the view
view = cartesianview(
x_automatic : "off",
x_min: -hodo_max,
x_max: hodo_max,
y_automatic : "off",
y_min: -hodo_max,
y_max: hodo_max,
horizontal_axis: h_axis,
vertical_axis: h_axis,
subpage_x_position: 10,
subpage_y_position: 5,
subpage_x_length: 80,
subpage_y_length: 80
)
# define the plot page and superpage.
# NOTE: In order to correctly render the hodograph (we want
# concentric circles instead of ellipses) we have to make sure
# that the physical width and height of the plot are the same.
# Please note that while the page size is defined in % the
# superpage size is defined in cm! See also subpage size in the view.
# size is in % of the physical size of the superpage!
hodo_page = plot_page(
top : 0,
bottom : 100,
left : 0,
right : 100,
view : view
)
# size is in cm!
dw = plot_superpage(
layout_size : "custom",
custom_width : 15,
custom_height : 15,
pages : hodo_page
)
gr_lst= nil
# build the concentric circles
sp = hodo_incr
while sp <= hodo_max do
xp = nil
yp = nil
d = 2 * pi/180
for j=1 to 360/2 + 1 do
xp = xp & [cos(j*d) * sp]
yp = yp & [sin(j*d) * sp]
end for
if find(hodo_highlight,sp) <> nil then
gr = xy_curve(xp, yp, hodo_colour, "solid", 3)
else
gr = xy_curve(xp, yp, hodo_colour, "solid", 1)
end if
gr_lst = gr_lst & [gr]
sp = sp + hodo_incr
end while
# build horizontal and vertical lines going
# throug the centre
gr_lst = gr_lst & [xy_curve(|-hodo_max,hodo_max|,|0,0|,
hodo_colour, "solid", 1)]
gr_lst = gr_lst & [xy_curve(|0,0|,|-hodo_max,hodo_max|,
hodo_colour, "solid", 1)]
# build labels on the horizontal line
vis = input_visualiser(
input_plot_type : "xy_point",
input_x_values : -hodo_labels & hodo_labels,
input_y_values : hodo_labels*0 & hodo_labels*0,
input_values: hodo_labels & hodo_labels
)
sym = msymb(
symbol_colour : hodo_colour,
symbol_text_font_size : 0.5,
symbol_text_font_style: "bold",
symbol_text_position: "bottom"
)
gr_lst = gr_lst & [vis, sym]
# build the graphical objects for the wind data (per bin)
gr_wind = nil
for i=1 to count(pres_bins)-1 do
# collect wind data in bin
u_val = nil
v_val = nil
for k=1 to count(p) do
if p[k] <> vector_missing_value and
u[k] <> vector_missing_value and
v[k] <> vector_missing_value and
p[k] <= pres_bins[i] and p[k] >= pres_bins[i+1] then
u_val = u_val & [u[k]]
v_val = v_val & [v[k]]
end if
end for
# build graph object
if u_val <> nil and v_val <> nil then
vis =input_visualiser(
input_x_values : u_val,
input_y_values : v_val
)
gr = mgraph(
legend: "on",
graph_line_colour : pres_colours[i],
graph_line_style : "solid",
graph_line_thickness : 5
)
gr_wind = gr_wind & [vis, gr]
end if
end for
# define legend with custom labels
legend_text = nil
for i=1 to count(pres_bins)-1 do
legend_text = legend_text & [pres_bins[i] & "-" & pres_bins[i+1]]
end for
legend = mlegend(
legend_display_type : "disjoint",
legend_text_font_size : 0.5,
legend_text_composition : "user_text_only",
legend_user_lines : legend_text
)
# define title
title_txt = "HODOGRAPH Date: " & info.date & " " & info.time & " UTC " &
" Station: " & info.station & " Lat/Lon: " & info.lat & "/" & info.lon
title = mtext(
text_lines: title_txt,
text_font_size: 0.5,
text_colour: "charcoal"
)
# define the output plot file
setoutput(pdf_output(output_name : 'hodograph'))
# generate the plot
plot(dw, gr_lst, gr_wind, legend, title)
Hodograph from BUFR Example
import metview as mv
import math
# **************************** LICENSE START ***********************************
#
# Copyright 2019 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 BUFR data
b = mv.read("temp.bufr")
# define station id
statid="78583"
# extract thermo profile
nc = mv.thermo_bufr(
data = b,
station = mv.stations(
search_key = "ident",
ident = statid
)
)
