Be a little more tolerant in handling non-perpendicular sensor components

[jsaul]

The orientation of three sensor components is supposed to be mutually perpendicular, but this is not always achieved (particularly the separate STS-1 horizontal components). We therefore tolerate up to 5 degrees of deviation from perfect perpendicularity. This includes all deviations from perpendicularity that can be found at least in the global networks.

[gempa-dirk]

@jsaul

The check for the number of components has been recently implemented with DataModel::numberOfComponents() and I recommend using it instead of re-implementing. See https://github.com/SeisComP/main/blob/e6e395a3a36b2f5d766579b8434396cff6abd400/apps/tools/inventory/scinv/check.cpp#L472

For an example.

Should the relaxation be discuss with the community?

[jsaul]

DataModel::numberOfComponents is good news. However, in the code block you are probably referring to I am not only counting components, but collecting the matching streams (usually three) for further handling. Therefore it is not a re-implementation of DataModel::numberOfComponents.

Regarding discussion with the community. What do you want to discuss and with whom? Whether SeisComP should be enabled to process data from certain STS-1's or not?

[jsaul]

Note also that in more than 99 percent of the sensors used, the components are already perpendicular by design. The allowance of up to 5 degrees (rather than one degree) simply reflects the reality of some stations in important networks plus some safety margin.

[gempa-dirk]

The allowance of up to 5 degrees (rather than one degree) simply reflects the reality of some stations in important networks plus some safety margin.

True. So if you think that 5 degrees are acceptable and this is common sense, then go for it.

[gempa-jabe]

Thanks. And we will address the other issues in separate PRs or commits.