Possibly unexpected behavior of correlated_field
@gedenhof and I stumbled over the following behavior of the correlated field. We expected that the correlation structure in the correct units keeps unchanged when changing the target space's distances. Or in other words, if we increase the pixel distance, we just zoom out. And when we decrease the pixel distance, we zoom in. However, this doesn't seem to be the case, as you can see here: In the right plot, the pixel distance is a factor of 10 larger.
When we create fields with a fixed power spectrum, everything works as expected. Again, in the right plot, the pixel distance is a factor of 10 larger. Here the right plot is a zoomed out version of the left.
To us, this seems unintended, but we could not figure out how to change the correlated_field operator. @parras, @pfrank Could one of you help us to fix this, or explain why this is intended to be like this? pix_dist.py