The following examples illustrate the differences in how Metview 4 can be used to emulate the Split Contour functionality of Metview 3. The key is to use three contour definitions instead of one.
Metview 3 code
![](/wiki/download/attachments/18286744/split-contour-metview3-thumb.png)
# Metview Macro # **************************** LICENSE START *********************************** # # Copyright 2012 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 ************************************ # NOTE: THIS EXAMPLE EXISTS FOR THE COMPARISON OF METVIEW 3 AND METVIEW 4 # FEATURES, AND SHOULD NOT BE USED AS A TEMPLATE FOR METVIEW 4 CODE. # --------------------------------------------------------------- # Tags: Contour,Metview3,MARS # Title: Split Contouring Metview 3 # Description: Demonstrates Metview 3's split contouring facility # --------------------------------------------------------------- data = retrieve(param:'t', levelist: 1000, grid: [1.5,1.5], date: -10) split = pcont ( contour_line_plotting: "split" ) # Define the output media to_psfile = output ( format : "postscript", destination : "file", ncopies : 1, file_name : "plot.ps" ) # Check the runmode and decide which media to putput the plot to mode = runmode() if mode = "execute" or mode = "batch" then setoutput(to_psfile) else setoutput(to_screen) end if dw = plot_superpage () plot (dw, data, split)
Metview 4 code
![](/wiki/download/attachments/18286744/split-contour.png)
# Metview Macro # **************************** LICENSE START *********************************** # # Copyright 2015 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 ************************************ # --------------------------------------------------------------- # Tags: Contour,Metview3,MARS # Title: Split Contouring Metview 4 # Description: Demonstrates how to emulate Metview 3's split # contouring facility using multiple Contouring # definitions in Metview 4 # --------------------------------------------------------------- data = retrieve(param:'t', levelist: 1000, grid: [1.5,1.5], date: -10) split_below = mcont ( contour_line_style : "dash", contour_highlight_style : "dash", contour_max_level : 0, contour_level_count : 5 ) split_above = mcont ( contour_line_colour : "red", contour_highlight_colour : "red", contour_min_level : 0, contour_level_count : 5 ) split_on = mcont ( contour_line_thickness : 3, contour_line_colour : "black", contour_highlight : "off", contour_max_level : 0, contour_min_level : 0 ) # Define the output media to_psfile = ps_output ( output_name : "plot" # extension is added automatically ) # Check the runmode and decide which media to putput the plot to mode = runmode() if mode = "execute" or mode = "batch" then setoutput(to_psfile) end if plot (data, split_below, split_above, split_on)