Appendix 1 : Terminology and Naming Convention¶
Terminology¶
Terms used in the Fig. 1.1 and throughout this document are:
- data
Results of instrumentation measurements
- metadata
Information on data, networks and experiments
- A-Node
Center for the collection, processing and validation of SMM data and metadata, before sending them on to the national Data Center.
- Epos-France Data Center
Epos-France Data Center is an open data distribution center using international standards
- Facility
An instrumentation facility that generates data and metadata
- Scientist
The responsable scientist for a given campaign dataset.
- Scientific Auditor
The scientist who will validate a given campaign dataset (may be the same as Scientist)
- Technical Auditor
The facility representative who will validate a given campaign dataset
Other terms used in this document :
- Network
A set of associated stations. We use the FDSN Network definition. The same network code may be used by more than 1 Experiment.
- Station
An instrumentation deployed at a specified position for a specified period
- Subnetwork
Subset of an FDSN Network, corresponding to a set of Stations whose data are collected by a single facility during a single data collection Campaign. A Network may have 1 or more Subnetworks.
- Campaign
Subset of Experiment, corresponding to one period of data collection .
- Experiment
Scientific program covering data collection for a given experiement. May have multiple Campaigns and Subnetworks.
- Expedition
A seagoing expedition involved in data collection (deployment, recovery, data collection…). These are sometimes referred to as “campaigns” by operators, but never by the A-node, to avoid confusion with data collection campaigns, which may cover more than one Expedition.
Naming Convention¶
The references of A-Node names and codes are defined at the FDSN source identifiers site and the SEED 2.4 manual. All of these codes must be composed of ASCII Uppercase (A-Z) and/or Numeric [0-9] characters. Station and Location codes may also contain the ASCII Dash (-) character.
Network¶
Network codes contains 1 to 8 characters, but the old standard of 2 characters still dominates and should be used for software compatibility. Using a 2-character code also allows for automatic upgrade to the recommended standard for temporary networks: the two digit code plus the 4-character start year (i.e. 4G2007 for the 4G EMSO-Azores network). Network codes must be requested from the FDSN, more information can be found in the FDSN network site
Station¶
A station code uses to identify a station within a network. Station codes may contain 1 to 8 characters. But 1 to 5 character codes, according to the SEED 2.4 standard, are preferable for the software compatibility. If multiple deployments are made to the same site, one can either use the same station name (if the position does not change significantly compared with respect to expected traveltimes) or the last character of the station name can be incremented with each deployment (e.g., “IF12A”, “IF12B”, “IF12C”, …)
Location¶
Location codes are mostly used distinguish between channels on a single station that have the same channel code, or a station whose position is not the same as its channels. Location codes must not exceed 8 characters (FDSN reference site), but the commonly-used SEED 2.4 standard allows 0 to 2 characters. We recommend using “00” for the station and incrementing 2-digit numbers if other locations need to be specified.
Channel¶
The channel code consists of a sequence of three codes : band, source and subsource (ex. SH1, BDH). More information can be found in the miniseed manual and the reference site for channel code.