Method for realizing atmospheric correction of MODIS (moderate-resolution imaging spectroradiometer) image in turbid water body area

Abstract

The invention relates to a method for realizing atmospheric correction of an MODIS (moderate-resolution imaging spectroradiometer) image in a turbid water body area. The method comprises the following steps of: (1) reading an empirical relationship of actually measured standard water-leaving reflectivity of wave bands of 531, 551, 667 and 978 nm, a Rayleigh scattering look-up table, an MODIS image of the wave bands related by the model, synchronous atmospheric pressure, wind speed and ozone thickness data; (2) calculating the reflectivity contributed by each wave band Rayleigh scattering of the MODIS by using a Rayleigh scattering look-up table algorithm on the basis of meteorological data related in the step (1) and correcting the reflectivity; (3) building empirical relationships of thereflectivity of the wave bands of 531, 551, 667 and 978 nm by using the MODIS image data corrected by the Rayleigh scattering, (4) calculating the reflectivity contributed by aerosol scattering of each wave band of the MODIS by using an Angstrom aerosol exponential model on the basis of the step (4), and (5) calculating the reflectivity contributed by path radiance of the atmosphere based on the steps (2) and (4) and carrying out atmospheric correction on the MODIS image.

Description

technical field [0001] The invention relates to a method for realizing atmospheric correction of MODIS (Moderate-Resolution Imaging Spectroradiometer) images in turbid water areas, belongs to the field of water color quantitative remote sensing theory and application technology, and is suitable for the theoretical method and application technology research of water color quantitative remote sensing. Background technique [0002] The standard MODIS atmospheric correction algorithm is referred to as the "clean" water atmospheric correction algorithm. The basic assumption of this algorithm is that there is a "clean" water body in the study area (chlorophyll a concentration <0.5-1.0μg / l, suspension concentration is almost 0), then the off-water reflectance of the two near-infrared bands of MODIS is approximately zero, but due to Atmospheric scattering makes the signal detected by the sensor non-zero, so this part of the signal can be attributed to the contribution of atmosphe...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for realizing atmospheric correction of MODIS images in turbid water areas, to solve the defect that the standard MODIS atmospheric correction algorithm in the prior art cannot be applied in turbid water areas, and to realize atmospheric fine correction in turbid Class II water bodies

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