Coordinate conversion of GPS system received data GPS received data is often three-dimensional coordinates, while in scientific research we usually use two-dimensional coordinates. Therefore, coordinate conversion must be performed. Here we introduce a coordinate conversion, that is, converting WGS84 coordinates to Gauss-Kruger coordinate system. There are many methods of digital map projection, and my country adopts Gauss-Kruger projection, which is a transverse ellipsoidal cylindrical conformal projection. An ellipsoidal cylinder is tangent to the earth ellipsoid on a certain meridian circle L0. This meridian is usually called the projection axis meridian. That is, the x-axis of the Gauss-Kruger projection rectangular coordinate system. The earth\'s equator intersects with the ellipsoidal cylinder to form a straight line. This straight line is orthogonal to the axis meridian, which is the y-axis of the plane rectangular coordinate system. The ellipsoidal cylinder is unfolded to obtain a plane rectangular coordinate system with (x, y) as coordinates. In order to reduce projection deformation, the ellipsoid is divided into many belts according to longitude, and each belt is projected separately. The 3-degree and 6-degree belts are often used. In order to prevent the y value from being negative, 500km is usually added to the y axis. Given the WGS84 coordinates (B, L), B is the latitude of the GPS positioning output result, and L is the longitude of the GPS positioning output result. For the conversion from WGS84 to Gauss-Kruger coordinates (x, y), see this software for details.
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