## Point Nemo## (or, One Thousand and Four Hundred Miles from Anywhere)
Captain Nemo, from an illustration in the original printing of Verne's novel
The name chosen for this point was " There is a number of different "landmass" data sources, all of some finite precision, and all burdened with some errors. The solution presented here is based on the data from a CD-based publication issued in July of 1992 under the name of 'Digital Chart of the World' (or DCW for short) - put together by what was, at the time, US Defense Mapping Agency (now NIMA) - with the cooperation of Australia, Canada and the UK. However, this data source has a number of errors and omissions, some of which have been corrected before the file was used for this computation. To showcase the precision of the computational software used to solve the problem, the computation was done to a numerical resolution of better than 1mm (one millimeter, or about a twentieth of an inch). In reality, and given the fact that the exact location of the coastline is never surveyed with such high level of precision, is changing over time with both erosion and the continental drift and depends on the state of the tides, a precision of only about a meter or even a couple of meters would be more realistic. However, even if such lower precision was deemed adequate, the distances would still have to be computed as "geodesics" - mathematical lines of shortest distance between two points on the surface of an ellipsoid of rotation.
The geographic coordinates of the Point Nemo are: s48:52:31.748 w123:23:33.069Or, in decimal degrees: -48.875485556, -123.392519167 This point is exactly 2 688 220.580 meters (slightly more than
1 450 nautical miles)
away from the following three coastline points:s24:40:39.360, w124:47:25.872
Ducie Island (Pitcairn Island Group, South Pacific)s27:12:29.304, w109:27:33.120
Motu Nui / Rapa Nui ("Easter Island", South Pacific)s72:57:57.024, w126:22:30.793
Maher Island / Siple Island (Antarctica)In addition to the location of Point Nemo and its three nearest points on land, the map above shows the indexing scheme mentioned in the introduction. The cells are used to organize the land and coastline data for fast spatial search and distance computations.
Ducie Island on a satellite/areal image:
Motu Nui on a satellite/areal image:
The last of three points, Again, for comparison with the above, here is a satellite image of the same area:
Prepared by Hrvoje Lukatela,
date of first publication: |