EVRF2007: European Vertical Reference Frame の座標変換

Technical guide to EVRF2007 (EPSG:5621) —the European Vertical Reference Frame. Covers the geoid-based transformation H = h - N, ETRS89 compatibility, country-specific guidance for Poland, Germany, and the Netherlands.

EVRF2007 height (EPSG:5621) ↔/span> ETRS89 / WGS84

EVRF2007 Ellipsoidal, Orthometric Height

Conversion formula: H_EVRF2007 = h_ETRS89 - N_geoid

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

技術背景：EVRF2007

EVRF2007 (European Vertical Reference Frame 2007, EPSG:5621) defines a unified European height system based on normal heights (Helmert heights). It is the authoritative vertical reference for trans-national infrastructure, flood modeling, and geodetic work across the EU.

The Core Formula

The fundamental relationship between GNSS-derived ellipsoidal heights and EVRF2007 orthometric heights is:

H_EVRF2007 = h_ETRS89 - N_EVRF2007

Where: H = orthometric height (what engineers use), h = ellipsoidal height from GNSS, N = geoid undulation from the EVRF2007 national geoid model.

Country-Specific Geoid Models

  • Poland: EPSG:9719, uses pl_gugik_geoid2011-PL-EVRF2007-NH.tif via PROJ vgridshift. Centimeter accuracy.
  • Netherlands: RDNAPTRANS2018 includes both horizontal (RD New) and vertical (NAP) correction via NSGI grid. See: RD New Converter
  • Germany: DHHN2016 for national heights, connected to EVRF via BKG geoid models.

Legal and Infrastructure Implications

EU national laws and construction standards often mandate EVRF2007 for cross-border projects. Germany, Poland, and the Netherlands require EVRF2007-compliant heights for flood defense design, levee certification, and transnational rail/road projects. Using a pre-EVRF2007 national datum without proper transformation can produce decimeter-level height biases, critical for sea-level flood modeling.

Related Calculators & 事例研究

RD New Converter FEMA Flood Datum NAVD88, NGVD29 Converter

技術FAQ

What is EVRF2007?

EVRF2007 is the European Vertical Reference Frame 2007 (EPSG:5621). It provides a unified height system using normal heights across Europe, replacing EVRF2000. It is the official vertical reference for transnational EU infrastructure and geodetic projects.

How is EVRF2007 different from national height datums?

National systems (e.g., Germany's DHHN2016, Netherlands NAP) are connected to EVRF2007 via country-specific geoid grids. Small but legally significant biases exist between national systems and EVRF2007, making the transformation mandatory for cross-border work.

What does 'H = h - N' mean in practice?

h is what your GNSS receiver reports (ellipsoidal height). N is the geoid model value at your location. H is the physically meaningful orthometric height, what a level measures. For FEMA-style flood work, H is what matters because it relates to sea level and water flow.