osgearth中geodetic和mercator初始的瓦片数不一样

最新推荐文章于 2023-04-12 17:16:32 发布

hankern

最新推荐文章于 2023-04-12 17:16:32 发布

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分类专栏： osg osgearth 地理信息gis

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在osgEarth/Registry中

if ( !_global_geodetic_profile.valid() )
    {
        GDAL_SCOPED_LOCK;

        if ( !_global_geodetic_profile.valid() ) // double-check pattern
        {
            const_cast<Registry*>(this)->_global_geodetic_profile = Profile::create(
                "epsg:4326",
                -180.0, -90.0, 180.0, 90.0,
                "",
                2, 1 );
        }
    }

if ( !_spherical_mercator_profile.valid() ) // double-check pattern
        {
            // automatically figure out proper mercator extents:
            const SpatialReference* srs = SpatialReference::create( "spherical-mercator" );

            //double e, dummy;
            //srs->getGeographicSRS()->transform2D( 180.0, 0.0, srs, e, dummy );
            //const_cast<Registry*>(this)->_global_mercator_profile = Profile::create(
            //    srs, -e, -e, e, e, 1, 1 );
            const_cast<Registry*>(this)->_spherical_mercator_profile = Profile::create(
                srs, MERC_MINX, MERC_MINY, MERC_MAXX, MERC_MAXY, 1, 1 );
        }

geodetic初始瓦片有两个，应该是分成了东西半球。