250 
R(O-) R(O-) 
wavelength (nm) 
shallow shallow 
eutrophic mesotrophic 
(a) 
wavelength (nm) 
deep — - — rjver&canal 
(V 
Fig. 2.a The averaged backscattering albedo (o b and 2.b the measured subsurface irradiance reflectance R(0-),for each 
of the four water types 
(a) shallow eutrophic lakes 
(b) shallow mesotrophic lakes 
Figure 3 
(c) deep lakes 
(d) river & canals 
Spectral nature of the relationship between measured R(O-) and (is h for each of the four water types, 
with an example of the lowest and the highest correlations of R(O-) with co b . (See Table 2 for 
additional information on the regression equations, solar zenith angles etc.) 
Table 2 Linear reg 
equation; S y = sta 
f= coefficient of < 
sunny clear sky, h 
Sample 
shallow eutrophic 
LHA 
LWG 
LEL1 
LEL2 
LEL3 
LVU 
LLO 
LBR 
shallow mesotropk 
LNS 
LSA 
LWL 
deep meso-eutropl 
LSP1 
LSP2 
LWB1 
LWB2 
WR 
river & canal 
HIK 
ARK 
RVE1 
RVE2