Fix Drift equations

Drift

Two times are selected (t₁ and t₂). These times are usually the times of two manual measurements.
The script calculates the slope of the manual measurements (m_M) and the transducer data at times t₁ and t₂ (m_T).
The drift is the difference in slope between the manual measurements and the transducer measurements (m_M - m_T) between the two times (m*(t₁ - t₂)).

$m = \frac{(M_{1}-T_{1})-(M_{2}-T_{2})}{t_{1}-t_{2}} = m_{M} - m_{T} = \frac{(M_{1}-M_{2})}{t_{1}-t_{2}} - \frac{(T_{1}-T_{2})}{t_{1}-t_{2}}$

Offsets

Offsets are calculated as follows
$b_{1} = (M_{1}-T_{1})$

$b_{2} = (M_{2}-T_{2})$

Scripts

All calculations for drift are done in the Drifting class.

breakpoints_calc breaks the transducer data into chunks based on the timing of the manual measurements. Note that sometimes manual measurements are made, but transducer data isn't downloaded. Each chunk is individually drift-corrected.
beginning_end collects all the relevant beginning and end points from the manual (M₁ at time t₁ and M₂ at time t₂) and transducer data (T₁ at time t₁ and T₂ at time t₂)
slope_intercept calculates the slopes and intercepts using the above formulas and the beginning and end points from beginning_end

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Fix Drift equations

Drift

Offsets

Scripts

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