Method and device for calculating reflectivity of earth surface

A technology of surface reflectance and calculation method, which is applied in the field of surface reflectance calculation of the environmental disaster reduction satellite HJ-1, to achieve the effect of eliminating absorption and scattering, high accuracy, and restoring reflectivity

Inactive Publication Date: 2012-02-01
曹春香 +2
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Problems solved by technology

However, there is no calculation method and device for surface refl

Method used

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  • Method and device for calculating reflectivity of earth surface
  • Method and device for calculating reflectivity of earth surface
  • Method and device for calculating reflectivity of earth surface

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Embodiment Construction

[0021] Refer below figure 1 and Figure 4 Describe the present invention in detail:

[0022] (1) Inversion of atmospheric parameters

[0023] The inversion of atmospheric parameters utilizes the dark target method and the constant target method.

[0024] Dark target method: its basic principle is to assume that the remote sensing image to be corrected has dark pixel areas, surface Lambertian surface reflection, and atmospheric properties are uniform, and ignores the effects of multiple scattering radiation in the atmosphere and the diffuse reflection of adjacent pixels. The dark pixels with very small reflectance are due to the influence of the atmosphere, and the reflectance of these pixels is relatively increased. It can be considered that this part of the increased reflectance is due to the influence of atmospheric radiation. However, this method is not applicable if the vegetation in the area is sparse. Due to the requirement of the existence of water bodies or dense v...

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Abstract

The invention relates to a method and a device for calculating the reflectivity of an earth surface, which are used for HJ-1A/B satellites. The method comprises the following steps of: 1) acquiring the optical thickness of atmospheric aerosol by using middle-infrared bands of an HJ-1B charge coupled device (CCD) and an infrared camera on the basis of a dark target method, and acquiring the optical thickness of the atmospheric aerosol by using an HJ-1A large-width quick revisit characteristic on the basis of an invariant target method; 2) calculating a solar zenith angle and a solar azimuth angle and observing the zenith angle and the azimuth angle on the basis of an HJ-1A/binary extensible markup language (BXML) file and image data; 3) simulating radiance Lm on a star through moderate resolution atmospheric transmission (MODTRAN) on the basis of parameters acquired in the steps 1) and 2); 4) establishing an earth surface reflectivity lookup table through the step 3); and 5) calibrating the atmosphere by using the lookup table according to an atmospheric parameter and an image to be calibrated. By the method and the device, the absorbing and scattering performance of the atmosphere on a remote sensing image can be effectively eliminated, the reflectivity of an earth surface target can be recovered, the bottleneck of industry application is eliminated, and the application range of environment disaster reduction moonlet data is further expanded.

Description

technical field [0001] The present invention relates to a method and device for calculating the surface reflectance, in particular to a method and device for calculating the surface reflectance for the environmental disaster reduction small satellite HJ-1. Background technique [0002] "Environment and Disaster Monitoring and Forecasting Small Satellite Constellation" (hereinafter referred to as "HJ-1") is China's first small satellite constellation dedicated to environment and disaster monitoring and forecasting. day launch. The satellite load is as follows: [0003] [0004] HJ-1A / B will play an increasingly important role in future disaster monitoring and forecasting. Atmospheric correction is performed on the image to generate a surface albedo product, which is especially important for the generation of later products (such as vegetation index, leaf area index, soil moisture / water content, vegetation coverage). If the convenience and accuracy of atmospheric correct...

Claims

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Application Information

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IPC IPC(8): G01S7/48
Inventor 曹春香
Owner 曹春香
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