I would like to plot maps based on PZ-90.02 and PZ-90.11 in Russia, but in QGIS there is only PZ-90 to choose.
Can anyone explain how to create a proj4 record for these datums? For PZ-90 proj4 looks like this:
+proj=longlat +a=6378136 +b=6356751.361745712 +towgs84=0,0,1.5,-0,-0,0.076,0 +no_defs
but I have no knowledge about these values towgs84=0,0,1.5,-0,-0,0.076,0 +no_defs