# Presentation: 752528

## SeaBASS Data Analyses, 

**SeaBASS Data ****Analyses****, **
**Holdings****, & ****Access Policy**

- SeaWiFS Bio-optical Archive and Storage System
- http://seabass.gsfc.nasa.gov
- Jeremy Werdell
- NASA Ocean Color Discipline Processing Group
- SSAI
- 14 July 2004

## SATELLITE VALIDATION

- JEREMY WERDELL, NASA OCDPG / SSAI, 14 JULY 2004

**SATELLITE VALIDATION**

- The satellite validation & algorithm development systems have been updated.

## SATELLITE VALIDATION

- JEREMY WERDELL, NASA OCDPG / SSAI, 14 JULY 2004

**SATELLITE VALIDATION**

## SATELLITE VALIDATION

- JEREMY WERDELL, NASA OCDPG / SSAI, 14 JULY 2004

- _RECENT ACTIVITIES_
- all Lu() profiles re-evaluated & Lw() estimated
- all Lw() and Rrs() from above-water instruments re-evaluated
- all C*a* profiles re-evaluated & weighted C*a* estimated
- multiple observations reduced to a single observation per station
- 15,000 Lw() observations from 5,000 stations analyzed
- 21,000 C*a* observations from 10,000 stations analyzed
- _SYSTEM HIGHLIGHTS_
- database solution
- coincident *in situ *observations identified
- coincident satellite observations located
- date, time, latitude, & longitude available
- option for additional normalization (e.g., f/Q & self-shading)
- comprehensive *in situ* flagging system
- data type & instrument independent design
- available for validation & algorithm development activities

**SATELLITE VALIDATION**

## SATELLITE VALIDATION

- _EXCLUSION CRITERIA_
- 5 x 5 box, centered on *in situ* observation
- MLAC preferred to GAC
- standard satellite masking
- +/- 3 hour window
- distance from other valid observations
- 50% of non-land pixels valid
- satellite statistical homogeneity

- JEREMY WERDELL, NASA OCDPG / SSAI, 14 JULY 2004

**SATELLITE VALIDATION**

## DATA HOLDINGS

- JEREMY WERDELL, NASA OCDPG / SSAI, 14 JULY 2004

**DATA HOLDINGS**

- With the end of SIMBIOS, data submission rates have dropped significantly.

## DATA HOLDINGS

- JEREMY WERDELL, NASA OCDPG / SSAI, 14 JULY 2004

**DATA HOLDINGS**

## DATA HOLDINGS

- JEREMY WERDELL, NASA OCDPG / SSAI, 14 JULY 2004

**DATA HOLDINGS**

## DATA HOLDINGS

- JEREMY WERDELL, NASA OCDPG / SSAI, 14 JULY 2004

**DATA HOLDINGS**

## DATA HOLDINGS

- JEREMY WERDELL, NASA OCDPG / SSAI, 14 JULY 2004

**DATA HOLDINGS**

## DATA ACCESS POLICY

- JEREMY WERDELL, NASA OCDPG / SSAI, 14 JULY 2004

**DATA ACCESS POLICY**

- With the end of SIMBIOS, the access policy needs formal redefinition.

## DATA ACCESS POLICY

- JEREMY WERDELL, NASA OCDPG / SSAI, 14 JULY 2004

- _CURRENT ACCESS POLICY_
- full access limited to NASA Ocean Color
- Science Team  (e.g., MODIS & SIMBIOS)
- & voluntary data contributors
- data released to public on 3-year
- collection anniversary
- contributor(s) of data extended authorship
- rights until 3-year collection anniversary

- _CONCERNS_
- SIMBIOS-era has ended
- increased need to distribute restricted
- data (e.g., for algorithm development
- activities)
- enforcement of authorship rights
- & acknowledgements
- _POSSIBLE UPDATES_
- continue existing policy
- reduce data release to 1-year or
- 18-month collection anniversary
- adopt *SeaWiFS authorized user*
- -like approach

**DATA ACCESS POLICY**

## RESOURCES

**RESOURCES**

- JEREMY WERDELL, NASA OCDPG / SSAI, 14 JULY 2004

- MAIN:		http://seabass.gsfc.nasa.gov
- DATA:		http://seabass.gsfc.nasa.gov/dataordering.html
- CALIBRATION:	http://seabass.gsfc.nasa.gov/vicarious_splash.cgi
- VALIDATION:	http://seabass.gsfc.nasa.gov/matchup_results.html
- CONTACT:		seabass@seabass.gsfc.nasa.gov