4 Replies Latest reply on Jan 24, 2012 3:45 AM by sebastian_4m

    Georeferencing to an Unknown Coordinate System


      I'm currently trying to georeference an old map (1955) however, I can't find the map's coordinate system in ArcGIS 9.3. The info I have is as follows

      Projection: Lambert
      Ellipsoid: Clarke
      Equal Distance of line: 100 metres

      It appears to be a Lambert equidistance projection but none of the projections in ArcGIS 9.3 have a Clarke ellipsoid. I have tried the various equidistant projections in ArcGIS 9.3 and even tried modifying the ellipsoid to Clarke but have had no luck. Can anyone help by pointing me in the right direction.