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To make use of the new features of Magics, Metview 4 uses a new Contouring icon. One feature of Metview 3 which is not directly available in Metview 4 is Contour Splitting. This was a feature which enabled different isoline styles to be applied above, below and on a particular threshold (typically zero, for the purpose of examining the difference between two fields). To emulate this behaviour in Metview 4 requires the creation of three separate contour icons which can then be dropped together into the plot (or converted into three separate calls to mcont). See Migration: Split Contours for example Macro code and plots. Automatic computation and plotting of isotachs is no longer supported in Magics. A small macro can be used to compute wind speed like this:
| Code Block |
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speed = sqrt(u*u + v*v) # where u and v are field(set)s of u and v wind components
plot(speed) |
In Macro, pcont is replaced by mcont.
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