Helicopter-borne Electromagnetics (HEM)

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) measuring system consists of circular (diameter about 0,5 m) transmitter and receiver coils (horizontal separation about 8 m) housed by a flying tube (bird) about 40 m beneath the helicopter. The ratio of received and transmitted signal yields to the electrical conductivity down to 50/150 m depth in case of conductive/resistive subsurface. The results are displayed as apparent resistivity (= half-space resistivity) and centroid depth at each of the six system frequencies ranging from 0.4 to 130 kHz. Furthermore, vertical and horizontal resistivity (= inverse of conductivity) sections are derived from multi-layer inversion results (1D resistivity-depth models).

Citation proposal
(2016) . Helicopter-borne Electromagnetics (HEM). https://gdk.gdi-de.org/geonetwork/srv/api/records/5d3c332a-bce3-498f-840f-3cbf19359aef

INSPIRE
SDS

INSPIRE

Identification

File identifier: 5d3c332a-bce3-498f-840f-3cbf19359aef XML

Hierarchy level: Series

Online resource

Resource identifier

code: 1ddf4c22-0b63-425f-be21-b7530e1b831f

Metadata language: German

Spatial representation type: Grid

Encoding

Format: WMS

Version: OGC:WMS 1.3.0

Format: PDF

Version: n/a

Format: georef. TIFF

Version: n/a

Projection

Classification of data and services

Topic category

Geoscientific information

Classification of data and services

Coupled resource

Classification of data and services

Coupled resource

Keywords

GEMET - INSPIRE themes, version 1.0 ( Theme )

Geologie
Geology

GEMET - Concepts, version 2.4 ( Theme )

Geophysik

Other keywords

Keywords ( Theme )

Aerogeophysik
Hubschrauber-Elektromagnetik
elektrische Leitfähigkeit
spezifischer Widerstand
Halbraumwiderstand
Schwerpunktstiefe
airborne geophysics
helicopter-borne electromagnetics
electrical conductivity
resistivity
apparent resistivity
centroid depth

Keywords ( Place )

Deutschland

Geographic coverage

Temporal reference

Temporal extent

Date ( Publication ): 2016-09-06

Quality and validity

Lineage: Erarbeitung im Rahmen diverser Projekte, in denen das aerogeophysikalische Messsystem der BGR in Deutschland eingesetzt wurde.

Conformity

Explanation: siehe dazu die angegebene Durchführungsbestimmung

Restrictions on access and use

Access constraints: Allgemeine Geschäftsbedingungen, siehe https://www.bgr.bund.de/AGB - General terms and conditions, see https://www.bgr.bund.de/AGB_en. Die bereitgestellten Informationen sind bei Weiterverwendung wie folgt zu zitieren: Datenquelle: HEM, (c) BGR, Hannover, 2016