Uncertainty in Spectral Red-Edge Features of Inundated Marsh Canopies
Abstract
A combination of a shallow water reflectance model and a canopy reflectance model was used to simulate the spectral effects observed inundation levels increase in a largely erectophile marsh canopy. Information from the Lee shallow water in particular, helped explain the key spectral features observed during high water levels. However, the simulation results also suggested interesting implications regarding the nonlinear mixing of water and vegetation reflection spectra, as found in marsh or other flooded canopies. As water level increases, the influence of leaf reflectance below the water's surface changes the characteristics of the background aquatic spectrum. In particular, the simulation yielded a 20 nm shift in the red-edge position as water rose from the bottom to the top of the canopy, which is very similar to the experimental results. This suggests that the interaction of water and chlorophyll absorption features and leaf reflectance near the red-edge of the vegetation spectrum can significantly the influence red-edge position of an inundated canopy. This in turn could affect the use of the red-edge position for indicating plant condition in remote sensing applications of inundated vegetation.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2013
- Bibcode:
- 2013AGUFM.H13G1438T
- Keywords:
-
- 0480 BIOGEOSCIENCES Remote sensing;
- 0497 BIOGEOSCIENCES Wetlands;
- 1890 HYDROLOGY Wetlands;
- 1990 INFORMATICS Uncertainty