TAVI regulatory factor algorithm based on solar altitude

A technology of sun altitude angle and adjustment factor, applied in the directions of calculation, image data processing, instruments, etc., can solve the problems of unfavorable large-scale popularization and application of TAVI, limiting the level of automatic application of TAVI, weak physical meaning, etc., and achieves obvious terrain correction effect. The effect of minimizing data cost and time cost and having strong physical meaning

Active Publication Date: 2017-04-26
FUZHOU UNIV
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Problems solved by technology

However, these two optimization algorithms are empirical and weak in physical meaning, and both need to classify remote sensing images; among them, the "optimization and matching" algorithm also needs the support of ground data, while t

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  • TAVI regulatory factor algorithm based on solar altitude
  • TAVI regulatory factor algorithm based on solar altitude
  • TAVI regulatory factor algorithm based on solar altitude

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Embodiment Construction

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] like figure 2 As shown, the present embodiment provides a TAVI adjustment factor algorithm based on the sun altitude angle, which specifically includes the following steps:

[0031] Step S1: preprocessing the remote sensing image, and generating image apparent reflectance data through the radiometric calibration of the remote sensing image;

[0032] Step S2: analyze the quality of the remote sensing images, and count the apparent reflectance data in the red light band and the near-infrared band of the remote sensing images; analyze whether the reflectivity of the mountain vegetation in these two bands is reasonable, and determine whether the image is normally available; usually the mountain vegetation red light The average reflectance in the band is around 0.05, and the average reflectance in the near-infrared band is greater than 0.2.

[0033] ...

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Abstract

The invention relates to a TAVI regulatory factor algorithm based on solar altitude. The method includes the following steps: conducting image pre-processing, analyzing the numerical distribution of image wave section apparent reflectance, extracting the solar altitude and computing a regulatory factor. According to the invention, the method obviates the need for DEM data and remote sensing image classification, independent from ground survey data, uses solar altitude in actual physics significance as a computing parameter, ensures that TAVI can effectively eliminate interference on vegetation information by orographic influence, can achieve the effects of orographic correction of a C model and even produces better effects, prevents the inversion of surface feature vegetation from being reduced in precision due to the difference between remote sensing images and DEM data registration accuracy, and provides scientific and economic basis for the large-scale application and promotion of the TAVI to the inversion of vegetation information of complex geography and mountains.

Description

technical field [0001] The invention relates to the field of TAVI adjustment factor algorithms, in particular to a TAVI adjustment factor algorithm based on the sun altitude angle. Background technique [0002] There are mainly two kinds of optimization methods for the adjustment factor f(Δ) in the existing published terrain adjustment vegetation index (TAVI): "optimization matching method" and "extreme value optimization method". [0003] The calculation steps of the "Optimal Matching" algorithm (National Patent No. 200910111688X) are: (1) Image classification, divide the shady and sunny slopes of the mountains in the remote sensing images, and select typical sample areas; (2) Target identification, with the help of ground survey data , field inspection data, aerial photography data or high-resolution image data of Google Earth, etc. to verify the homogeneity of the vegetation on the shady and sunny slopes, and identify the parts that are consistent or close to the vegetati...

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Application Information

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IPC IPC(8): G06T7/00
CPCG06T7/0002G06T2207/10032G06T2207/10048G06T2207/30184G06T2207/30188
Inventor 江洪毛政元肖桂荣
Owner FUZHOU UNIV
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