Schema

Terms and Definitions

The metadata fully describes the five key components of a DAS data collection system: (1) interrogator, (2) data acquisition, (3) channels, (4) cable, and (5) fiber. The metadata schema is hierarchical based, with a parent overview metadata block describing the experiment, and two main child branches describing the instrument (i.e., interrogator, photonics setup, acquisition parameters) and the sensor locations (i.e., cable installation and fiber properties). The simplest example is one fiber within one cable connected to one interrogator. The suggested metadata structure allows for much more complex installations with multiple fibers, cables, and interrogators deployed with different acquisition parameters. The metadata schema is designed to be independent of the time-series data so that corrections and updates can be applied to the metadata, without having to manipulate large volumes of time-series data.

Each metadata block consists of required and optional attributes. Required metadata is information that is considered essential to enable re-use of the data. This information makes the data self-describing and no further information required from the provider to work with the data. Optional metadata is information that could be useful in interpreting the measured signal but is not essential.

Structure

The proposed metadata is divided into six major blocks: overview, interrogator, acquisition, channel group (and individual channel), cable, and fiber.

Overview metadata

The Overview metadata gives a high-level overview of the DAS deployment and describes the geographic location of the installation, dates of the project, and information on the data provider.

Type: object

Overview metadata
Property	Type	Required	Description
version	None	Required	Metadata schema version
network_code	string	Required	Unique FDSN network code for the More
location	string	Required	Name of the geographic location More
country	string	Required	Country where the installation i More
principal_investigator	array	Required	Principal investigator(s) for th More
point_of_contact	string	Required	Point of contact for the metadat More
point_of_contact_email	string	Required	Email address of point of contac More
point_of_contact_address	string	Required	Physical address and institution More
start_date	string	Required	Start date of data collection at More
end_date	string	Required	End date of data collection at t More
funding_agency	string	Required	Name(s) of agency that funded th More
project_number	string	Required	Funding project number
digital_object_identifier	string	Required	Digital object identifier (DOI) More
purpose_of_data_collection	string	Required	Brief explanation of the purpose More
comment	string	Required	Additional comments
interrogators	array	Required	Interrogators
cables	array	Required	Cables

version

Metadata schema version. This identifies which version of the metadata schema that this document conforms to.

Type:: None
Required:: Required
Possible Values:: 2.0

network_code

Unique FDSN network code for the installation, following FDSN Source Identifier specification

Type:: string
Required:: Required
Possible Values:: ^[A-Z0-9]+$
Examples:: "3U2023"

location

Name of the geographic location of the installation.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "Brady's Hot Springs, Nevada"

country

Country where the installation is located. Use ISO 3166-1 alpha-3 three-letter country code.

Type:: string
Required:: Required
Possible Values:: Length: 3 <= string <= 3
Examples:: "USA"

principal_investigator

Principal investigator(s) for the installation.

Type:: array
Required:: Required
Possible Values:: principal_investigator_fields

point_of_contact

Point of contact for the metadata.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "Dr. Jean Grey"

point_of_contact_email

Email address of point of contact.

Type:: string
Required:: Required
Possible Values:: Format: email
Examples:: "jean.gray@xavier-institute.com"

point_of_contact_address

Physical address and institution of point of contact.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "University of Wisconsin"

start_date

Start date of data collection at the installation in Coordinated Universal Time (UTC).

Type:: string
Required:: Required
Possible Values:: Format: date
Examples:: "2016-03-11"

end_date

End date of data collection at the installation in UTC. If the installation end date is unknown this field should be omitted and updated when it is known.

Type:: string
Required:: Required
Possible Values:: Format: date
Examples:: "2016-03-26"

funding_agency

Name(s) of agency that funded the experiment.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "U.S. DOE Geothermal Technology Office"

project_number

Funding project number. Should be supplied if a number has been assigned by funding agency(s).

