Double-geographic-longitude-latitude-grid dividing method

Abstract

The invention discloses a double-geographic-longitude-latitude grid dividing method. Geographic information data are obtained through a satellite, aerial remote sensing images and earth surface actual measurement, a double-geographic-longitude-latitude-grid expression module is established, double-geographic-longitude-latitude-grid regularized division is conducted on the geographic space of the earth surface, standard longitude-latitude-grid division and expression are conducted on the regions with low south latitude and low north latitude, rotary longitude-latitude-grid division and expression are conducted on the regions with high south latitude and high north latitude, divided geographic slices are expressed in multiple modes according to slice level rank numbers, the standard longitude-latitude range and the rotary longitude-latitude-grid range, conversion is conducted according to the requirements, and on the basis of a geographic dividing method based on a standard longitude-latitude grid, the accurate expression of the geographic space in the regions with high latitude is obtained. According to the double-geographic-longitude-latitude-grid dividing method, geographic poles are rotated, so that double longitude-latitude grids are established on the spherical surface of the earth, the regions with different degrees of south latitude and north latitude are divided according to the different longitude-latitude grids, and therefore the shortages, in the aspect of geographic space expression of the regions with high latitude, of the standard longitude-latitude grid and the shortages of tradition geographic division are overcome.

Description

technical field [0001] The invention relates to the application field of geographic information systems, in particular to a technology for spatial segmentation and expression of geographic information in dual-latitude and longitude grids. Background technique [0002] Geographic segmentation is a regularized division method for the spherical geographic information of the earth. In recent years, with the development and application of geographic information technology, various geographic segmentation methods have been widely used in network geographic information systems, three-dimensional digital earth and other applications as map data organization models. like Figure 1 to Figure 4 As shown in the figure, based on the convenient calculation requirements of computer images, the slices of geographic segmentation are often in the form of rectangles. However, because the standard latitude and longitude grids meet at a point at the north and south poles, the actual regional sha...

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Problems solved by technology

like Figure 1 to Figure 4 As shown, based on the convenient calculation requirements of computer images, the slices of geographic segmentation often adopt a rectangular shape. However, since the standard graticules meet at the north and south poles to form a point, the actual area shape is fan-shaped or trapezoidal. In high-latitude areas, there are large deformations or redundancy, which is not conducive to the plane visual interpretation of slice files, and there are defects such as low resolution and discontinuity in spatial expression in geographical location

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