[Metadata] GEOFON part of issue 166

[javiquinte]

This is the GEOFON part from issue #166 .

This station has similar issue. The are several Station elements. One of them is open, as are the channels in there, but there are other Station elements which have closed epochs. It is again maybe not wrong, but it is dangerous, as one needs to go through all the Station element to find out if one is still open. Having one Station element sounds like a safe solution.
http://geofon.gfz-potsdam.de/fdsnws/station/1/query/?net=HU&station=BEHE&channel=???&level=response

The channels are named BH* here, but the sensor looks like a short-period with a corner period below 10 s
https://geofon.gfz-potsdam.de/fdsnws/station/1/query/?net=SJ&station=SVIS&channel=???&level=response

Here there are only SP epochs included, but there is a BB sensor installed too (and hence the station is not listed in the _ADARRAY)
http://geofon.gfz-potsdam.de/fdsnws/station/1/query/?net=SK&station=LANS&channel=???&level=response

[pevans-gfz]

Regarding HU.BEHE: Does the question refer to "open" with regard to time (epoch) or open in access? This station currently has 6 closed (in the past) epochs and one open one, starting 2025-06-10. It currently has BH* and HH* channels. In the past there was also SHZ, until 2017. The closed epochs for this channel indicate it is no longer available. All these channels have restrictedStatus="open" today, so access is a non-issue. It's possible this issue was fixed with new metadata we installed around June 11 this year.

https://geofon.gfz.de/fdsnws/station/1/query/?net=HU&station=BEHE&format=text&level=channel

A station's channels can and do change properties over time, so there's no avoiding epochs, and clients have to study them to understand what is available in inventory