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Method for obtaining natural light scattering/direct light ratio on horizontal ground using remote sensing digital image and digital topographic map

A digital image, level ground technology, applied in the direction of using re-radiation, re-radiation of electromagnetic waves, measuring devices, etc., can solve problems such as low efficiency, time-consuming and labor-intensive, and achieve the effect of improving efficiency and accuracy

Inactive Publication Date: 2007-04-11
SHANGHAI UNIV
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Problems solved by technology

The conventional method of obtaining the scattering / direct radiation ratio is manual point-by-point measurement, which is time-consuming, laborious, and inefficient

Method used

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  • Method for obtaining natural light scattering/direct light ratio on horizontal ground using remote sensing digital image and digital topographic map
  • Method for obtaining natural light scattering/direct light ratio on horizontal ground using remote sensing digital image and digital topographic map
  • Method for obtaining natural light scattering/direct light ratio on horizontal ground using remote sensing digital image and digital topographic map

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Embodiment Construction

[0029] A preferred embodiment of the present invention is: referring to Fig. 1, this utilizes remote sensing digital image and digital topographic map to obtain the method for natural light scattering / direct radiation ratio on the horizontal ground, and concrete steps are:

[0030] (1) Input remote sensing digital images and corresponding digital topographic maps;

[0031] (2) Find shadows and calculate parameters: find similar pixels P1 and P2 respectively located in the sun and shadows (clouds and mountains) on the remote sensing digital image, and calculate their normalized sky light terrain illumination coefficients: G1 and G2 And the topographical illumination factor F1 of direct sunlight;

[0032] (3) Calculate the scattering / direct radiation ratio of the horizontal ground natural light in the shaded area:

[0033] L=DN2*F1 / (DN1*G2-DN2*G1)

[0034] Among them: DN1 and DN2 are the remote sensing values ​​corresponding to pixels P1 and P2;

[0035] (4) Calculate the sca...

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Abstract

This invention involves a method for obtaining the scattering / direct ratio of natural light on the ground via the remote sensing digital images and digital topographic maps. The steps are: Firstly, it inputs the remote sensing digital images and the corresponding digital topographic maps to search the shadow and calculate the parameters. Then, it calculates the natural light scattering / direct ratio of the shadow on the ground. Then, it calculates the natural light scattering / direct ratio of all the shadow on the ground. Then, it interpolating-calculates the natural light scattering / direct ratio of the points without shadow on the ground. Finally, it outputs the natural light scattering / direct ratio corresponding to the ground.

Description

technical field [0001] The invention relates to a method for obtaining the natural light scattering / direct radiation ratio on the horizontal ground, in particular to a method for obtaining the natural light scattering / direct radiation ratio on the horizontal ground by using remote sensing digital images and digital topographic maps. Background technique [0002] Scatter / direct radiation ratio is an important parameter to characterize atmospheric conditions, and has special significance in atmospheric environment, meteorology, environmental remote sensing, and remote sensing image processing. Due to the occlusion and shielding of the sky by the terrain, the distribution of sky scattered light on the natural surface will change due to the influence of the terrain. Due to the influence of terrain, not only the total illuminance of natural light on the ground is changed, but also the ratio of scattered light from the sky and direct sunlight from the sun in the natural light on t...

Claims

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Application Information

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IPC IPC(8): G01S17/95G01S17/89
CPCY02A90/10
Inventor 李先华
Owner SHANGHAI UNIV
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