Type:: string
Required:: Required
Possible Values:: string
Examples:: "DOE CN: EE0006760"

digital_object_identifier

Digital object identifier (DOI) that uniquely identifies the metadata; this identifier may only become available following archiving.

Type:: string
Required:: Required
Possible Values:: Format: uri
Examples:: "https://doi.org/10.15121/1778858", "doi:10.5880/GFZ.2.2.2023.001"

purpose_of_data_collection

Brief explanation of the purpose of experiment.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "Monitor geothermal field"

comment

Additional comments.

Type:: string
Required:: Required
Possible Values:: string

interrogators

Interrogators. Multiple interrogators can be documented.

Type:: array
Required:: Required
Possible Values:: interrogator

cables

Cables. Multiple cables can be documented.

Type:: array
Required:: Required
Possible Values:: cable

Principal investigator metadata

The Principal Investigator metadata contains information about the principal investigator for the installation.

Type: object

Principal investigator metadata
Property	Type	Required	Description
name	string	Required	Name of principal investigator f More
email	string	Required	Email address of principal inves More
address	string	Required	Physical address and institution More

principal_investigator_fields > name

Name of principal investigator for the installation.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "Professor Xavier"

principal_investigator_fields > email

Email address of principal investigator.

Type:: string
Required:: Required
Possible Values:: Format: email
Examples:: "professorx@xavier-institute.com"

principal_investigator_fields > address

Physical address and institution of principal investigator.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "University of Wisconsin"

Interrogator metadata

The Interrogator metadata contains information about the interrogator unit used for the data collection. More than one interrogator may be operating during an experiment, therefore each unit is given a unique identifier and described in individual Interrogator metadata blocks.

Type: object

Interrogator metadata
Property	Type	Required	Description
interrogator_id	string	Required	Unique identifier of the interro More
manufacturer	string	Required	Manufacturer name of the interro More
model	string	Required	Model number of the interrogator
serial_number	string	Required	Serial number of the interrogato More
firmware_version	string	Required	Firmware version of the software More
comment	string	Required	Additional comments
acquisitions	array	Required	Acquisitions

interrogator > interrogator_id

Unique identifier of the interrogator unit used in the experiment, assigned by data provider. Identifier should have the maximum of eight alphanumeric characters with no special characters (e.g., underscores, period, and dash).

Type:: string
Required:: Required
Possible Values:: dasid
Examples:: "IU001"

interrogator > manufacturer

Manufacturer name of the interrogator.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "Silixa"

interrogator > model

Model number of the interrogator.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "iDAS"

interrogator > serial_number

Serial number of the interrogator.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "12345"

interrogator > firmware_version

Firmware version of the software used within the interrogator.

Type:: string
Required:: Required
Possible Values:: string

interrogator > comment

Additional comments.

Type:: string
Required:: Required
Possible Values:: string

interrogator > acquisitions

One or more acquisitions with this interrogator.

Type:: array
Required:: Required
Possible Values:: acquisition

Acquisition metadata

The Acquisition metadata describes the acquisition parameters set by the user on a particular interrogator. While different interrogator vendors may implement various photonics design and algorithms which are not easily translatable across interrogators, the Acquisition metadata intends to capture the critical acquisition attributes that are commonly required to analyze and interpret the output time series or matrices. These attributes are carefully defined to be standardized across all interrogator systems.

Type: object

Acquisition metadata
Property	Type	Required	Description
acquisition_id	string	Required	Unique identifier of the data ac More
acquisition_start_time	string	Required	Start time of this data acquisit More
acquisition_end_time	string	Required	End time of this data acquisitio More
acquisition_sample_rate	number	Required	The rate at which the interrogat More
acquisition_sample_rate_unit	string	Required	Unit of acquisition sample rate
gauge_length	number	Required	The averaging length along the f More
gauge_length_unit	string	Required	Unit of gauge length
unit_of_measure	None	Required	Unit of measure of archived data More
number_of_channels	integer	Required	The total number of sampling poi More
spatial_sampling_interval	number	Required	The channel spacing, or offset, More
spatial_sampling_interval_units	string	Required	Unit of spatial sampling interva More
pulse_rate	number	Required	Rate at which the interrogator u More
pulse_rate_unit	string	Required	Unit of pulse rate
pulse_width	number	Required	Width of the pulse sent down the More
pulse_width_unit	string	Required	Unit of pulse width
comment	string	Required	Additional comments
native_headers	object	Required	Native headers
channel_groups	array	Required	Channel groups

