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Interface to min_alt in droplet.find_liquid #135

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@martin-rdz

@michaellonardi and me realized, that sometimes the min_alt = 100 in droplet.find_liquid is too high.
Our example would be Neumayer Station on 2025-12-03:

Image

As the liquid bit is not set, the classification also fails to detect the continuous liquid layer at around 1330-1420 UTC.
Ballon-borne and eye observations by the EPFL EERL team confirmed, that the cloud was not interrupted at that time.
Setting min_alt=70 produces more reasonable results:

Image

But to achieve this, I had to extract classify_measurements() and manually wrap parts of categorize.py, allowing for a kwargs hand down.
Is there a more elegant option to set these config values at a higher level available or foreseen?

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