DGN95 / SRGI to WGS84 変換ツール

Technical Summary: Convert Indonesian DGN95 and SRGI2013 geocentric datums to standard WGS84 applying EPSG:9472 coordinate frame rotations.

Interactive Transformation Tool

Input Local coordinates (Latitude / Longitude) to mathematically derive WGS84 outputs using EPSG:9472 (DGN95 to SRGI2013) Helmert approximations.



WGS84 Latitude: -
WGS84 Longitude: -
実務リスク警告

誤った測地系（データム）の指定や、グリッド・地上補正（Grid-to-Ground）を適用しない座標変換は、1〜400mの位置ズレを引き起こします。これは測量過失請求や施工紛争の代表的な原因です。

技術事例・判例を見る 契約上の測地系リスク リスク試算シミュレーター

Geodetic Shift Tolerances

While DGN95 is often assumed within ±1m of WGS84, high-precision engineering requires chaining through SRGI2013 using a 7-parameter shift to achieve ~0.2m mean residual accuracy.

Civil & Legal Implications

Badan Informasi Geospasial (BIG) explicitly treats older datums as obsolete. Misusing the 'DGN95 ≈ WGS84' assumption on offshore concessions can produce positioning errors larger than contractual tolerances.

Real-World Infrastructure Risk

Offshore LNG terminals and deep-water pipelines in Indonesia require sub-meter alignment. Relying on a 0-parameter shift can skew underwater asset positioning by over a meter.

Verify Global Datums

Always validate your site data before mobilizing construction or legal teams. Use our core converters to rule out fundamental geodetic errors:

Authority よくあるご質問 (FAQ)

Are DGN95 and WGS84 exactly the same?

No. While they are very close natively, tectonic plate movement and datum realization differences mean they diverge by up to 1 meter. Authoritative Indonesian mapping requires transformation to SRGI2013 for legal validity.