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John Gunn Earth & Space Research. Aquarius Validation Data System Overview and Status Algorithm Workshop March 21-22, 2007. AVDS. Liaison with observers Daily data acquisition Quality control/editing Uniform data format.

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John gunn earth space research

John Gunn

Earth & Space Research

Aquarius Validation Data System Overview and StatusAlgorithm Workshop March 21-22, 2007


Aquarius validation program

AVDS

  • Liaison with observers

  • Daily data acquisition

  • Quality control/editing

  • Uniform data format

Deliver surface calibration data to Aquarius Data Processing Segment (ADPS)

Task Leader:John Gunn

Aquarius Validation Program

TheAquarius Validation Data Segment (AVDS) will collect and process surface measurements for Aquarius data processing


AVDS

ESR

ADPS

GSFC

GTSPP

AVDS/ADPS Interaction

In-situ data

Via ftp

daily

Match up with Aquarius beams for calibration

Validation data

USERS


Avds structure
AVDS Structure

ADPS

(GSFC)

Primary data path

Red implies GSFC

Blue implies ESR

AVDS

Text

files

Satellite

HDF

files

AVDS

Server

(ESR)

In situ

data

Web

interface

Data

Filters

DBMS

Aligned

Data

files

User

requests

Tabulated

files


In situ data filters
In situ data filters

  • Evaluate data for inclusion based on depth, QC flags

  • Duplicate data removed

  • At present, chooses daily data two weeks prior to real-time

  • Time and space selection limits specified (method TBD)

  • Formats data into text file for uploading by ADPS



390 km Orbit Spacing

Search Radius

Buoy Obs.

3 beams, 76 x 94, 84 x 120, 96 x 156 km instantaneous footprint ellipses across the 390 km wide swath.

Match-up Scheme

  • Match-up processing

  • One match-up file per buoy observation contains all the satellite data in the search radius

  • Subsequent processing to generate the optimal weighted average satellite observation per buoy

  • Global tabulations


Match up data processing
Match-up Data Processing

  • Run on ESR data server

  • Uses inputs from AVDS text file and subsequently generated satellite data file (HDF)

  • Process data from each beam and variable separately

  • Perform a weighted average of the pass data centered on the CPA

  • Weighting function shall be Gaussian with e-folding radius half of Aquarius beam width

  • Weighting function to be evaluated through subsequent analysis


Database management system
Database Management System

  • Structured similar to SeaBASS functionality

  • SQL based relational database

  • Search and retrieve capability for in situ, match-up data and originating data by time, geo-location, original platform characteristics and other TBD metadata.

  • Source information for original data may be specified rather than actual data

  • Web-based interface


Avds recent accomplishments
AVDS - Recent Accomplishments

  • Ongoing liaisons with DAC’s

  • Completion of AVDS/ADPS ICD

  • Transfer of real-time ARGO float data to ADPS

  • Recovery of matched up MODIS SST data to AVDS


Avds on going elements
AVDS - On-going Elements

  • Definition of key functional requirements (document in progress)

  • Draft AVDP Plan in preparation


Upcoming tasks
Upcoming Tasks

  • Definition and procurement of RDBMS software

  • Specification of AVDS dedicated data server (disk space requirements, etc.)

  • Web site development


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