International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B7. Istanbul 2004
investigation of data throughout the estuary-gulf system. Such
an approach may eventually reveal useful correlation between
optically active components and spectral behaviour.Systematic
differences between different regions suggest that it is possible
to classify the St. Lawrence system into sub regions
characterized by different inherent and apparent optical
properties. The preliminary results suggest high Gelbstoff and
low suspended sediment influence in the estuary, while gulf
region is mainly dominated by oceanic Case-I waters. (Figures
3 and 4)
Sta 112 May 2000
0.016
DOM. — 7
0.012F
Qo A
nc
© Y
0.008 -
0.006 + \
0.004 r \
Reflect
0.002 } ta
| TZ |
400 450 50 50 60. 60°. 705 750 aw
Wavelength [nm]
Fig.3 Station 112, Gulf. Closer to Case-I properties.
(Two sets of measurement) .
Sta013 - Rho - 0.028 May 2000
D.025 T T
0.02} ZN J
0.015} A 4 i -
Reflectance
2e
ce
-
T
L
post Y -
À 1 1 1 | 1 Sp ge =
450 500 550 600 650 700 750 800
Wavelength [nm]
0
e
Fig.4 Station 13, estuary. Closer to Case-II properties.
(Two sets of measurement)
Sky reflectance by the seasurface is the main contaminant
factor. Selection of p is the main focus and it is important as
well in overcast skies, where it can be less than 0.028 (the
recommended value for overcast skies in the literature, Mueller
et.al, 2000) Shorter wavelengths seem to be less consistent
since they are more affected from sky reflectance, whitecaps,
seastate, and wind.
References
and J.-C. Therriault, 1998.
in Pigment-Poor
N.T. O'Neill
Remote Sensing Potential
Jacques A,
Chlorophyll
328
Moderately Turbid Case II Waters: Lower St.
Estuary . CJRS, vol. 24, no. 2, pp. 194-199.
Lawrence
Jacques, A. (2000). “La teledetection passive de la chlorophylle
dans l’Estuaire maritime du Saint-Laurent: optimisation
spectrale des algorithmes de télédétection et application au
SeaWiFS" PhD thesis, Departement de Géographie et
Télédétection, FLSH, Université de Sherbrooke, Québec,
Canada.
Koutitonsky, VG et GL Bugden, 1991. “The physical
oceanography of the Gulf of St. Lawrence: A review with
emphasis on the synoptic variability of the motion. In: The Gulf
of St. Lawrence: small ocean or big estuary?, J.C. Therriault
(Ed.), Can. Spec. Publ. Fish. Aquat. Sci., Vol. 113, pp. 57-90.
Mobley C.D., 1999. Estimation of the remote-sensing
reflectance from above-surface measurements. Applied Optics,
38(36), pp.7442-7455.
Mueller J.L., C. Davis, R. Arnone, R. Frouin, K. Carder, Z.P.
Lee, R.G. Steward, S. Hooker, C.D. Mobley and S.McLean,
2000. "Above-water radiance and remote sensing reflectance
measurement and analysis protocols", Chapter 10, NASA/TM-
2000-209966 OCEAN OPTICS PROTOCOLS FOR
SATELLITE OCEAN COLOR SENSOR VALIDATION,
revision 2 edited by Giulietta S. Fargion and James L. Mueller.
NASA-GSFSC, August 2000.
Pierre Larouche, 2000. “Results from the 2" St. Lawrence
Estuary and Gulf SeaWiFS Validation Cruise”, Sixth
International Conference on remote Sensing for Marine and
coastal Environments, Charleston, South Carolina, 1-3 May
2000.
S. Sathyendranath (2000) “Remote Sensing of Ocean Colour in
Coastal, and Other Optically-Complex, Waters" Reports of the
International Ocean-Colour Coordinating Group. IOCCG
Report no:3, 2000.
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