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Create a new Macro icon and rename it outputs. Write a small macro to read the file z500.grib and plot it. If the macro is run in batch mode, the plot should be saved as a PDF file somewhere into /tmp; otherwise, plot it to the screena PNG file.
- Run the code in the Macro Editor and see what happens if your execute the macro.
- Go on the command line and change to the directory where the macro is located. Execute the macro from the command line outside Metview.
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This function is normally used within loops to generate output of each iteration on a separate page (or file). It is the only way to use different views on different pages - this is the main purpose of it.
To use newpage()
you need first to define a plot_superpage()
as shown in the example below.
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... dw = plot_superpage( pages : [plot_page(),plot_page()]] # use default page ) plot(dw[1], ...) newpage(dw) ... plot(dw[2], ...) |
Here we create two a default sized pages page with plot_page()
, which attach attaches to the super page. Than we assign each plot command to a page.
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Take the macro from the previous task and add a page where you visualise the same field but over Europe only.modify it to produce a 2-page output: the first page should be on a default Geographic View, the second should be over Europe only. Only plot the first field in the data. The result should be 2 PNG files or a 2-page PDF, depending on how you run the macro.
Further processing outside Metview
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If you have time, you might want to try out opening your SVG file from the first exercise above in inkscape and alter it and save it to a PNG.
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- We provided you with some example WMS icons. Try out the four WMS icons in the directory by visualising them.
- Edit the icons to see the catalogues of layers available.
- Drop the icon into a macro editor to explore how a WMS retrieval looks like.
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