acquisition > acquisition_id

Unique identifier of the data acquisition, assigned by data provider. Identifier should have the maximum of eight alphanumeric characters with no special characters (e.g., underscores, period, and dash). One identifier per acquisition settings.

Type:: string
Required:: Required
Possible Values:: dasid
Examples:: "A001"

acquisition > acquisition_start_time

Start time of this data acquisition in Coordinated Universal Time (UTC).

Type:: string
Required:: Required
Possible Values:: Format: date-time
Examples:: "2016-03-11T16:46:18.000Z"

acquisition > acquisition_end_time

End time of this data acquisition in UTC. If data acquisition is still in operation, use a date the future (e.g., 2999-01-01 00:00:00.000Z).

Type:: string
Required:: Required
Possible Values:: Format: date-time
Examples:: "2016-03-26T01:01:15.000Z"

acquisition > acquisition_sample_rate

The rate at which the interrogator provides output data.

Type:: number
Required:: Required
Possible Values:: 0 < x
Examples:: 1000

acquisition > acquisition_sample_rate_unit

Unit of acquisition sample rate.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "Hertz"

acquisition > gauge_length

The averaging length along the fiber for a measurement, determined at experiment setup and used during acquisition.

Type:: number
Required:: Required
Possible Values:: 0 < x
Examples:: 10

acquisition > gauge_length_unit

Unit of gauge length.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "meter"

acquisition > unit_of_measure

Unit of measure of archived data set. This may be the same unit as the Interrogator unit measure if the data are raw.

Type:: None
Required:: Required
Possible Values:: count strain strain-rate velocity
Examples:: "count"

acquisition > number_of_channels

The total number of sampling points along the fiber as output from the interrogator, referred to as NumberOfLoci in PRODML.

Type:: integer
Required:: Required
Possible Values:: 1 <= x
Examples:: 8720

acquisition > spatial_sampling_interval

The channel spacing, or offset, between channels.

Type:: number
Required:: Required
Possible Values:: 0 < x
Examples:: 1.0

acquisition > spatial_sampling_interval_units

Unit of spatial sampling interval.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "meter"

acquisition > pulse_rate

Rate at which the interrogator unit interrogates the fiber sensor.

Type:: number
Required:: Required
Possible Values:: 0 <= x
Examples:: 1000

acquisition > pulse_rate_unit

Unit of pulse rate.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "Hertz"

acquisition > pulse_width

Width of the pulse sent down the fiber in unit of time.

Type:: number
Required:: Required
Possible Values:: 0 <= x

acquisition > pulse_width_unit

Unit of pulse width.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "nanoseconds"

acquisition > comment

Additional comments.

Type:: string
Required:: Required
Possible Values:: string

acquisition > native_headers

Native headers from the interrogator for this acquisition as a key-value list.

Type:: object
Required:: Required
Possible Values:: object
Examples:: {"header1": "Value of header1", "header2": "Value of header2", "header3": 99.4}

acquisition > channel_groups

One or more channel groups for this acquisition.

Type:: array
Required:: Required
Possible Values:: channel_group

Channel group metadata

The Channel Group metadata describes the properties that are common to all the channels nested under the Interrogator and Acquisition metadata blocks. Having a group-level metadata removes the repetition of common attributes in the individual Channel metadata. This design allows multiple channel groups to exist under the same interrogator and data acquisition settings. The unique identifiers for the interrogator, acquisition, cable and fiber are recorded as well in this metadata block to allows mapping between the interrogator, acquisition, and fiber that were used for this set of coordinates during a particular data collection.

