SGOG tile-based large region true three-dimensional geographic scene adaptive construction method
A construction method and large-area technology, applied in the field of self-adaptive construction of large-area true 3D geographic scenes, to enhance visual effects, overcome deformation and cracks, and reduce data volume
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[0070] The following is an embodiment of the present invention.
[0071] Considering the computing and storage capabilities of a single computer, this embodiment selects the earth in mainland China as the research area, and takes the ninth layer of SGOG as the modeling basis. The spherical side length of the grid is about 19.5km, and the radial edge length is about 12.4km. Download 1144 pieces of 90m resolution DEM data covering mainland China from the sharing website. Basic parameters: projection UTM / WGS-84, GeoTIF format, 3601×3601 pixels, elevation is the geodetic height relative to the WGS-84 ellipsoid.
[0072] The invention utilizes IDL language to process DEM model source data, uses OSG as a graphics engine, uses VS2010 as a platform, and uses standard C++ as a development language to construct an experimental system.
[0073] Such as Figure 7 As shown, the coordinate calculation and conversion of SGOG tile grid points are first performed, and the longitude and lati...
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