I ran into a floating point precision issue when padding a trace out
to the requested starttime when the data block returned by the Edge
miniseed factory (but this is not an Edge issue, per se) was less
than what was requested.

My solution was to use `round()` instead of `int()` when converting
a time differential to a discrete number of samples. I'm confident
this is a robust fix for padding. I'm not sure if it also the proper
approach to the trimming, which seems to be a bit more sophisticated
in that is uses the `ceil()` method. In any case, I request some
feedback before merging this deceptively simple PR.

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Merge branch 'residual-edits' of https://github.com/pcain-usgs/geomag-algorithms into pcain-usgs-residual-edits

Erin (Josh) Rigler authored 4 years ago and Claycomb, Abram Earl committed 4 years ago

Turns out we had calibration values for the BRW/BRT sensor in the
PCDCP system, so I used these instead of the default Narold values.
Also, @bgeels said FDT is ready to go online, so we added an entry
for that. FRD was using default Narod calibration values in PCDCP,
so we just kept those.

Erin (Josh) Rigler authored 4 years ago and Claycomb, Abram Earl committed 4 years ago

Just using default Narod cal values.

Merge branch 'residual-edits' of https://github.com/pcain-usgs/geomag-algorithms into residual-edits

Erin (Josh) Rigler authored 4 years ago and Claycomb, Abram Earl committed 4 years ago

The actual calibration coefficints are filed in the GHSC, but due to
COVID-19 telework policies at the moment, it is not possible to go
and retrieve these. We've used nominal scaling values for the SJT
FGE fluxgate magnetometer here, providing only bare minimal info.
Once business returns to normal, this file should be updated for
SJT.

Refactor for readability - Looks good. The clean-up is making it a little easier to interpret the algorithm's logic, and TBH, I'm have some small doubts about the mathematical correctness of some things. But I'm pretty sure it faithfully captures the original spreadsheet logic, which is all we can do for now.