Type: object

Channel group metadata
Property	Type	Required	Description
channel_group_id	string	Required	Unique identifier of the channel More
cable_id	string	Required	Unique identifier of cable linke More
fiber_id	string	Required	Unique identifier of fiber linke More
coordinate_generation_date	string	Required	Date that the channel coordinate More
coordinate_system	None	Required	Coordinate system used in channe More
reference_frame	string	Required	Geodetic datum and/or grid zone More
location_method	string	Required	Method used to determine the coo More
distance_along_fiber_unit	string	Required	Unit of distance along fiber
x_coordinate_unit	string	Required	Unit of x-coordinate (UTM-x or l More
uncertainty_in_x_coordinate	number	Required	Uncertainty in the x-coordinate More
uncertainty_in_x_coordinate_unit	string	Required	Unit of uncertainty in x-coordin More
y_coordinate_unit	string	Required	Unit of y-coordinate (UTM-y or l More
uncertainty_in_y_coordinate	number	Required	Uncertainty in the y-coordinate More
uncertainty_in_y_coordinate_unit	string	Required	Unit of uncertainty in y-coordin More
elevation_above_sea_level_unit	string	Required	Unit of elevation above sea leve More
uncertainty_in_elevation	number	Required	Uncertainty in elevation above s More
uncertainty_in_elevation_unit	string	Required	Unit of uncertainty in elevation
depth_below_surface_unit	string	Required	Unit of depth below surface
uncertainty_in_depth	number	Required	Uncertainty in depth below surfa More
uncertainty_in_depth_unit	string	Required	Unit of uncertainty in depth
strike_unit	string	Required	Unit of strike
uncertainty_in_strike	number	Required	Uncertainty in the strike
uncertainty_in_strike_unit	string	Required	Unit of uncertainty in strike
dip_unit	string	Required	Unit of dip
uncertainty_in_dip	number	Required	Uncertainty in the dip
uncertainty_in_dip_unit	string	Required	Unit of uncertainty in dip
first_usable_channel_id	string	Required	The first channel considered phy More
last_usable_channel_id	string	Required	The last channel considered phys More
comment	string	Required	Additional comments
channels	array	Required	Channels

channel_group > channel_group_id

Unique identifier of the channel group. Identifier should have the maximum of eight alphanumeric characters with no special characters (e.g., underscores, period, and dash).

Type:: string
Required:: Required
Possible Values:: dasid
Examples:: "CG001"

channel_group > cable_id

Unique identifier of cable linked to this channel group.

Type:: string
Required:: Required
Possible Values:: dasid
Examples:: "CA001"

channel_group > fiber_id

Unique identifier of fiber linked to this channel group. The fiber_id must nest within specified cable_id.

Type:: string
Required:: Required
Possible Values:: dasid
Examples:: "F001"

channel_group > coordinate_generation_date

Date that the channel coordinates were generated.

Type:: string
Required:: Required
Possible Values:: Format: date
Examples:: "2016-07-01"

channel_group > coordinate_system

Coordinate system used in channel location. Select geographic for coordinates in latitude and longitude. Universal Transverse Mercator (UTM) is the preferred projected coordinate system.

Type:: None
Required:: Required
Possible Values:: geographic UTM local
Examples:: "UTM"

channel_group > reference_frame

Geodetic datum and/or grid zone number in UTM.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "UTM Zone 11N", "WGS84"

channel_group > location_method

Method used to determine the coordinates of each channel. Example: tap test, GPS tracker.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "tap test"

channel_group > distance_along_fiber_unit

Unit of distance along fiber.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "meter"

channel_group > x_coordinate_unit

Unit of x-coordinate (UTM-x or longitude). Applies to every individual channel nested under the channel group.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "degree"

channel_group > uncertainty_in_x_coordinate

Uncertainty in the x-coordinate (UTM-x or longitude) representing the average uncertainty for all the channels.

