I am still working to connect e-Stat data together into a shapefile of postal boundaries in Japan. I have found myself encountering data from services that use the navitime.co.jp mapping platform. These coordinates seem to employ an unusual datum. There are some references on the web to it being the Tokyo Datum, and the constants present in some of the navitime code <https://gist.github.com/sbma44/49354581f45d3c7e10a9> indicate the Bessel Ellipsoid, which supports this idea.
However, there are some strange aspects to these coordinates, such as multiplying them by constants like 1E3 * Math.PI / 648E3. I have been unable to successfully transform them into a known coordinate system. Does anyone have experience with the coordinate system used by the Navitime API? Here's a link to a CSV file of coordinates and post codes: http://cl.ly/1e413I1u1c12/navitime.csv
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