|
|
|
Lee, Z., & Carder, K.L. (2002). Effect of spectral resolution on retrievals of water column and
bottom properties from ocean-color data.. Appl. Optics, 41(12), 2191-2201. Using an optimization technique, sub-surface properties of coastal and oceanic
waters were derived from measured remote-sensing reflectance spectra. These
data included both optically deep and shallow environments. The measured
reflectance covered a range from 400 to 800 nm with a 2 nm resolution. The
inversions used data binned into 5 nm, 10 nm, and 20 nm contiguous bands. They
were also binned to simulate MERIS, SeaWiFS and MODIS channels,
respectively. This study is designed to evaluate the influence of spectral resolution
and channel placement on the accuracy of remote-sensing retrievals, and to
provide guidance for future sensor design. From the results of this study, the
following were found: 1) use of 10 nm wide contiguous channels provides almost
identical results as found for 5 nm contiguous channels, 2) use of 20 nm
contiguous channels and MERIS provides comparable results to those with 5 nm
contiguous channels for deep waters; but use of contiguous 20 nm channels
perform better than MERIS for optically shallow waters; and 3) generally SeaWiFS or MODIS cannot provide accurate bathymetry retrievals, though both
work fine for deep, clearer waters (total absorption coefficient at 440 nm < 0.3
m-1). Including the 645 nm MODIS "land" band in its channel set improves
inversion returns for both deep and shallow waters. |
