QGIS源码中WMS定义的像素大小 https://github.com/qgis/QGIS/blob/2897024aca21bbcc91a31f8487da4270e40db2e3/src/providers/wms/qgswmscapabilities.cpp#L1861
// the magic number below is "standardized rendering pixel size" defined
// in WMTS (and WMS 1.3) standard, being 0.28 pixel
tileMatrix.tres = tileMatrix.scaleDenom * 0.00028 / metersPerUnit;See Also: