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

A technology for atmospheric correction and water body, which is applied in the research field of theoretical methods and applied technology of water color quantitative remote sensing, and can solve problems such as inapplicability

Inactive Publication Date: 2013-07-17
QINGDAO INST OF MARINE GEOLOGY
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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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  • Method for realizing atmospheric correction of MODIS (moderate-resolution imaging spectroradiometer) image in turbid water body area
  • Method for realizing atmospheric correction of MODIS (moderate-resolution imaging spectroradiometer) image in turbid water body area
  • Method for realizing atmospheric correction of MODIS (moderate-resolution imaging spectroradiometer) image in turbid water body area

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Embodiment Construction

[0041] In order to better illustrate a method for realizing atmospheric correction of MODIS images in turbid water areas involved in the present invention, the spectral data of the Yellow River Estuary, the Yangtze River Estuary and Taihu Lake were respectively measured by using the ASD field object spectrometer. On October 27 and 28, 2003, at the same time as the surface light optical quantity measurement was carried out in Taihu Lake, one scene of each MODIS image data was collected for algorithm analysis and accuracy evaluation. The invention relates to a method for realizing atmospheric correction of MODIS images in turbid water areas, and the specific realization steps are as follows:

[0042] Step (1): read in the empirical relationship between the standard water reflectance measured in the 531, 551, 667 and 678nm bands, Rayleigh scattering lookup table, MODIS images of the bands involved in the model, synchronous atmospheric pressure, wind speed and ozone thickness data ...

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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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B21/08G01S7/497
Inventor 陈军孙记红温珍河
Owner QINGDAO INST OF MARINE GEOLOGY
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