Typhoon elliptical wind field parametric simulation method based on remote sensing image features

Abstract

The invention discloses a typhoon elliptical wind field parametric simulation method based on remote sensing image features. The invention relates to the field of satellite meteorological remote sensing information technology application. Through a remote sensing image analysis means and in combination with least square method ellipse fitting, ellipse center coordinates, ellipse long axis and short axis lengths and included angle parameters of the ellipse long axis and the x axis in the positive direction of the sea surface ellipse typhoon wind field are obtained through simulation, and the maximum wind speed space distribution range of the sea surface wind field in different directions is given. The method has the characteristics of simple operation and good real-time performance, the space-time heterogeneity distribution characteristic of the maximum wind speed radius of the sea surface wind field can be simulated, the obtained maximum wind speed point fitting ellipse can effectivelydescribe the space-time distribution range and orientation of sea surface wind field energy, and more accurate external drive can be provided for simulation of ocean dynamic processes such as storm surge and sea waves.

Description

technical field [0001] The invention relates to the application field of satellite meteorological remote sensing information technology, in particular to a typhoon elliptical wind field parametric simulation method based on remote sensing image features. Background technique [0002] Typhoon is a natural disaster with high frequency, wide range of influence, strong suddenness and great damage. The disaster-causing factors of typhoon disasters include strong wind, heavy rain, storm surge, and sea waves, among which strong wind is an important part of wind disasters, and also an important driving factor of disaster-causing factors such as storm surge and sea waves (see: "Fang Weihua, Lin Wei. Facing Disasters A review of typhoon wind field models for risk assessment. Advances in Geographical Sciences, 2013,32(06):852-867."). [0003] Regardless of whether it is calculating typhoon gale or constructing artificial typhoon, the maximum wind speed radius R max It is an important...

AI Technical Summary

Problems solved by technology

The method of cloud trace wind and water vapor guiding wind uses the continuous observation of cloud and water vapor characteristics in satellite cloud images to invert the wind field and obtain the wind vector; the inversion of the microwave sea surface wind field uses satellite scatterometers, altimeters, microwave radiometers, etc. to measure wind , the existing problem is that the temporal and spatial resolution of the obtained sea surface wind field is low (see: "Li Yanbing, Huang Sixun, Zhai Jingqiu. Overview of the progress of satellite retrieval wind field. Meteorological Science, 2009,29(2):277-284. ")

Regardless of whether it is based on empirical relationships or theoretical models, the calculation of the maximum wind speed radius of a typhoon is relatively complicated, and the uncertainty of the calculation results is large, and the calculation amount is relatively large

However, the temporal and spatial resolution of the sea surface wind field obtained based on microwave remote sensing data is low, which is not suitable for high-precision, real-time typhoon wind field inversion and typhoon key parameter extraction.

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