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
 

Simple

Alternate title
HEM (Serie)
Date ( Publication )
2016-09-06
Identifier
1ddf4c22-0b63-425f-be21-b7530e1b831f
Status
onGoing On going

  Point of contact

GEMET - INSPIRE themes, version 1.0 ( Theme )
  • Geologie
  • Geology
GEMET - Concepts, version 2.4 ( Theme )
  • Geophysik
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
Access constraints
Other restrictions
Use constraints
Other restrictions
Other 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
Spatial representation type
Grid
Metadata language
German
Character set
UTF8
Topic category
  • Geoscientific information
N
S
E
W


Distribution format
  • WMS (OGC:WMS 1.3.0 )

  • PDF (n/a )

  • georef. TIFF (n/a )

OnLine resource
BGR-Website: Aeroelektromagnetik  

BGR-Website: Aeroelektromagnetik

Hierarchy level
Series

Conformance result

Date ( Publication )
2010-12-08
Explanation
siehe dazu die angegebene Durchführungsbestimmung
Statement
Erarbeitung im Rahmen diverser Projekte, in denen das aerogeophysikalische Messsystem der BGR in Deutschland eingesetzt wurde.

gmd:MD_Metadata

File identifier
5d3c332a-bce3-498f-840f-3cbf19359aef   XML
Metadata language
German
Character set
UTF8
Hierarchy level
Series
Hierarchy level name
Geophysik
Date stamp
2025-04-07
Metadata standard name
INSPIRE Metadata Implementing Rules: Technical Guidelines based on EN ISO 19115 and EN ISO 19119
Metadata standard version
n/a

  Point of contact

Website
https://www.bgr.bund.de  
 
 

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