R I T Rochester Institute of Technology

Simultaneous Retrieval of Simultaneous Retrieval of Atmospheric Parameters Atmospheric Parameters and Water Constituent and Water Constituent

Concentrations Concentrations

R I T Rochester Institute of Technology

ApproachesApproaches

• Atmospheric compensation approaches currently a

separate pre-processing step– Model-based Empirical compensation (using HYDROLIGHT)

– Model-base Atmospheric Models (TAFKAA)

• Similar approach implemented and tested by

Chomko, Gordon, Maritorena, Siegel (2003)– Emphasized oceanic conditions

» Assumption of no water upwelling for longer wavelengths

– Garver-Siegel-Maritorena Model of IOPs from SeaBAM data set

» Semi-analytic model

» Optimized for CHL Data < 10 [mg/m^3]

» Lack of particulate backscattering data

R I T Rochester Institute of Technology

Sensor reaching reflectanceSensor reaching reflectance

wsvArt tt

Atmospheric EffectsWater Effects

MODTRAN( visibility, aerosol type)

HYDROLIGHT( CHL, TSS, CDOM)

R I T Rochester Institute of Technology

Suspended SedimentSuspended SedimentHYDROLIGHT simulationsHYDROLIGHT simulations

Hydrolight TSS Only Simulations

00.010.020.030.040.050.060.070.08

700 750 800

Wavelength [nm]

Vo

lum

e S

pec

tral

R

efle

ctan

ce

TSS = 0.0 [g/m 3̂]

TSS=1.0 [g/m 3̂]

TSS=10.0 [g/m 3̂]

TSS=30.0 [g/m 3̂]

LUTs as a function of Aerosol LUTs as a function of Aerosol TypesTypes

…

Types

Number Density

[TSS]

[CDOM][CHL]

R I T Rochester Institute of Technology

RequirementsRequirements

• IOP measurements in the NIR – Appropriately characterize suspended sediments

•Accurate Scattering Phase Functions– Laboratory measurements

– Modeling through scattering codes

R I T Rochester Institute of Technology

Plans for years 4 and 5Plans for years 4 and 5

•Complete Photon Mapping Model and test

against a verification scene

• Implement simultaneous retrieval of

atmospheric parameters and constituent

concentrations– MODTRAN

– HYDROLIGHT

R I T Rochester Institute of Technology

Target PublicationsTarget Publications

•Remote Sensing of Environment

•Applied Optics

• Journal of Great Lakes Research / Journal of

Coastal Research

• Journal of Geophysical Research