I have three healpy maps (corresponding to three Stokes parameters at different frequencies) and I am trying to plot them together in the same map, to highlight differences. I want to do something like what is done in the big map in the first plot: https://sci.esa.int/web/planck/-/56323-planck-legacy-archive-foreground-component-maps . Is there a way of doing this? I have appreciated that Healpy does not have any functionality to create RGB maps from it.
Creating a RGB image out of 3 healpy maps
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You cannot do this in
healpy, but you can probably do withmatplotlib. You can project a map using amollweideprojection:https://matplotlib.org/stable/gallery/subplots_axes_and_figures/geo_demo.html
So you can get the 3 maps, normalize them appropriately (not sure if between 0 and 1 or 0 and 256), then combine them in a single 2D array where first row is R, second G and last B.
Then you can plot it with
imshow, see that the input ofimshowcan be aRGBarray:https://matplotlib.org/stable/api/_as_gen/matplotlib.pyplot.imshow.html