Type:: number
Required:: Required
Possible Values:: 0 <= x

channel_group > uncertainty_in_x_coordinate_unit

Unit of uncertainty in x-coordinate.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "meter"

channel_group > y_coordinate_unit

Unit of y-coordinate (UTM-y or latitude). Applies to every individual channel nested under the channel group.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "degree"

channel_group > uncertainty_in_y_coordinate

Uncertainty in the y-coordinate (UTM-y or latitude) representing the average uncertainty for all the channels.

Type:: number
Required:: Required
Possible Values:: 0 <= x

channel_group > uncertainty_in_y_coordinate_unit

Unit of uncertainty in y-coordinate.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "meter"

channel_group > elevation_above_sea_level_unit

Unit of elevation above sea level. Applies to every individual channel nested under the channel group.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "meter"

channel_group > uncertainty_in_elevation

Uncertainty in elevation above sea level, representing the average uncertainty in elevation for all the coordinates.

Type:: number
Required:: Required
Possible Values:: 0 <= x

channel_group > uncertainty_in_elevation_unit

Unit of uncertainty in elevation.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "meter"

channel_group > depth_below_surface_unit

Unit of depth below surface. Applies to every individual channel nested under the channel group.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "meter"

channel_group > uncertainty_in_depth

Uncertainty in depth below surface, representing the average uncertainty in depth for all the coordinates.

Type:: number
Required:: Required
Possible Values:: 0 <= x

channel_group > uncertainty_in_depth_unit

Unit of uncertainty in depth.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "meter"

channel_group > strike_unit

Unit of strike. Applies to every individual channel nested under the channel group.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "degree"

channel_group > uncertainty_in_strike

Uncertainty in the strike.

Type:: number
Required:: Required
Possible Values:: 0 <= x

channel_group > uncertainty_in_strike_unit

Unit of uncertainty in strike.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "degree"

channel_group > dip_unit

Unit of dip. Applies to every individual channel nested under the channel group.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "degree"

channel_group > uncertainty_in_dip

Uncertainty in the dip.

Type:: number
Required:: Required
Possible Values:: 0 <= x

channel_group > uncertainty_in_dip_unit

Unit of uncertainty in dip.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "degree"

channel_group > first_usable_channel_id

The first channel considered physically meaningful. Typically, this will be a few channels after the last channel inside the interrogator. Must match one of the channel IDs.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "30"

channel_group > last_usable_channel_id

The last channel considered physically meaningful. Typically, an acquisition will add virtual channels at the end of the fiber or the optical path might not reach the end of the fiber, and this can be used to cut the data set into a working set. Must match one of the channel IDs.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "8650"

channel_group > comment

Additional comments.

Type:: string
Required:: Required
Possible Values:: string

channel_group > channels

One or more channels for this channel group.

Type:: array
Required:: Required
Possible Values:: channel

Channel metadata

Nested under the Channel Group metadata, the individual Channel metadata consists of properties that are unique to each channel, including a unique identifier, coordinates, and for borehole cable, optional strike and dip. Note that the total amount of individual Channel metadata may be equal or less than the number_of_channels attribute specified under Acquisition metadata as only a subset of the channels may be included in the data. This is to accommodate cases where channels cannot be located or omitted due to various reasons.

Type: object

Channel metadata
Property	Type	Required	Description
channel_id	string	Required	Unique identifier of the individ More
distance_along_fiber	number	Required	Distance along fiber between the More
x_coordinate	number	Required	x-coordinate (UTM-x or longitude More
y_coordinate	number	Required	y-coordinate (UTM-y or latitude) More
elevation_above_sea_level	number	Required	Elevation or height above sea le More
depth_below_surface	number	Required	Depth below surface (downward po More
strike	number	Required	Strike of individual channel
dip	number	Required	Dip of individual channel

channel > channel_id

Unique identifier of the individual channel, with the maximum of eight alphanumeric characters with no special characters (e.g., underscores, period, and dash).

