IOP Algorithm Workshop OOXIX IOP Algorithm Workshop Ocean

IOP Algorithm Workshop @ OOXIX IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

Fri / Sat workshop generic agenda: 9: 00 start 10: 30 break 12: 30 lunch 13: 30 resume 15: 30 break 17: 30 end 22: 00 group dinner (Fri) IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

focus topics: 1. overview 2. end-user perspectives 3. operational implementation strategies 4. relationships between Rrs and IOPs 5. regional adjustment of SAA parameterization 6. new directions 7. summary, recommendations, & steps forward IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

topic 1 - overview (mod by Jeremy) topics: summarize goals, approaches, evaluation process, & limitations goals: clear understanding of workshop goals agreement on evaluation process & metrics agreement on accuracy of SAA summaries recognition of overlap amongst approaches IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

workshop motivation & goal: achieve community consensus on an effective algorithmic approach for producing global-scale, remotely sensed SAA IOP products what we’re (NASA, anyway) looking for: to do: extend the IOCCG combination of accuracy SAA survey and geographic by coverage (1) evaluating flexible, multi-sensor application implementation of SAA algorithms to satellite radiometry (2) reviewing &efficiency computational consolidating to support SAA construction operational environment open source software and accompanying LUTs associated SAA uncertainties IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

” t u o t o o h s “ m h t i r go al you’ve been warned: IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

topic 1 - overview (mod by Jeremy) topics: summarize goals, approaches, evaluation process, & limitations goals: clear understanding of workshop goals agreement on evaluation process & metrics agreement on accuracy of SAA summaries recognition of overlap amongst approaches IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

process: open com munit y SAA consolidation: identification of (dis)similarities SAA identification: literature review (IOCCG report 5); community solicitation evaluation prep: define metrics; design analyses; identify test data sets software accumulation: standalone versions & l 2 gen (Sea. DAS) import dia log sensitivity studies workshop: consolidate recommendations; ideas “validation” analyses IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

pre-workshop achievements - overview 1. process: a philosophy & a path forward 2. software: l 2 gen (msl 12) & l 3 gen & IDL, Matlab, C, etc. 3. dialog: public record of (forum for) issues & ideas 4. shared analyses (evaluation, sensitivity, etc. ) IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

pre-workshop achievements - dialog & discussion 1. air-sea transmission, Rrs rrs(0 -) 2. calculation of Rrs (bandpass correction, f/Q) 3. temperature & salinity dependence of aw & bbw 4. spectral data products to be considered (adg, bb, etc. ) 5. evaluation metrics & SAA failure conditions 6. inversion methods & linearization issues 7. calculation of uncertainties 8. SAA product validation & sensitivity analyses 9. strategies to produce level-3 products http: //oceancolor. gsfc. nasa. gov/forum/oceancolor/board_show. pl? bid=24 IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

pre-workshop achievements - analyses 1. in situ-to-in situ & satellite-to-in situ match-ups 2. global (level-3) comparisons 3. spatial coverage (level-2) comparisions 4. sensitivities to parameterization & noisy input 5. sensitivity to inversion method 6. level-2 vs. level-3 inversion http: //oceancolor. gsfc. nasa. gov/MEETINGS/OOXIX/IOP/analyses. html IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

available metrics: posted analyses … level-3 flagging … ( for 400 < < 700 ) ( for 400 < < 600 ) Rrs( ) > 0 (? ) adg( ) & a ( ) > -0. 005 -0. 95 aw( ) < a( ) < 5 bbp( ) > -0. 0001 -0. 05 aw( ) < adg( ) < 5 -0. 05 aw( ) < a ( ) < 5 -0. 95 bbw( ) < bb( ) < 0. 015 -0. 05 bbw( ) < bbp( ) < 0. 015 coverage … retrieval quality / comparison … IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

topic 1 - overview (mod by Jeremy) topics: summarize goals, approaches, evaluation process, & limitations goals: clear understanding of workshop goals agreement on evaluation process & metrics agreement on accuracy of SAA summaries recognition of overlap amongst approaches IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

anatomy of a semi-analytical algorithm (SAA): many approaches are similarly constructed & parameterized next, I’ll deconstruct the SAAs to illustrate similarities & differences the goal is to convince you that most SAAs fall within 2 / 3 categories of construction & that most have interchangeable parts IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

satellite provides Rrs( ) and bb ( ) are desired products total a and bb are sums of coefficients for all components in seawater each coefficient expressed as product of magnitude and spectral shape IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

GSM, HL, BR inversion Gordon quad; Lee trans variable S variable a variable system of 5/6 equations with 3 unknowns IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI simultaneous: nonlinear (L-M), matrix inversion

QAA empirical a(555) Gordon quad; Lee trans variable PML, NIWA calculate a iteration a( i, j) estimate adg( i) using S, adg( i, j), and a ( i, j) LUT IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI a = a - aw - adg