# get individual profiles as vectors. Values are sorted by descending
# pressure, no missing values includes.
info = mv.thermo_data_values(nc,0)
p = info["p_wind"]
u = info["u"]
v = info["v"]
# define the hodograph background
hodo_incr = 5
hodo_highlight = [10,20,30]
hodo_labels = [10, 20, 30]
hodo_max = 35
hodo_colour = "black"
# define the wind speed bins and their associated colours
pres_bins = [1050,700,500,300,200,50]
pres_colours = ["red","kelly_green","sky","blue","magenta"]
# define horizontal and vertical axes
h_axis = mv.maxis(
axis_position = "left",
axis_tick_label_height= 0.4
)
v_axis = mv.maxis(
axis_position = "bottom",
axis_tick_label_height= 0.4
)
# the view
view = mv.cartesianview(
x_automatic = "off",
x_min= -hodo_max,
x_max= hodo_max,
y_automatic = "off",
y_min= -hodo_max,
y_max= hodo_max,
horizontal_axis= h_axis,
vertical_axis= h_axis,
subpage_x_position= 10,
subpage_y_position= 5,
subpage_x_length= 80,
subpage_y_length= 80
)
# define the plot page and superpage.
# NOTE: In order to correctly render the hodograph (we want
# concentric circles instead of ellipses) we have to make sure
# that the physical width and height of the plot are the same.
# Please note that while the page size is defined in % the
# superpage size is defined in cm! See also subpage size in the view.
# size is in % of the physical size of the superpage!
hodo_page = mv.plot_page(
top = 0,
bottom = 100,
left = 0,
right = 100,
view = view
)
# size is in cm!
dw = mv.plot_superpage(
layout_size = "custom",
custom_width = 15,
custom_height = 15,
pages = hodo_page
)
gr_lst = []
# build the concentric circles
sp = hodo_incr
angle_incr = 2 * math.pi/180
while sp <= hodo_max:
xp = [math.cos(i*angle_incr)*sp for i in range(1,182)]
yp = [math.sin(i*angle_incr)*sp for i in range(1,182)]
if sp in hodo_highlight:
gr = mv.xy_curve(xp, yp, hodo_colour, "solid", 3)
else:
gr = mv.xy_curve(xp, yp, hodo_colour, "solid", 1)
gr_lst.append(gr)
sp += hodo_incr
# build horizontal and vertical lines going
# throug the centre
gr_lst.append(mv.xy_curve([-hodo_max,hodo_max],[0,0],
hodo_colour, "solid", 1))
gr_lst.append(mv.xy_curve([0,0],[-hodo_max,hodo_max],
hodo_colour, "solid", 1))
# build labels on the horizontal line
vis = mv.input_visualiser(
input_plot_type = "xy_point",
input_x_values = [-v for v in hodo_labels] + hodo_labels,
input_y_values = [0 for i in range(len(hodo_labels)*2)],
input_values = hodo_labels + hodo_labels
)
sym = mv.msymb(
symbol_colour = hodo_colour,
symbol_text_font_size = 0.5,
symbol_text_font_style= "bold",
symbol_text_position= "bottom"
)
gr_lst.extend([vis, sym])
# build the graphical objects for the wind data (per bin)
gr_wind = []
for i in range(len(pres_bins)-1):
# collect wind data in bin
u_val = []
v_val = []
for k in range(len(p)):
if (not math.isnan(p[k]) and not math.isnan(u[k]) and
not math.isnan(v[k]) and
p[k] <= pres_bins[i] and p[k] >= pres_bins[i+1]):
u_val.append(u[k])
v_val.append(v[k])
# build graph object
if u_val and v_val:
vis = mv.input_visualiser(
input_x_values = u_val,
input_y_values = v_val
)
gr = mv.mgraph(
legend = "on",
graph_line_colour = pres_colours[i],
graph_line_style = "solid",
graph_line_thickness = 5
)
gr_wind.extend([vis, gr])
# define legend with custom labels
legend_text = []
for i in range(len(pres_bins)-1):
legend_text.append(str(pres_bins[i]) + "-" + str(pres_bins[i+1]))
legend = mv.mlegend(
legend_display_type = "disjoint",
legend_text_font_size = 0.5,
legend_text_composition = "user_text_only",
legend_user_lines = legend_text
)
# define title
title_txt = "HODOGRAPH Date: {} {} Station: {} Lat/Lon: {}/{}".format(
info["date"], info["time"], info["station"], info["lat"], info["lon"])
title = mv.mtext(
text_lines = title_txt,
text_font_size = 0.5,
text_colour = "charcoal"
)
# define the output plot file
mv.setoutput(mv.pdf_output(output_name = 'hodograph'))
# generate the plot
mv.plot(dw, gr_lst, gr_wind, legend, title)