Type:: string
Required:: Required
Possible Values:: dasid
Examples:: "431"

channel > distance_along_fiber

Distance along fiber between the interrogator and channel. Zero meter at the connector to the interrogator; and negative distances for fiber section inside the interrogator.

Type:: number
Required:: Required
Possible Values:: number

channel > x_coordinate

x-coordinate (UTM-x or longitude) of the channel.

Type:: number
Required:: Required
Possible Values:: number
Examples:: 328050.69

channel > y_coordinate

y-coordinate (UTM-y or latitude) of the channel.

Type:: number
Required:: Required
Possible Values:: number
Examples:: 4407542.05

channel > elevation_above_sea_level

Elevation or height above sea level.

Type:: number
Required:: Required
Possible Values:: number
Examples:: 1231.546

channel > depth_below_surface

Depth below surface (downward positive).

Type:: number
Required:: Required
Possible Values:: number

channel > strike

Strike of individual channel.

Type:: number
Required:: Required
Possible Values:: number

channel > dip

Dip of individual channel.

Type:: number
Required:: Required
Possible Values:: number

Cable metadata

The Cable metadata is designed to allow investigators to describe the cable used in their experiment, which could be one continuous long cable, or cables with multiple connectors or across several installation environments. There are also parameters relating to the general geographical location of the cable to facilitate searchability in future databases. The Cable metadata should include available information on the cable and its installation as this knowledge may help in developing a system-level description of the exact cable response.

Type: object

Cable metadata
Property	Type	Required	Description
cable_id	string	Required	Unique identifier for the specif More
cable_bounding_box	array	Required	List of approximate coordinates More
cable_owner	string	Required	Proprietary owner of the cable
cable_installation_date	string	Required	Cable installation date in Coord More
cable_removal_date	string	Required	Cable removal date in UTC
cable_characteristics	string	Required	Describes how the fiber is encas More
cable_environment	string	Required	Describes the installation envir More
cable_installation_environment	string	Required	Plain language description of ho More
cable_model	string	Required	Cable manufacturer model
cable_outside_diameter	number	Required	Cable outside diameter
cable_outside_diameter_unit	string	Required	Unit of outside diameter of cabl More
comment	string	Required	Additional comments
fibers	array	Required	Fibers

cable > cable_id

Unique identifier for the specific physical cable used in the data acquisition. Identifier should have the maximum of eight alphanumeric characters with no special characters (e.g., underscores, period, and dash).

Type:: string
Required:: Required
Possible Values:: dasid
Examples:: "CA001"

cable > cable_bounding_box

List of approximate coordinates of the bounding box containing the array [minimum latitude, maximum latitude, minimum longitude, and maximum longitude].

Type:: array
Required:: Required
Possible Values:: number
Examples:: [39.797, 39.813, -119.013, -118.995]

cable > cable_owner

Proprietary owner of the cable.

Type:: string
Required:: Required
Possible Values:: string

cable > cable_installation_date

Cable installation date in Coordinated Universal Time (UTC). This may not be known, an optional field.

Type:: string
Required:: Required
Possible Values:: Format: date

cable > cable_removal_date

Cable removal date in UTC. This may not be known, an optional field.

Type:: string
Required:: Required
Possible Values:: Format: date

cable > cable_characteristics

Describes how the fiber is encased in the cable.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "buffered", "armored", "gel-filled"

cable > cable_environment

Describes the installation environment of cable [conduit| trench | outside borehole casing | wireline | other ].

Type:: string
Required:: Required
Possible Values:: string
Examples:: "trench", "conduit"

cable > cable_installation_environment

Plain language description of how the cable was installed.

Type:: string
Required:: Required
Possible Values:: string

cable > cable_model

Cable manufacturer model.

Type:: string
Required:: Required
Possible Values:: string

cable > cable_outside_diameter

Cable outside diameter.

Type:: number
Required:: Required
Possible Values:: 0 < x

cable > cable_outside_diameter_unit

Unit of outside diameter of cable.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "millimeter"

cable > comment

Additional comments.

