検索 and identify the top Coordinate Reference Systems, datums, and projections. Lookup EPSG 4326, 3857, 27700, and standard UTM zones.
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The EPSG registry provides unique numerical identifiers for every coordinate reference system (CRS) on earth, standardizing how mapping software interprets latitude, longitude, and grid coordinates.
Use the explorer above to verify the properties of common EPSG codes. Never guess an EPSG code for an engineering project —mixing up NAD83 variants or selecting the wrong UTM zone will systematically corrupt your dataset.
EPSG originally stood for the European Petroleum Survey Group. The registry is now maintained by the International Association of Oil & Gas Producers (IOGP) Geomatics Committee.
EPSG:3857 is Web Mercator, designed for web mapping visually, not for accurate measurement. It dramatically inflates the size of objects far from the equator, making Greenland appear as large as Africa.
座標精度はデバイスや測地系によって異なります。以下の確認を行わずに実務で使用しないでください：