I have a historic paper map for the Indian Sub-continent which has been scanned. The Map is in Albers Equal Area Conical projection, and has the latitude and longitude grid on it.
I was trying to georeference in the projection of the source, but I do not have all the required parameters for this projection. Only the two standard parallels are noted on the map. I don't know the Central Meridian or the Latitude of origin, or the datum for that matter.
What should be done in this kind of situation? Since this is a map which spans 4000km by 4000km, I don't really think it is possible to get any kind of high accuracy output. I was thinking of georeferencing it in wgs84 Geographic coordinate system.
Is this a good idea? Or is there something else which you would suggest?