Channel metadata

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.

• Required fields (mark with an asterisk, and indicated in the tables below) channel_id* | channel_group_id* | distance_along_fiber* | x_coordinate* | y_coordinate*

• Optional fields elevation_above_sea_level | depth_below_surface | strike | dip

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channel_id

attributeID	channel_id Required
Description	Unique identifier of the individual channel, with a maximum of 8 alphanumeric characters with no special characters (e.g., underscores, period, dash).
Required	True
Type	String
Style	Alphanumeric
Units or options	--
Example	431

channel_group_id

attributeID	channel_group_id Required
Description	Unique identifier of the channel group.
Required	True
Type	String
Style	Alphanumeric
Units or options	--
Example	CG001

distance_along_fiber

attributeID	distance_along_fiber Required
Description	Distance along fiber between the interrogator and channel. Zero meter at the connector to the interrogator; negative distances for fiber section inside the interrogator.
Required	True
Type	Float
Style	na
Units or options	-
Example	na

x_coordinate

attributeID	x_coordinate Required
Description	x-coordinate (UTM-x or longitude) of the channel.
Required	True
Type	Float
Style	na
Units or options	-
Example	328050.69

y_coordinate

attributeID	y_coordinate Required
Description	y-coordinate (UTM-y or latitude) of the channel.
Required	True
Type	Float
Style	na
Units or options	-
Example	4407542.05

elevation_above_sea_level

attributeID	elevation_above_sea_level Optional
Description	Elevation or height above sea level.
Required	False
Type	Float
Style	na
Units or options	-
Example	1231.546

depth_below_surface

attributeID	depth_below_surface Optional
Description	Depth below surface (downwards positive).
Required	False
Type	Float
Style	na
Units or options	-
Example	-

strike

attributeID	strike Optional
Description	Strike of individual channel.
Required	False
Type	Float
Style	na
Units or options	-
Example	-

dip

attributeID	dip Optional
Description	Dip of individual channel.
Required	False
Type	Float
Style	na
Units or options	-
Example	-