geodetic datum origin; standard datum of geographic coordinates
Technical term in surveying and cartography; refers to the fixed reference point from which longitude and latitude are measured in a given geodetic system.
Japan's geodetic datum origin is located at the Japanese Geodetic Datum Origin in Minato, Tokyo.
In surveying, coordinates are calculated based on the geodetic datum origin.
測地系 is the broader geodetic reference system, while 経緯度原点 is the specific physical origin point within that system.
日本経緯度原点 is the proper name of Japan's specific geodetic datum origin point, whereas 経緯度原点 is the generic term.
Compound of 経緯度 (longitude and latitude) + 原点 (origin point). A modern technical term with no obscure historical derivation.