Knowledge Base Question

Channel flag for underwater pressure

Anne Deschamps gravatar

Anne Deschamps  June 3, 2015, 2:32 p.m.

I would like to make seed volumes and therefore seed dataless with underwater pressure.

From the manual seed (Appendix A page 135) I found that the channel code should be BDH, but I am not very plesed with the channel flag as W or H (weather or state-of-health).
In our observation this pressure is none of these, but a physical quantity related to the geophysical process that we are studying. It is similar for hydrophones…

What will be the impact on data processing with the common software for putting this channel flag to G? Is the channel flag fully described in the manual or do we have some latitude for the interpretation of what we are making the measurement of.

I think that the question is similar for all people who want to distribute Ocean Bottom Seismometer (OBS) data with hydrophone channels.

Thank you for some explanation so that we can make to right choice.

Sincerely
Anne Deschamps


Chad Trabant gravatar

Chad Trabant  accepted answer  staff  June 3, 2015, 2:33 p.m.

Hi Anne

We have many underwater pressure channels in our archive listed as Geophysical type, so using G should not be a problem at all. The W flag is for Weather or environment data and specifically lists pressure as a use case, but I would not hesitate to use G if you prefer that.

Cheers,

- Chad