LAS calculate Kd LUT solution bb and a both from Kd, bw/b, and solz IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

GSM, HL, BR inversion Gordon quad; Lee trans variable S variable a variable simultaneous: nonlinear (L-M), matrix inversion QAA empirical a(555) Gordon quad; Lee trans variable iteration a( i, j) PML, NIWA calculate a estimate adg( i) using S, adg( i, j), and a ( i, j) LUT LAS calculate Kd LUT solution bb and a both from Kd, bw/b, and solz IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI a = a - aw - adg

bbp(443) agp(443) current state-of -the-art: IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

#2 global deep water algorithm difference adg(555) retrievals � adg(555) difference algorithm #1 IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

topic 1 - overview (mod by Jeremy) topics: summarize goals, approaches, evaluation process, & limitations goals: clear understanding of workshop goals agreement on evaluation process & metrics agreement on accuracy of SAA summaries recognition of overlap amongst approaches IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

QAA (standard) GSM (standard) IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

QAA (standard) GSM (QAA , QAA S, Bricaud a ) IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

QAA (GSM , GSM S) GSM (standard) IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

QAA (GSM , GSM S, GSM a(555)) GSM (standard) IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

topic 2 - end-user perspectives (mod by Mike) topics: desired products & their uses accuracy / behavior uncertainty requirements goals: list(s) near- & long-term needs (with attention to what’s available) list(s) of data product hierarchy / priority IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

topic 3 - operational implementation strategies (mod by Bryan) topics: L 2 Rrs - l 2 gen, f/Q & normalization, bandpass corrections L 3 IOPs - masks, geometry, calc @ L 2 vs L 3, other strategies goals: consensus understanding of L 2 Rrs generation agreeement on SAA flags & their use in L 3 product generation discussion of (dis)advantages of product generation at L 2 vs. L 3 IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

topic 4 - relationships b/w Rrs and IOPs (mod by Emmanuel) topics: IOP shape functions; inversion procedures; uncertainties; ambiguity goals: discussion of sensitivities of shape functions & inversion procedures & how they impact product accuracies & geographic coverage discussion of methods for uncertainty determination IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

topic 5 - regional adjustment of SAA params (mod by Mark/Tim) topics: Dowell/Moore optical water type classification approach; others? goals: consensus (dis)agreement of need to pursue such approaches IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

topic 6 - new directions (mod by Samantha) topics: Glob. Colour; fluorescence; f/Q & normalization(s); others? goals: illumination IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

backup slides IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

questions to be answered: 1. SAAs predefine spectral shapes for the IOP products of interest. What are the key components & can their sensitivities, uncertainties, & relative priority be defined? 2. How critical / sensitive is the optimization or inversion method used? 3. How does spectral resolution effect the retrievals? 4. How do the SAAs perform: a. relative to in situ IOPs using in situ Rrs? 1. b. relative to in situ IOPs using satellite Rrs (from a match-up data set)? 2. c. on various satellite level-2 & level-3 scenes 5. Do the conclusions of #1 -4 vary by trophic level or bioregime? 6. What are the remediations to failure? 7. What is the most appropriate implementation strategy for operational satellite data processing (e. g. , level-2 Rrs normalization, masking & binning at level-3? IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

topic 2 - end-user perspectives (mod by Mike) recommendations: IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

topic 3 - operational implementation strategies (mod by Bryan) recommendations: IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

topic 4 - relationships b/w Rrs and IOPs (mod by Emmanuel) recommendations: IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

topic 5 - regional adjustment of SAA params (mod by Mark/Tim) recommendations: IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

topic 6 - new directions (mod by Samantha) recommendations: IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

(dis)advantages of various modeling approaches: empirical straightforward (Rrs product) & computationally efficient biased to in situ database & degrades with optical complexity SAA / quasi-SAA configurable form & simultaneous output of multiple products only as representative as model assumptions (including empirical functions) LUT based on exact RTE calculations & simultaneous output of products only as representative and flexible as RTE model assumptions IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

attendees: Antoine Mangin (ACRI) Odile Hembise Fanton d’Andon (ACRI) Bryan Franz (NASA) Paula Bontempi (NASA) Catherine Brown (LOV) Samantha Lavender (U. Plymouth) Emmanuel Boss (U. Maine) Sean Bailey (NASA) Gene Feldman (NASA) Stephane Maritorena (UCSB) Hubert Loisel (U. Littoral) Takafumi Hirata (PML) Jeremy Werdell (NASA) Tim Moore (NURC) Jill Schwarz (NIWA) Tim Smyth (PML) Mark Dowell (JRC) Yannick Huot (LOV) Mike Behrenfeld (OSU) Zhong. Ping Lee (MSU) unable to attend: Andre Morel (LOV), Paul Lyon (NRL) IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI

IOP Algorithm Workshop, Ocean Optics XIX, 3 -4 Oct 2008, PJW NASA/SSAI