Part i aggregate i2 band compare to m7 band
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VIIRS Aggregation of the I2 band to produce the M7 Band. Part I: Aggregate I2 band, Compare to M7 band. Draft - Preliminary Study. USM , NRL Stennis. Ryan Vandermeulen and Robert Arnone Sherwin Ladner , Paul Martinolich. May 28, 2013. 2.

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Part I: Aggregate I2 band, Compare to M7 band

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Part i aggregate i2 band compare to m7 band

VIIRS

Aggregation of the I2 band

to produce the M7 Band

Part I:Aggregate I2 band,Compare to M7 band

Draft - Preliminary Study

USM , NRL

Stennis

Ryan Vandermeulen and Robert Arnone

Sherwin Ladner , Paul Martinolich

May 28, 2013


Part i aggregate i2 band compare to m7 band

2

VIIRS – Visible/NIR Spectrum

I2 – 375 and M7 750m Similar Spectral response

Band used for Atmospheric Correction


Part i aggregate i2 band compare to m7 band

Objective:

Can the I2 band at 375 m be aggregated to 750m similar to the M7 bands?

What is the correlation between the Aggregated I2 and M7 bands?

What affect does it have on the ocean products?

- normalized water leaving radiance, ,

- chlorophyll


Part i aggregate i2 band compare to m7 band

Aggregation

  • November 08, 2012, GOMEX

  • I-2 band (375m) aggregated to 750-m resolution

    • 2 x 2 pixel average (non-weighted)

    • Comparison of Lt (I2 aggregated v M7).


Part i aggregate i2 band compare to m7 band

I2_aggregatedM

I2

M7 865

M7

Difference I2 – M7

Difference

-0.051

0.027


Part i aggregate i2 band compare to m7 band

Characterizing the Aggregation Differences in Land and Ocean

750–m resolution

Aggregated I-band

Lt_865 – Apr20, 2012

Ocean pixels

Mean diff = -0.006

Min = -0.017

Max = 0.006

Land pixels

Mean diff = 0.017

Min = -0.299

Max = 0.451

I2-M7 difference


Part i aggregate i2 band compare to m7 band

Aggregated I2 and M Bands (765 nm)

Whole Image

Scatterplot

Probability

density

Distribution

Off the 1:1 line !

Lt (M7)

0..00 4.0 8.0 12.0 16.00

Land

Water

0..00 4.0 8.0 12.0 16.00

Lt (I-2 aggregated)


Part i aggregate i2 band compare to m7 band

Impact of

Aggregated I2 and M Bands (765 nm)

Probability

density

Distribution

Off the 1:1 line !

Water only

Lt (M7)

0.19 0.21 0.24 0.26 0.28

Variance of the mean

Aggregation

The Aggregation is Lower

than the M7 band

0.19 0.21 0.24 0.26 0.28

Lt (I-2 aggregated)


Part i aggregate i2 band compare to m7 band

Quantifying the Differences

Lt: I2 – M7

-0.051

0.027

Difference in the Aggregation

ROI

Whole image (includes land)

Mean = -0.0017 ± 0.0676

ROI (ocean only)

Mean = -0.0075 ± 0.0034


Part i aggregate i2 band compare to m7 band

Part II: Ocean Color Atmospheric Impact through L2gen (ocean color processing) I2/M7 comparisonDefine: Lt = Top of AtmosphereLt – Lr = Rayleigh Removed La = Aerosol Optical depth

I2 - 862nm M7 – 865nm


Part i aggregate i2 band compare to m7 band

Apr20, 2012 –

Gulf of Mexico

I2-band (865 nm) v. M7-band (862 nm)

y = 0.9832x + 0.0115

R = .9990

Lt (M band)

Lt (I band)

TOA

Atmospheric Correction

Impact

  • Rayleigh

  • Corrected

  • Aerosol Optical

  • Depth


Part i aggregate i2 band compare to m7 band

Part III:Use Aggregated I2, place back into l2gen Ocean Color Processing Impact of I2 aggregated in ocean Products nLw(l)


Part i aggregate i2 band compare to m7 band

Impact of the I2 band aggregated with the M bands on nLw ( l )

nLw412

443

using the original M bands

n LW (l)

486

using the original M bands

n LW (l)

551

Chl a

671

nLw (l)

Using the I band aggregated

nLw (l)

Using the I band aggregated


Part i aggregate i2 band compare to m7 band

Chlorophyll mg/m3

Impact of I2 aggregated and M7 on chlorophyll product

3

0

1

2

Chlor_a

M7/M6 atmospheric correction

Standard

1

2

3

0

Chlor_a

I2(agg)/M6 atmospheric correction

I2 Aggregated

mg/m3

1

0

0.5

Diff - Chlor_a

I2 atm_corr – M7 atm_corr

Difference


Summary

Summary

  • Notes differences with the Aggregation of I2 and M7

  • M7 band has higher values than the I2 Aggregated band -

  • More scattering in the I2 aggregated in land that water

  • The variance on the I band 2x2 pixel mean appears to affect the M band comparison

  • Impact of the I band aggregation at M7 affects the nLw (l).

Future :

Define the influence of the variance with the 2x2 aggregation

Define where the scattering in I2 aggregation is occurring.


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