I know how to define a CRS, but this particular one is giving me a headache. I was unable to find the EPSG code at spatial reference.
The main reason for asking this is that raster and vector data available from INEGI (Mexico) comes in ITRF 92. Also new cartography from the same source comes in ITRF 2008.
When I load a raster or a vector layer from INEGI their CRS properties only said "unknown datum based on GRS80 ellipsoid".
INEGI says that ITRF and WGS84 are "equivalent" to make maps in scales smaller than 1:50 000. Nevertheless I usually make maps in scales greater than 1:50 000
Any ideas are welcome, Thanks beforehand.