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Application of MODIS land/atmosphere bands to ocean processing. NASA Ocean Biology Processing Group Goddard Space Flight Center, Greenbelt, Maryland, USA SeaDAS Training Material. band wavelength resolution potential use 645 nm 250 m sediments, turbidity, IOPs 859 250 aerosols

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slide1

Application of MODIS land/atmosphere bands to ocean processing

NASA Ocean Biology Processing Group

Goddard Space Flight Center, Greenbelt, Maryland, USA

SeaDAS Training Material

SeaDAS Training ~ NASA Ocean Biology Processing Group

slide2

band wavelength resolution potential use

    • 645 nm 250 m sediments, turbidity, IOPs
    • 859 250 aerosols
    • 469 500 Ca, IOPs, CaCO3
    • 555 500 Ca, IOPs, CaCO3
    • 1240 500 aerosols
    • 1640 500 aerosols
    • 2130 500 aerosols

MODIS land / atmosphere bands

SeaDAS Training ~ NASA Ocean Biology Processing Group

slide3

Expanded MODIS ocean band suite

increased spatial resolution and expanded dynamic range have cost of

increased digitization error and reduced signal to noise

SeaDAS Training ~ NASA Ocean Biology Processing Group

slide4

Multi-resolution implementation

aggregation

interpolation

from Gumley et al.

observed (TOA) radiances, geolocation, radiant path geometries interpolated or aggregated to a common resolution at start

SeaDAS Training ~ NASA Ocean Biology Processing Group

slide5

Nanticoke

Patuxent

Wicomico

Potomac

Pocomoke

Rappahannock

York

James

RGB image (645,555,469) of Chesapeake Bay and tributaries

SeaDAS Training ~ NASA Ocean Biology Processing Group

slide6

RGB image: 250-m resolution

SeaDAS Training ~ NASA Ocean Biology Processing Group

slide7

nLw(645): 250-m resolution

-0.1

mW cm-2m-1 sr-1

3.0

SeaDAS Training ~ NASA Ocean Biology Processing Group

slide8

water

SWIR

VIS

NIR

Use of MODIS SWIR bands in coastal waters

Water absorption in SWIR >> NIR by more than one order of magnitude

In SWIR, ocean is black evenin turbid waters, Lw(SWIR) = 0

See Wang and Shi, Geophys. Res. Let.32 (2005)

SeaDAS Training ~ NASA Ocean Biology Processing Group

slide9

Chl retrievals using SWIR bands

NIR-based Aerosols

SWIR-based Aerosols

SeaDAS Training ~ NASA Ocean Biology Processing Group

slide10

Preliminary results for the Chesapeake Bay

upper

middle

lower

SeaDAS Training ~ NASA Ocean Biology Processing Group

slide11

References

http://oceancolor.gsfc.nasa.gov/DOCS/modis_hires/

B.A. Franz et al., “MODIS land bands for ocean remote sensing applications,” Proc. Ocean Optics XVIII, Montreal, Canada, 9-13 October 2006.

http://oceancolor.gsfc.nasa.gov/DOCS/Publications/Franz_2006_ooxviii.pdf

SeaDAS Training ~ NASA Ocean Biology Processing Group