Level 1 data (velocity point-measurements)
From Atomix
| Page status: Draft | |
|---|---|
| Author(s): | Cynthia |
| Reviewer(s): | |
| Comment: | |
Dimensions
The number of velocity instruments [N_VEL_INSTRUMENT] is here for completeness, but the benchmarks examples will have measurements only from one instrument stored.
| Short name | Standard name | Dimensions | Comments |
|---|---|---|---|
| TIME | time | time | Units in Days since 1950-01-01T00:00:00Z |
| TIME_HPR | time_of_heading_pitch_roll | TIME_HPR | Heading, pitch and roll (tilt) sensors measure always at 1Hz for Vector ADV |
| N_VEL_COMPONENT | number_of_velocity_component | N_VEL_COMPONENT | Maximum of 3 for u,v, w (east,north, up) velocities |
| N_VEL_INSTRUMENT | number_of_unique_velocity_instruments | N_VEL_INSTRUMENT | Required only if storing multiple synchronized instruments in the same file |
Variables
Required variables
| Short name | Standard name | Dimensions | Comments |
|---|---|---|---|
| ABSIC | backscatter_intensity_from_acoustic_beam | TIME, N_VEL_COMPONENT, N_VEL_INSTRUMENT | |
| CORRN | noise_correlation_percent_from_each_acoustic_beam | TIME, N_VEL_COMPONENT, N_VEL_INSTRUMENT | |
| [math]\displaystyle{ \ddagger }[/math] XYZ_VEL (or ENU_VEL/BEAM_VEL) | TIME, N_VEL_COMPONENT, N_VEL_INSTRUMENT | ||
| [math]\displaystyle{ \dagger }[/math] HEIGHT or DEPTH | TIME, N_VEL_INSTRUMENT | ||
| HEADING | TIME_HPR, N_VEL_INSTRUMENT | ||
| PITCH | TIME_HPR, N_VEL_INSTRUMENT | ||
| ROLL | TIME_HPR, N_VEL_INSTRUMENT | ||
| [math]\displaystyle{ \ddagger }[/math] Some manufacturers record quality-control variables (e.g., CORRN) in the instrument coordinate system. For example, Nortek records these variables in the instrument XYZ frame of reference. It's best to record the data in that coordinate system.
[math]\displaystyle{ \dagger }[/math] A variable situating the instruments in the water column is required. This may be a nominal depth (or height) or a time-varying depth or height above the bottom. | |||
Required height variable
Height or depth-related variables (only 1x is required). These variables locate the instrument vertically from a boundary (e.g, surface or ice). A negative value implies it's below the boundary. Units are always in meters.
| Short name | Standard name | Dimensions |
|---|---|---|
| HEIGHT_AB | height_above_bottom | TIME, N_VEL_INSTRUMENT |
| DEPTH | depth_below_surface | TIME, N_VEL_INSTRUMENT |
Optional variables
| Short name | Standard name | Dimensions |
|---|---|---|
| PRES | TIME, N_VEL_INSTRUMENT | |
| SNR | TIME, N_VEL_COMPONENT | |
| TEMP, and other scalars* | TIME | |
| *Data from concurrent sensors may be optionally included e.g., temperature, dissolved oxygen (e.g., eddy-correlation system) | ||
Group attributes (metadata)
This section describes attributes that may provide additional information about how the data was processed and manipulated at this stage.
Required metadata
- processing_level: This group includes the raw measurements from the recorder, and ancillary measurements required for quality-controlling them using the manufacturer's recommendations.
- Att2
| Attribute name | Suggested content |
|---|---|
| processing_level | Boilerplate comment about the ATOMIX Level 1 content. "This group includes the raw measurements from the recorder and ancillary measurements required for quality-controlling them using the manufacturer's recommendations." |
Optional metadata
- Enter here
