Time-height Section 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 GRIB forecast data        
data = read("joachim_pl.grib")

# the hovmoeller view takes an area as an input.
# We define the location by shrinking down the area to a point
area =  [47,0,47, 0] #N/W/E/S

# read temperature fields and convert from K to C 
t = read(data: data, param: "t")
t = t - 273.16

# read u and v fields and computes wind speed
u = read(data: data, param: "u")
v = read(data: data, param: "v")
sp = sqrt(u^2 + v^2)
sp = grib_set_long(sp, ["paramId", 10])

# define isoline shading for speed
sp_cont = mcont(
    legend                       : "on",
    contour                      : "off",
    contour_level_selection_type : "interval",
    contour_max_level            : 90,
    contour_min_level            : 0,
    contour_interval             : 10,
    contour_label                : "off",
    contour_shade                : "on",
    contour_shade_colour_method  : "palette",
    contour_shade_method         : "area_fill",
    contour_shade_palette_name   : "m_purple_9"
    )
    
# define contouring for t
t_cont = mcont(
    contour_line_style           : "dash",
    contour_line_thickness       : 3,
    contour_line_colour          : "charcoal",
    contour_highlight            : "off",
    contour_level_selection_type : "interval",
    contour_interval             : 10,
    contour_label_height         : 0.4
    )

# define time axis
time_axis = maxis(
    axis_type                : "date",
    axis_tick_label_height   : 0.4,
    axis_date_type           : "hours",
    axis_days_label_height   : 0.4,
    axis_hours_label         : "on",
    axis_hours_label_quality : "high",
    axis_hours_label_height  : 0.3
    )

# define vertical axis
vert_axis = maxis(
    axis_tick_label_height   : 0.4,
    axis_title_text: "Pressure (hPa)",
    axis_title_height : 0.5
    )
    
# define hovmoeller view
view = mhovmoellerview(
    type         : "vertical_hovm",
    bottom_level : 1000,
    top_level    : 100,
    area: area,
    time_axis: time_axis,
    vertical_axis: vert_axis,
    subpage_y_position: 5 
    )
    
# define legend
legend = mlegend(
    legend_text_font_size : 0.3,
    legend_text_colour:  "charcoal"
    )

# define title
title = mtext(
    text_font_size: 0.4,
    text_colour:  "charcoal"
    )
   
# define the output plot file
setoutput(pdf_output(output_name : 'time_height_xs'))
    
# generate plot
plot(view, sp, sp_cont, t, t_cont, legend, title)

import metview as mv

#  **************************** 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 GRIB forecast data        
data = mv.read("joachim_pl.grib")

# the hovmoeller view takes an area as an input.
# We define the location by shrinking down the area to a point
area =  [47, 0, 47, 0] #N/W/E/S

# read temperature fields and convert from K to C 
t = mv.read(data=data, param="t")
t = t - 273.16

# read u and v fields and computes wind speed
u = mv.read(data=data, param="u")
v = mv.read(data=data, param="v")
sp = mv.sqrt(u**2 + v**2)
sp = mv.grib_set_long(sp, ["paramId", 10])

# define isoline shading for speed
sp_cont = mv.mcont(
    legend                       = "on",
    contour                      = "off",
    contour_level_selection_type = "interval",
    contour_max_level            = 90,
    contour_min_level            = 0,
    contour_interval             = 10,
    contour_label                = "off",
    contour_shade                = "on",
    contour_shade_colour_method  = "palette",
    contour_shade_method         = "area_fill",
    contour_shade_palette_name   = "m_purple_9"
    )
    
# define contouring for t
t_cont = mv.mcont(
    contour_line_style           = "dash",
    contour_line_thickness       = 3,
    contour_line_colour          = "charcoal",
    contour_highlight            = "off",
    contour_level_selection_type = "interval",
    contour_interval             = 10,
    contour_label_height         = 0.4
    )

# define time axis
time_axis = mv.maxis(
    axis_type                = "date",
    axis_tick_label_height   = 0.4,
    axis_date_type           = "hours",
    axis_days_label_height   = 0.4,
    axis_hours_label         = "on",
    axis_hours_label_quality = "high",
    axis_hours_label_height  = 0.3
    )

# define vertical axis
vert_axis = mv.maxis(
    axis_tick_label_height   = 0.4,
    axis_title_text= "Pressure (hPa)",
    axis_title_height = 0.5
    )
    
# define hovmoeller view
view = mv.mhovmoellerview(
    type         = "vertical_hovm",
    bottom_level = 1000,
    top_level    = 100,
    area= area,
    time_axis= time_axis,
    vertical_axis= vert_axis,
    subpage_y_position= 5 
    )
    
# define legend
legend = mv.mlegend(
    legend_text_font_size=0.3,
    legend_text_colour="charcoal"
    )

# define title
title = mv.mtext(
    text_font_size=0.4,
    text_colour="charcoal"
    )
   
# define the output plot file
mv.setoutput(mv.pdf_output(output_name = 'time_height_xs'))
    
# generate plot
mv.plot(view, sp, sp_cont, t, t_cont, legend, title)