Transcript Schedule - Carolinas RCOOS

IN-SITU WAVE GROUP
Kent Hathaway, Moderator
QARTOD II
February 28 – March 2, 2005
QARTOD II
Currents and Waves
Sensor selection
Datawell buoy QC chosen as example of a process
to establish a QA/QC recipe
Our group will compile recipes for other sensors
prior to QARTOD II publication
QARTOD II
Currents and Waves
What is a Datawell buoy?
 Spherical
 Directional
 Mooring – connected by bungee cord.
 Surface following, with vertical accelerometer,
compass, pitch and roll sensors
 Vertical motion not susceptible to the pitch
 No limitation on depth
 Sophisticated processing inside
 Protective triangle- protects from spinning during ship collisions.
QARTOD II
Currents and Waves
1. What real-time quality control tests
should be applied?
Datawell transmits both an XYZ file and a spectral file
Frequency domain:
 Check Factors Test – ratio of vertical to horizontal displacement
 Inclination Test
 Period exceedence Test
 Threshold Test- Hs, Tp, Dp, (SNR, Hrms, Tm, Dm)
Time Domain:
 Spikes, flat episodes, range, consecutive values, acceleration, mean test
Quality of Telemetery:
 Discontinuities in transmission
 Data Corruption - CRC
QARTOD II
Currents and Waves
2. What categories of real-time quality
descriptor flags should be required?
Datawell uses own flag system, but these can be mapped to
agree with QARTOD I system
-9= missing
0= quality not evaluated
1= bad
2=questionable/suspect
3= passed real-time QA/QC (as opposed to GOOD)
Distinction should be made between real-time flags and
post-processing flags
Flags should be defined in metadata
QARTOD II
Currents and Waves
3. What real-time metadata descriptors
should be included?
Providers should stay attuned to the
IOOS/DMAC evolution
Providers should work towards making headers
available in FGDC compliant format on request
Examples of datawell headers are listed on pages
58-61 of QARTOD I Report
Will work with metadata initiative group to define
header parameters.
QARTOD II
Currents and Waves
4. What real-time calibration flags
should be required?
Buoy is calibrated at manufacturer prior to purchase. Data
provider should include calibration date and method, as defined
by manufacturer, in metadata.
Pre-deployment verification (prior to each deployment):
bounce
compass
inclination
electronic checks
In situ verification (parameters returned with each data
stream):
check factor
QARTOD II
inclination
Currents and Waves
5. What common data formats should
be required?
Datawell output permits mapping to any desired
data format:
ASCII or binary
NetCDF
compressed
FM-13 and FM-65
others
QARTOD II
Currents and Waves
6. Additional requirements associated
with DMAC?
Data providers should:
keep apprised of DMAC evolution
prepare to deliver dynamic data service based upon
further specifications by DMAC
provide guidance to DMAC regarding transport
protocols and formats for data transfer???
QARTOD II
Currents and Waves
7. Describe key next steps and current
roadblocks to developing and implementing
an operational QA/QC capability.
Roadblocks
Lack of specifics in DMAC
Capacity for verification procedures among certain
users
Developing QA/QC capability takes time and
experience
Need standardization of XML tags
Data transport between regional organizations
QARTOD II
Currents and Waves
Next steps
Undergo same exercise for other wave sensors such
as pressure gauges, buoys, ADCPs, radar, HF
Email draft “recipe” and list of metadata
parameters to rest of group to get feedback
Assemble matrix using this feedback
QARTOD II
Currents and Waves
Questions?
QARTOD II
Currents and Waves