SSA/EGU comments

[chad-earthscope]

Submitted by @rmellors

For completeness
SSA 2022/Seattle Washington
• Important parameters for using a DAS dataset:
o Method of photonic estimation (dual-pulse, single-pulse, chirp, local oscillator) or at least require the category of photonic estimation (quantitative, non-quantitative)
o SEAFOM standard of noise level (e.g., noise level estimate in rad/rt-hz at 1, 5,10,50 km)
• Less important, but still relevant:
o provenance of location estimation (why, how, when, who)
o Dark fiber vs direct install
o Fiber owner
o Fiber operator
o OTDR for array (w provenance as fibers do change)

EGU 2022
(related) Ways to transfer large amounts of data?
Add trace start time to channel metadata? [but would this also imply sample rate and number of samples?

Other
Timing could be other than GPS (e.g., NTP or PTP).
Could add a timing metric for segments where timing lock was missing.
Ownership of the cable, location of the first repeater, depth of water (marine or lake)
Use a pointer to a file containing locations rather than repeat (implemented in July 25 version)
Add metadata version number
Add “user-defined” space