Estimation of Water Qualtiy Parameters of Inland and Coastal Waters With the use Of a Toolkit for Processing of Remote Sensing Data

摘要

Deriving thermatic maps of water qualtiy parameters from a remote sensing image requires a number of processing steps, such as calibration, atmospheric correction, air/water interface correction, and application of water quality algorithms. A prototype software environment has recently been developed that enables the user to perform and control these procesisng steps. Main parts of this environment are: (i) access to the MODTRAN 3 radiative transfer code for removing atmospheric and air-water interface influences, (ii) a tool for analysing of algorithms for estimating water quality and (iii) a spectral database, contining apparent and inherent optical properties and associated water qualit parameters. The use of the software is illustrated by applying implemented algorithms for estimating chlorophyll to data from a spectral library of Dutch inland waters with CHL ranging from to 500 mug 1~-1. The algorithms curently implemented in the Toolkit software are recommended for optically simple waters, but for optically complex waters development of more advanced retireval methods is requried.