A Method for Automatically Drawing Meteorological Contours in the Sea-land Ecotone

Abstract

The invention discloses an automatic drawing method for land-sea ecotone meteorological isolines. The automatic drawing method includes steps of 1) reading data from multi-dimensional marine meteorological data, acquiring land-sea boundary data, and isolating marine regional data by overlay analysis; 2) setting a threshold value of judging a noisy point, judging each pixel, and if a pixel is the noisy point, correcting the pixel to acquire an effective numerical range of the marine region; 3) dividing the whole region according to the effective numerical range of the marine region; 4) respectively constructing interval tables of the marine region and other regions, and setting intervals with uneven densities on each region; 5) combining the intervals of the marine region and other regions; and 6) reading batch data through MATLAB (matrix laboratory ), and applying the intervals to MATLAB isolines drawing instructions to achieve the automatic drawing. By the automatic drawing method, the isolines effectively highlight changes of marine regional factors, show meteorological factors of a land region at the same time and can be applied to the fields, such as drawing a thematic map of the land-sea ecotone meteorology.

Description

technical field [0001] The invention relates to the technical field of marine meteorological contour drawing. In particular, it relates to a method for automatically drawing meteorological contours in the sea-land ecotone. Background technique [0002] Contour is a smooth curve formed by connecting points with equal values ​​in the mapping object. It has very important uses in many fields such as hydrology, geology, ocean, atmosphere, etc., such as isobar maps in pressure fields and geodetic mapping. Contour maps of ore body contour maps in geology, etc. At present, the methods of contour drawing and filling are relatively mature, but there are problems in the field of marine meteorology. Oceanographic meteorological data includes land and ocean areas, and element values ​​vary gradually over oceans but significantly over land. Using the traditional method of contour interval setting will make the contours concentrated in the land area, and there is a lack of distinguisha...

AI Technical Summary

Problems solved by technology

This method can often get good results, but the drawing process is cumbersome, time-consuming and labor-intensive

The method of area statistics solves the problem of manual drawing to a certain extent, and can realize business batch processing, but when it is applied to special data such as marine meteorology, the drawn contour effect cannot meet professional requirements

For example, the interval of atmospheric isobars usually needs to be set to a specific value, such as 2.5 hPa or 4 hPa, and the method of area statistics is only divided according to the principle of equal area, which cannot solve such special needs

Images