pvlib / pvanalytics / 717
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Identify when the sun is up based on power or irradiance (#67)

* Implementation of the PVFleets day/night detection algorithm

Add the function features.daytime.power_or_irradiance() to identify
day and night from power or irradiance data.

* Test only one day in the series with zeros at mid-day

It will not work if every day has the same hours zeroed, there is no
information at that point to detect that the zeroes are an anomaly.

* Ignore low-ghi times in daytime tests

I don't have a good way of knowing exactly how accurate the daytime
mask should be. Mainly what we want to test is whether the values
where clearsky GHI is 0 are flagged as night and the values where
clearsky GHI is large are flagged as day.

* Add daytime mask test with different timestamp spacings

Adds tests at 1-hour spacing and at 1-minute spacing.

* Handle arbitrary timestamp spacing

Adjust the derivative threshold and the minimum run lengths to account
for input with arbitrary, but uniform, timestamp spacing.

* Add test covering daylight savings shifts

Seems like a good idea to cover these time periods when dealing with
day/night filters. Required a change to the shoulder value, relaxing
the criteria slightly, but I think 3 W/m^2 is still strict enough.

* Test daytime edge case and missing data

- Test the edge case where data goes to 0 mid-day and stays zero
  throughout the rest of the day (low value/low derivative runs in to
  night time)

- Test missing data where missing data is marked with NaN and missing
  data is completely missing

* Correct errors in the day/night mask where night is too long

These errors arise when input data goes to zero (or low) shortly
before sunset and remains there in to night. After the midday errors
are corrected by _filter_midday_errors() and clipping is flagged as
day we look at the two-week rolling median of length of each daytime
period, flagging days where the daytime period is more t... (continued)

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Jobs
ID Job ID Ran Files Coverage
1 717.1 0
100.0
 Travis Job 717.1
2 717.2 0
100.0
 Travis Job 717.2
3 717.3 0
100.0
 Travis Job 717.3
4 717.4 0
100.0
 Travis Job 717.4
Source Files on build 717
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