I have MTM coordinates in the following format
df <- data.frame(xcentro = c(250605,250770,250871),ycentro = c(5186087,5185610,5186140))
and need them to be converted in the WGS84 format. I expect the rgdal library to be able to do that, but I fail in finding the correct epsg
The only way out I see would be to implement the conversion formulas https://stackoverflow.com/questions/27824732/how-to-convert-mtm-canada-coordinates-to-latitude-and-longitude but I cannot believe it was not already implemented somehow in rgdal.