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Plots a circle with a given radius in km onto any map projections. Internally, the circle is split into a number of segments and the returned result is an Input Visualiser object which can be passed to the plot() command along with an optional Graph Plotting object.
The first three parameters specify the centre and the radius (in km) of the circle. Parameter resolution defines the number of line segments to use to make up the circle.
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Convenience function to build an orography area object to be plotted in a Cross Section View with the given colour. The orography values are extracted from the first field in fieldset orog_fs and they must be in the same units as the vertical axis of the cross section. The cross section definition itself is taken from the xs_d Cross Section Data object (xs_d). The function returns a list containing an Input Visualiser and a Graph Plotting icon, which can be directly used in a plot() command.
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