Feature Analysis of Water Spectrum in Liaodong Gulf Based on Band Simulation of MODIS

Abstract

It is very important to explore the feature bands of MODIS for retrieving the water constituent by remote sensing. This paper aims to use derivative spectrum and continuum removal to extract the feature bands of the water spectrum in Liaodong Gulf. By simulation of MODIS band using in situ field spectrum, we can avoid the impact of atmosphere on information extraction and can directly find the feature bands of MODIS. It is shown that the two signal processing methods of derivative spectrum and continuum removal can reveal the character of water spectrum. The result shows that the water spectrum of Liaodong Gulf has evident character of case 2 waters. It have two peaks and three thoughs. The feature bands of the water spectrum in Liaodong Gulf are located at 9,13,14,15 band of MODIS. They are the bands with the center wavelength of 442, 665, 677 and 746 nm respectively, which are due to the water constituents such as chlorophyll a and suspended sediment and so on. They reflect the character of waters in Liaodong Gulf, so they can be selected to establish the algorithms to retrieve water constituent with MODIS data by remote sensing.