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C OASTAL D ATA I NFORMATION P ROGRAM 1975 - present. Quality Assurance of Real-Time Data February 2004. Real-Time Web Products. Southern California Summary Map. Nowcast Model Products. 1995: Wave Data Standards Analysis – US Army Corps of Engineers

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c oastal d ata i nformation p rogram 1975 present
COASTALDATAINFORMATIONPROGRAM1975 - present

Quality Assurance of Real-Time Data

February 2004

slide2

Real-Time Web Products

Southern California

Summary Map

Nowcast Model Products

slide3

1995: Wave Data Standards Analysis –

US Army Corps of Engineers

“… provide specifications on the analysis techniques that must be applied to wave data ….to ensure quality and uniformity of the final product. …

The standard has evolved through a consensual approach involving the principal organizations which are responsible for the vast majority of wave measurements for this country. “

2003: Handbook of Automated Data Quality Control Checks and Procedure of the National Data Buoy Center

quality assurance pressure sensor calibration
QUALITY ASSURANCEPressure Sensor Calibration

DEEP TANK

Soak complete package (sensors & cable) –

Establish noise floor

  • COLD BOX
  • Constant Temperature
  • Standard Paros
  • Battery of statistical test of dynamic pressure responses over several weeks to establish noise floor.
slide5

Generated from Aceh,

Indonesia earthquake on

Dec 26, 2005 @ 00:59UTC.

quality control specifications pressure sensors time domain
Quality Control SpecificationsPressure Sensors: Time Domain
  • Max Wave Height Test
  • Flat episodes Test
  • Spike Test
  • Max value Test: successive trough to crest
  • Min Value Test: successive trough to crest
  • Mean Shift Test
  • Equal Peaks Test
  • Acceleration Test
  • Mean crossing Test
  • Period Distribution Test
quality control specifications wave buoys frequency domain
Quality Control SpecificationsWave Buoys: Frequency Domain
  • Check Factors Test – ratio of vertical to horizontal displacement
  • Inclination Test
  • Period exceedence Test

Quality of Telemetery:

  • Discontinuities in transmission
  • Data Corruption
slide8

Central Computer Automated Real-Time Processing

Time Series

Time Domain Quality Control

Frequency Domain

PRODUCTS

NWS/NDBC Transmission

Station Specific Requests

WEB UPDATEReal-Time/Historical

Pub/Non-Public

STORAGE rawspectralparameters

Error/Diagnostic Statistics

Post Processing

Inter-comparison of last

24 hours

1 06 01 07 11 2003 20 19 30 hrs utc code 551 bdd editor f tp out of bounds 33 33

Waimea Buoy, HA – Frequency Domain QC

106: First indicated bad by TP errors > 30s

-106 01 07/11/2003 20:19:30 hrs UTC code=551: (bdd_editor.f) Tp out of bounds: 33.33

Flagged as NON-PUB 7/11/03

BAD – Energy in Low Frequency for all records

slide10

Scripps Canyon NorthWest BuoyFrequency Domain QCCheck factor values 114 0108/16/2003 00:39:30 hrs UTC code=500: (bdd_editor.f) Abnormally high check factors (relationship between vertical and horizontal cross-spectra)

Calibration Test – Bad displacement

Direction & Period erratic. Retrieved buoy and performed calibration tests.

wave data
Wave Data

Torrey Pines Inner –

20m deep

Torrey Pines Outer –

549m deep

Buoys approximately 6 miles apart

dana point buoy ca
Dana Point Buoy, CA

First indicated bad by inclination errors (> 5°)

  • 096 01 09/13/2003 18:59:30 hrs UTC code=702: (buoy_stats.f) Inclination off, arch: 58.52 file: 52.73

GOOD DISPLACEMENT PLOT

BAD – Exagerrated Horizontal Amplitude

modeling waves across the basin
Modeling Waves Across the Basin

Headland shadowing

Refractive

effects

Directional

wave buoy

to initiate

model

Island

shadowing

Diffraction

effects

Amplificationover shoals

cdip in house diagnostics
CDIP In-House Diagnostics
  • Paged:
    • off site (GPS & ARGOS)
    • data is > 1 hr old,
    • computer system is down,
    • computer partitions are > 90% full.
  • Programmers emailed :
    • Offsite
    • Data > 1 hr old, power outages, data

transfer failedSystem messages

cdip diagnostics
CDIP Diagnostics

2004- Data Collection Coverage Percentages

---------------------------------

La Jolla – 99.89%

Torrey Pines O – 95.29%

San Pedro – 95.24

Santa Monica – 99.64%

Pt Dume – 95.88%

Goleta – 97.06%

Harvest – 94.70%

Pt. Reyes – 91.88%

Grays Harbor – 99.31%

Guam – 99.72%

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