Hi Bruce,
thanks for this very nice and concise document on SoH. Attached are a few comments and suggestions from ETH. I hope this can be approved by FDSN in a relatively short time!
John
Add channel codes: the proposed time series channels also include guidelines for SEED channel code names so there is consistency across different manufacturers implementations.
Sampling rate: GPS channels are specified to be at 0.00005sps - equal to about four samples per day. This is very low sampling compared to the data actually measured. Also, it's not a fraction of 86400, meaning that daily files will not always have the same amount of samples. That's an unnecessary complication.
Sampling rate: instead of specifying an exact sampling rate value, rather specify a reasonable range for each type of data, which should include 1 per minute, so that what the manufacturers already have built would be within specification.