Hello,

I have some two-dimensional arrays filled with data and want to display them using QwtSpectrogramPlot.
It all works fine for one array at a time but now I would like to display several on top of each other, each with its distinct QwtColorMap.
Imagine, maybe, that one array would be there to display the height of a geographical map and another array giving the flow rate of rivers.
(Optionally, a third boolean array could be given as a marker whether a spot has a river or not.)

What could be the best way to achieve this? Especially since I have not really understood how the QwtAlphaColorMap works in combination with a SpectrogramPlot. Can I use a SpectrogramPlot with an AlphaColorMap and a LinearColorMap together or how does it work?

Thanks for your help.