GrADS Tips and Tricks

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Reverse the vertical coordinate

set yflip on

    This is useful when making crossections with the new Genesis files in which the vertical levels are ordered 1 (.005 ) to 18 (.993).

Vint function

Please be aware the documentation for the vint function is not correct. The order of the arguments is given as:

    vint(expr,psexpr,const)

    and should be:

    vint(psexpr,expr,const)

    The explanation for these arguments in the documentation is still valid. Using the arguments in the improper order may give reasonable-looking results, so if you are using the vint function, please verify you are using it correctly.

    Example:
    Say we have a netCDF data file with specific humidity (q) at the 1000, 900, 850, 700, 500, 400, 300, and 200 mb levels and a surface pressure field (ps) in mb. We can calculate the vertically integrated water vapor:

    d vint(ps,q,200)

    This NCL script allows you to convert sigma level data to pressure level data and also gives the surface pressure field necessary for the vint function.

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More questions? See the online GrADS manual.