coerce_increasing_time

echopype.qc.coerce_increasing_time(ds: xarray.core.dataset.Dataset, time_name: str = 'ping_time', local_win_len: int = 100) → None

Coerce a time coordinate so that it always flows forward. If coercion is necessary, the input ds will be directly modified.

Parameters

dsxr.Dataset

a dataset for which the time coordinate needs to be corrected

time_namestr

name of the time coordinate to be corrected

local_win_lenint

half length of the local window within which the median pinging interval is used to infer the correct next ping time

Returns

the input dataset but with specified time coordinate coerced to flow forward

Notes

This is to correct for problems sometimes observed in EK60 data where a time coordinate (ping_time or time1) would suddenly go backward for one ping, but then the rest of the pinging interval would remain undisturbed.