一些实景三维生产软件,在生产obj或者osgb格式三维模型时,会附带一个metadata.xml文件,该文件的作用是对三维模型数据进行描述,例如下面所示:
<?xml version="1.0" encoding="utf-8"?>
<ModelMetadata version="1">
<!--Spatial Reference System-->
<SRS>PROJCS["UserOptimized (source EPSG:4326 target 340025)", GEOGCS["UserOptimized (source EPSG:4326 target 340025)", DATUM["GCS_UserOptimized", SPHEROID["WGS 84",6378137,298.257223563, AUTHORITY["EPSG","7030"]], TOWGS84[-1439.501680589873,1986.479268679007,2409.080151751747,-5.447047608241281,6.064381314410012,6.713206989010258,-537.6771978944238]], PRIMEM["Greenwich",0, AUTHORITY["EPSG","8901"]], UNIT["degree",0.0174532925199433, AUTHORITY["EPSG","9102"]]], PROJECTION["Transverse_Mercator", AUTHORITY["EPSG","9807"]], PARAMETER["latitude_of_origin",43.86319681396127], PARAMETER["central_meridian",125.3061135896932], PARAMETER["scale_factor",0.9995], PARAMETER["false_easting",-2807.853239986995], PARAMETER["false_northing",0.0001252954845933994]]</SRS>
<!--Origin in Spatial Reference System-->
<SRSOrigin>-12500,-14500,0</SRSOrigin>
<Texture>
<ColorSource>Visible</ColorSource>
</Texture>
</ModelMetadata>
目前我们自己研发的OSGB生产软件,暂时不附带这个metadata.xml文件,现在也想生产这个xml文件,请详细解释下xml中各个参数的意义,以及哪些参数是必备项,假设我模型的坐标系是UTM_Zone_52_Northern_Hemisphere,坐标范围是上:4704429.0503,左:624199.002295,右:637336.746645,下:4688558.42814,那么我的metadata.xml该怎么写?