Comparison: Admiralty - French Admiralty and EVS
Comparison of Admiralty Chart, French Admiralty Chart and EVS Shorelines
The above map is taken from Bulletin 70, Bernice P Bishop Museum (1930). It is a copy of an Admiralty Nautical Chart No. 2868 and French Admiralty Chart No. 4962. The red "fat" shoreline is my digitized EVS shoreline. It was taken from Landsat S-06-20_2000.
I will acknowledge that the nautical charts were based on pre-satellite cartographic skills. These charts are off. They are 1-minute by 1-minute off from the true position of Tubuai Island. The brown lines are the charts lat / lon (23 23S 149 27W) whereas the red line shows the map's lat / lon (23 23S 149 27W). The chart is off by 1.7-kilometers.
The misplot is either due to a datum difference (Unknown datum compared to WGS-84) or an error. I would tend to favor the error problem, but it could be a datum problem.
