Level 1 data (velocity profilers): Difference between revisions
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| colspan="4" | | | colspan="4" style="text-align:center; font-weight:bold; background-color:#f9eddd" | '''Optional variables for 5-beam ADCP'''<math>\dagger</math> | ||
<math>\dagger\ | |- | ||
| RVEL5 | |||
| radial_velocity_of_scatterers_toward_instrument_of_beam_5 | |||
| TIME, R_DIST5 | |||
| Units in m/s | |||
|- | |||
| colspan="4" | <math>\ddagger</math> Quality-control variable names are consistent for those onboard RDI Teleydyne ADCPs. {{FontColor|fg=white|bg=red|text= Not sure for Nortek, perhaps they use the same as their Vectors}} detailed in the [[Level_1_data_(velocity_point-measurements)#Variables|ADV Level 1 variables]]. | |||
<math>\ | <math>\dagger</math> 5-beam ADCPs has the 5th beam usually pointing directly up with its own bin sampling height, and may also be sampled at a different rate. In these situations, the data must be stored in separate variables given the different dimensions assigned. Simply append the number 5 to the variable name (e.g., TIME5) | ||
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Revision as of 20:34, 15 December 2021
| Page status: Draft | |
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| Author(s): | Cynthia |
| Reviewer(s): | |
| Comment: | |
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The required dimensions and variables for the first processing level within NetCDF ATOMIX format for ADCP velocity measurements are described below. This processing level contains the raw measurements recorded by the instrument. If sampling is in burst mode, the measurements from individual bursts are appended together.
Only a few attributes for each variable are listed since the page's purpose is to describe the information layout within each NetCDF file. Please refer to the complete list for the additional attributes related to each variable.
Dimensions
| Short name | Standard name | Dimensions | Comments |
|---|---|---|---|
| TIME | time | TIME | Units in Days since 1950-01-01T00:00:00Z |
| R_DIST | distance_from_sensor_along_beams | R_DIST | along-beam bin centre distance (in meters) from the transducer |
| N_BEAM | unique_identifier_for_each_beam | N_BEAM | Array of 1 to number of beams (4 or 5 typically) |
| Optional dimensions | |||
| R_DIST5 | distance_from_sensor_along_beam_5 | R_DIST5 | along-beam bin centre distance (in meters) from the 5th beam, which is usually aligned with vertical axis of the ADCP. |
Variables
Required variables
| Short name | Standard name | Dimensions | Comments and units |
|---|---|---|---|
| RVEL | radial_velocity_of_scatterers_toward_instrument_in_each_beam | TIME, R_DIST, N_BEAM | Units in m/s |
| THETA | beam_angle_from_instrument_z_axis | TIME, N_BEAM | Units in degrees, positive (usually ~20-30o) |
| BIN_SIZE | instrument_measurement_volume_bin_size | N_BEAM | vertical size of the ADCP bins. Usually the same for all 4 beams, but 5th beam can vary. |
| BURST_NUMBER | unique_identifier_for_each_burst | TIME | Integers of 1, 2, etc to designate which burst the velocities are associated with. Can set all to 1 if continuously sampled. |
| Platform motion variables | |||
| HEADING | platform_yaw_angle | TIME | degrees, clockwise from true North |
| PITCH | platform_pitch_angle | TIME | degrees |
| ROLL | platform_roll_angle | TIME | degrees |
| Quality-control variables usually available with acoustic-Doppler instruments <math>\ddagger</math> | |||
| ABSI | backscatter_intensity_from_each_acoustic_beam | TIME, R_DIST, N_BEAM | db |
| CORR | correlation_magnitude_from_each_acoustic_beam | TIME, R_DIST, N_BEAM | can't remember |
| Optional variables for 5-beam ADCP<math>\dagger</math> | |||
| RVEL5 | radial_velocity_of_scatterers_toward_instrument_of_beam_5 | TIME, R_DIST5 | Units in m/s |
| <math>\ddagger</math> Quality-control variable names are consistent for those onboard RDI Teleydyne ADCPs. Not sure for Nortek, perhaps they use the same as their Vectors detailed in the ADV Level 1 variables.
<math>\dagger</math> 5-beam ADCPs has the 5th beam usually pointing directly up with its own bin sampling height, and may also be sampled at a different rate. In these situations, the data must be stored in separate variables given the different dimensions assigned. Simply append the number 5 to the variable name (e.g., TIME5) } |
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