Method for accurately displaying current visual field through eagle eye window in three-dimensional map

Abstract

The invention provides a method for accurately displaying a current visual field by an eagle eye window in a three-dimensional map, which comprises the following steps of: 1, calculating a visual field cutting surface in an ECEF three-dimensional Cartesian coordinate system according to an observation position, an observation angle and the like, and submitting the calculated visual field cutting surface to a pixel shader; 2, drawing a rectangle, wherein texture coordinates of four corners of the rectangle are respectively set as longitude and latitude coordinates of four corners of a two-dimensional view display range; 3, in a pixel shader, converting longitude and latitude coordinates corresponding to pixels into ECEF three-dimensional Cartesian coordinates according to the ellipsoid parameters; and step 4, in the pixel shader, judging the positions between the ECEF three-dimensional Cartesian coordinates and each cutting surface, and determining whether the ECEF three-dimensional Cartesian coordinates are in the view field or not so as to output a corresponding diagram.

Description

technical field [0001] The invention relates to the technical field of three-dimensional earth visualization, in particular to a method for accurately displaying the current field of view in an eagle eye window in a three-dimensional map, which can quickly and accurately display the geographical range of the current three-dimensional observation in the eagle eye window. Further, the present invention can be extended to application scenarios such as rapidly and accurately displaying the geographical range observed by satellites. Background technique [0002] In the 3D earth visualization technology, it is often necessary to calculate the field of view that can be observed on the earth's surface from any specified observation position and direction in space, and display it in a two-dimensional view. The eagle eye window is one of the usage scenarios. The typical traditional method is: first calculate a series of example lines according to the boundary of the 3D view, find the...

AI Technical Summary

Problems solved by technology

[0004] (2) It is difficult to accurately calculate the observation range. The precise observation range needs to consider the horizontal viewing angle and vertical viewing angle, as well as factors such as observation direction, pitch, and roll angle. It is very complicated to properly handle these parameters with traditional methods;

[0005] (3) The observation range polygon needs to emit a large number of intersecting rays during calculation. To ensure sufficient fineness, it is necessary to use extremely fine subdivision granularity, and the calculation complexity is high

CPU-intensive calculations are required

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