Channel Metadata
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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.
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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
| 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 |
| attributeID | channel_group_id Required |
|---|---|
| Description | Unique identifier of the channel group. |
| Required | True |
| Type | String |
| Style | Alphanumeric |
| Units or options | -- |
| Example | CG001 |
| 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 |
| 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 |
| 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 |
| 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 |
| attributeID | depth_below_surface Optional |
|---|---|
| Description | Depth below surface (downwards positive). |
| Required | False |
| Type | Float |
| Style | na |
| Units or options | - |
| Example | - |
| attributeID | strike Optional |
|---|---|
| Description | Strike of individual channel. |
| Required | False |
| Type | Float |
| Style | na |
| Units or options | - |
| Example | - |
| attributeID | dip Optional |
|---|---|
| Description | Dip of individual channel. |
| Required | False |
| Type | Float |
| Style | na |
| Units or options | - |
| Example | - |