Method for precisely drawing coast line on satellite cloud picture

Abstract

The invention discloses a method for precisely drawing a coast line on a satellite cloud picture, and the method comprises the following steps: (1), collecting the temperature data, detected by an infrared detector on a geostationary satellite, of the sky above the Earth, and converting the temperature data into gray scale data; (2), determining the latitude and longitude of a sample point, corresponding to each element in an image gray scale matrix, on the Earth through a conversion rule; (3), obtaining the gray scale data of a corresponding satellite cloud picture according to the longitude and latitude of the coast line through employing a former formula for reverse calculation. In addition, because the pixels of the satellite cloud picture are discrete, the data of the longitude and latitude of the coast line is also discrete and measurement points are not corresponding to the pixels on the satellite cloud picture, the method improves drawing precision of the coast line on the satellite cloud picture through numerical fitting. The method can enable countries and regions on the satellite cloud picture to be easy to recognize. Compared with other theoretical methods, the method has the actual application meaning.

Description

technical field [0001] The invention relates to a processing technology of meteorological satellite cloud images, in particular to a method for accurately drawing coastlines on satellite cloud images. Background technique [0002] In view of the important role of satellite cloud images in the study of atmospheric circulation, medium and long-term weather forecasts, and disastrous weather, and the great harm that disastrous weather brings to human property and life safety, the study of satellite cloud images has become extremely important. important. The first thing to study it is to have the best way to convert the satellite grayscale matrix into a satellite cloud image and add coastlines. Assuming that the earth is the only source of the detected temperature, when the sky is cloudless, the temperature detected by the geostationary satellite can be regarded as the temperature of the earth's surface; when there are clouds in the sky, the detected temperature will be relative...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for accurately drawing the coastline on the satellite cloud image, so as to solve the problem of imperfect image and drawing of the coastline on the satellite cloud image at present

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