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).

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
Deutsch
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
code
EPSG:25832
 

Classification of data and services

Topic category
  • Geoscientific information
 

Classification of data and services

Coupled resource

Coupled resource
 
 

Classification of data and services

Coupled resource

Coupled resource
 
 

Keywords

GEMET - INSPIRE themes, version 1.0

  • Geologie

  • Geology

GEMET - Concepts, version 2.4

  • Geophysik

Other keywords

Theme

  • Aerogeophysik

  • Hubschrauber-Elektromagnetik

  • elektrische Leitfähigkeit

  • spezifischer Widerstand

  • Halbraumwiderstand

  • Schwerpunktstiefe

  • airborne geophysics

  • helicopter-borne electromagnetics

  • electrical conductivity

  • resistivity

  • apparent resistivity

  • centroid depth
Place

  • Deutschland
 
 

Geographic coverage

N
S
E
W
thumbnail


 

Temporal reference

Temporal extent
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

Conformity
Conformity
 

Conformity

Conformity
Conformity
Explanation

siehe dazu die angegebene Durchführungsbestimmung
 

Restrictions on access and use

Access constraints
Es gelten keine Zugriffsbeschränkungen
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

 

Responsible organization (s)

Contact for the resource
Organisation name

Bundesanstalt für Geowissenschaften und Rohstoffe (BGR)
Email

heli@bgr.de

 

Responsible organization (s)

Contact for the resource
Organisation name

Bundesanstalt für Geowissenschaften und Rohstoffe (BGR)
Email

heli@bgr.de

 

Metadata information

Contact for the metadata
Organisation name

Bundesanstalt für Geowissenschaften und Rohstoffe (BGR)
Email

geodatenmanagement@bgr.de

Date stamp
2026-01-13
Metadata language
Deutsch
Character set
UTF8
 
 

SDS

Conformance class 1: invocable

Access Point URL
Endpoint URL
Technical specification
 

Conformance class 2: interoperable

Access constraints

Limitation
 

Use constraints

Limitation
 

Responsible custodian

Contact for the resource
 
 
 

Overviews

overview

Spatial extent

N
S
E
W
thumbnail


Keywords

Aerogeophysik Halbraumwiderstand Hubschrauber-Elektromagnetik Schwerpunktstiefe airborne geophysics apparent resistivity centroid depth electrical conductivity elektrische Leitfähigkeit helicopter-borne electromagnetics resistivity spezifischer Widerstand
GEMET - Concepts, version 2.4
Geophysik
GEMET - INSPIRE themes, version 1.0
Geologie Geology

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Associated resources

Not available