QARTOD II Currents and Waves

In-Situ Currents:Breakout Group Report Out

QARTOD IIFebruary 28 – March 2, 2005

QARTOD II Currents and Waves

Technology Selection

1. 25 participants2. Three technology groups

1. Current meters2. ADCPs – technology selected by group3. Drifters

3. In general, did not want to be vendor specific

QARTOD II Currents and Waves

Recommended Real-Time Quality Control Tests

Green Level 3

No flag

Pass – data released

Yellow Level 2

Soft flag

Caution – data released

Red Level 1

Hard flag

Fail – data not released

QARTOD II Currents and Waves

Real-Time Quality Control Checks for

Red – Level 1 * Pitch/Roll UVW – Vertical velocity/horizontal velocity Echo amplitude/intensity Percent solutions Percent good pings (PGP) Error velocity Correlation magnitude Surface (or bottom) reflection/ detection

* If information is available with instrument

QARTOD II Currents and Waves

Real-Time Quality Control Checks for

Yellow - Level 2 * Heading Bit status (Built In Test) Battery voltage (V1 & V2) two batteries Water temperature Pressure Timestamp Std deviation of speeds Transmit current Correlation coefficient Speed of sound

* If information is available with instrument

QARTOD II Currents and Waves

Pass SoftFlag Hard Flag

Error Velocity < 15 cm/sec 15-30 cm/sec >30 cm/sec

Percent Good 38: >25%75: >10%

38: 22-25%75: 5-10%

38: <22%75: <5%

Correlation Magnitude (counts)

38: 3 beams > 11075: 3 beams > 64

38: 2 beams > 11075: 2 beams > 64

38: 1 beam >11075: 1 beam > 64

Echo Intensity(After 15th bin)

No adjacent bin differences >20

Adjacent bin differences 20-30

Adjacent bin differences >30

Vertical Velocity(each bin)

Departure from mean <5 cm/sec

Departure from mean 5-10 cm/sec

Departure from mean >10 cm/sec

Horizontal Velocity

<1.25 m/sec 1.25-2.5 m/sec >2.5 m/sec

QARTOD II Currents and Waves

Real-Time Quality Descriptor Flags

Each data record goes out with quality descriptor flagsGroup Discussion Two principle customer groups

Customer interested in observation only (e.g., maritime community) Ensemble flag linked to release of data

Customer interested in full record (e.g., academia, oil and gas industry) Flags for each hard parameter Ensemble flag linked to release of data Flags for soft flags, if affordable

Two data sets Real-time observations (only Level 2 and 3 data) Archived observations (all data)

QARTOD II Currents and Waves

Real-Time Quality Descriptor Flags

Categories … agree with QARTOD I recommendations: -9 = missing value 0 = quality not evaluated 1= bad 2=questionable/suspect 3=good

QARTOD II Currents and Waves

Real-Time Metadata Descriptors

Group DiscussionDeveloped a list of recommended fields to

send with the real-time observation Instrument-level description Metadata should be in the header of the

record

QARTOD II Currents and Waves

Metadata to be Delivered in Real-Time

Latitude (with a designator: fixed or moving) Longitude (with a designator: fixed or moving) Horizontal datum / reference Depth of water Depth of instrument Vertical datum / reference Time (with a designator for time zone, e.g., UTC) Data collected at beginning, middle, or end of sample Compass reference Serial number Units for data reporting Orientation

QARTOD II Currents and Waves

Metadata to be Delivered if Affordable

Sensor type Deployment date Calibration procedures Date of calibration System frequency Bin size Number of bins Sampling interval Bad beam indicator Average interval Pings per ensemble Compass update rate Quality checks descriptions and thresholds Blanking distance Coordinate system for velocity measurements Joyce parameters Platform description, including fixed or moving

QARTOD II Currents and Waves

Real-Time Calibration Flags Descriptors

Place reference to date of calibration in metadata

QARTOD II Currents and Waves

Common Data Formats

Group DiscussionMany data formats represented in groupASCII is universally understoodFuture holds sensor sending data in XMLMoving towards automation and

interoperabilityRecommendationsCommunity should strive to be DMAC compliantRecommended format: NetCDF, along with data

dictionary and convention

QARTOD II Currents and Waves

Next Steps and Roadblocks

Key Next StepsDefine thresholds for quality control testsDevelop open source environment for

collaboration (e.g., TWiki)Define specifications for metadata

descriptorsRoadblocksDisparity in requirements for different user

groups – could lead to two or more datasets