Type:: string
Required:: Required
Possible Values:: string

cable > fibers

One or more Fibers for this cable

Type:: array
Required:: Required
Possible Values:: fiber

Fiber metadata

The intention for a separate Fiber metadata is to uniquely identify the fiber used to make the measurements. More than one cable may be used over the course of an experiment and there may be several fibers within a cable.

Type: object

Fiber metadata
Property	Type	Required	Description
fiber_id	string	Required	Unique identifier for the physic More
fiber_geometry	string	Required	Geometry of fiber [linear \| heli More
fiber_mode	string	Required	Mode of fiber [single-mode \| mul More
fiber_refraction_index	number	Required	Refractive index of the fiber (u More
fiber_winding_angle	number	Required	If helical, this is the winding More
fiber_winding_angle_unit	string	Required	Unit of fiber winding angle
fiber_start_location	number	Required	The start distance along the fib More
fiber_start_location_unit	string	Required	Unit of fiber start location
fiber_end_location	number	Required	The end location or distance alo More
fiber_end_location_unit	string	Required	Unit of fiber end location
fiber_optic_length	number	Required	Total length of this fiber
fiber_optic_length_unit	string	Required	Unit of fiber-optical length
fiber_one_way_attenuation	number	Required	Power loss for one-way travel of More
fiber_one_way_attenuation_unit	string	Required	Unit of fiber one way attenuatio More
comment	string	Required	Additional comments

fiber > fiber_id

Unique identifier for the physical fiber, with the maximum of eight alphanumeric characters with no special characters (e.g., underscores, period, and dash).

Type:: string
Required:: Required
Possible Values:: dasid
Examples:: "F001"

fiber > fiber_geometry

Geometry of fiber [linear | helical | other].

Type:: string
Required:: Required
Possible Values:: string
Examples:: "linear", "helical"

fiber > fiber_mode

Mode of fiber [single-mode | multi-mode | other].

Type:: string
Required:: Required
Possible Values:: string
Examples:: "single-mode", "multi-mode"

fiber > fiber_refraction_index

Refractive index of the fiber (unitless). Typical value for single-mode fiber is 1.4681.

Type:: number
Required:: Required
Possible Values:: 0 <= x
Examples:: 1.4681

fiber > fiber_winding_angle

If helical, this is the winding angle relative to the center of the cable.

Type:: number
Required:: Required
Possible Values:: number

fiber > fiber_winding_angle_unit

Unit of fiber winding angle.

Type:: string
Required:: Required
Possible Values:: string

fiber > fiber_start_location

The start distance along the fiber with respect to the interrogator, referred to as StartLocus in PRODML.

Type:: number
Required:: Required
Possible Values:: number

fiber > fiber_start_location_unit

Unit of fiber start location.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "meter"

fiber > fiber_end_location

The end location or distance along the fiber with respect to the interrogator.

Type:: number
Required:: Required
Possible Values:: number

fiber > fiber_end_location_unit

Unit of fiber end location.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "meter"

fiber > fiber_optic_length

Total length of this fiber. Typically, it is the sum of fiber_start_location and fiber_end_location.

Type:: number
Required:: Required
Possible Values:: 0 < x
Examples:: 8400

fiber > fiber_optic_length_unit

Unit of fiber-optical length.

Type:: string
Required:: Required
Possible Values:: string
Examples:: "meter"

fiber > fiber_one_way_attenuation

Power loss for one-way travel of a beam of light. Typical value for single mode fiber is 0.4.

Type:: number
Required:: Required
Possible Values:: 0 < x

fiber > fiber_one_way_attenuation_unit

Unit of fiber one way attenuation [decibels/meter | decibels/kilometer].

Type:: string
Required:: Required
Possible Values:: string
Examples:: "decibels/meter"

fiber > comment

Additional comments.

Type:: string
Required:: Required
Possible Values:: string

dasid

No description provided for this model.

Type: string