Interpreting 'GIS' in the geographical information science sense, I have a historical question about the 1936 OSGB datum following the 1936-62 retriangulation of Great Britain - hopefully not too off-topic..
Does anyone know of the reason for the 49°N 2°W "true origin" of the datum? Ordnance Survey website's closest comment on this appears to be:
The True origin latitude and longitude coordinates of the National Grid are 49 degrees north: 2 degrees west. The False origin latitude and longitude or coordinates are 49 degrees 45 minutes and 58 seconds north : 7 degrees 33 minutes 23 seconds west.
The False origin which lies slightly southwest of the Isles of Scilly was devised to ensure that all National Grid coordinates were positive
So the "false origin" at 0 Easting 0 Northing (approx 7.56°W 49.77°N) is chosen so the Scilly Isles and western point of Northern Ireland would remain in positive coordinates - an admirably egalitarian nationalist justification. But 2°W seems a very England-centric longitude, approximately bisecting the 1.7°E and 5.75°W extremes of the nation. And the only redeeming feature of 49°N seems to be that the 49°N 2°W "true origin" is marginally closer to a UK dependency (Jersey) than the French mainland. So why this parallel/meridian intersection?