Helicopter-borne Electromagnetics (HEM) German North Sea coast - Models (WMS)

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Provided by Bundesamt für Kartographie und Geodäsie

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Dataset information

Catalog
Country of origin
Updated
Created
2017.02.28
Available languages
German
Keywords
Schleswig-Holstein, elektrische Leitfähigkeit, Aerogeophysik, Niedersachsen, centroid depth, spezifischer Widerstand, Hubschrauber-Elektromagnetik, apparent resistivity, Schwerpunktstiefe, resistivity, infoMapAccessService, electrical conductivity, Halbraumwiderstand, airborne geophysics, Hansestadt Hamburg, helicopter-borne electromagnetics, Geology
Quality scoring
145

Dataset description

This dataset has been compiled within the BGR project "D-AERO-Auswertung" based on several survey area located along the German North Sea coast. The BGR helicopter (Sikorsky S-76B) is used for airborne geophysical surveying of the Earth’s subsurface. The standard equipment comprises the methods electromagnetics, magnetics and radiometrics. The active multi-frequency, helicopter-borne electromagnetic (HEM) system, which consists of circular (diameter about 0.5 m) transmitter and receiver coils (horizontal separation about 8 m) operating at five and since 2007 at six system frequencies, is housed by a flying tube (bird) about 40 m beneath the helicopter. The HEM system used before 2002 consisted of rectangular coils (horizontal separation slightly less than 7 m) and five system frequencies (0.4 - 190 kHz). The ratio of received and transmitted signal yields to the electrical conductivity down to 50/150 m depth in case of conductive/resistive subsurface. Horizontal resistivity (= inverse of conductivity) sections are derived at several depths from multi-layer inversion results (1D resistivity-depth models).
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