2024-03-28T13:59:04Zhttp://doidb.wdc-terra.org/oaip/oaioai:doidb.wdc-terra.org:63512021-01-07T11:59:10ZDOIDBDOIDB.GFZ
10.5880/GFZ.2.3.2017.003
Alternate_Mag_Absolutes - A software package for Magnetic Absolute Measurements with arbitrarily distributed DI Theodolite Orientations
Brunke, Heinz-Peter
Alternate_Mag_Absolutes - A software package for Magnetic Absolute Measurements with arbitrarily distributed DI Theodolite Orientations
2017
Potsdam, Germany
GFZ Data Services
http://dx.doi.org/10.5880/GFZ.2.3.2017.003
EARTH SCIENCE
EARTH SCIENCE SERVICES
DATA ANALYSIS AND VISUALIZATION
EARTH SCIENCE SERVICES
DATA MANAGEMENT/DATA HANDLING
TRANSFORMATION/CONVERSION
EARTH SCIENCE
SOLID EARTH
GEOMAGNETISM
GEOMAGNETIC FORECASTS
GEOMAGNETIC ACTIVITY
EARTH SCIENCE
SOLID EARTH
GEOMAGNETISM
MAGNETIC FIELD
geoscientificInformation
noise
noise
noise
methodology
measuring
noise analysis
Geomagnetic observatory
fluxgate
variometer
noise reduction
long term stability
DI-flux theodolite
Absolute measurments
numerical evaluation
dip equator
base line
base value
HDZ
base line stability
DI-Schema
magnetic field
declination
Deutsches GeoForschungsZentrum GFZ
GFZ
DATA CENTER CONTACT
Deutsches GeoForschungsZentrum GFZ
This data publication includes a matlab software package as described in Brunke (2017).
In addition to the Matlab software, we provide three test dataset from the Niemegk magnetic observatories (NGK).
We present a numerical method, allowing for the evaluation of an arbitrary number (minimum 5 as there are 5 independent parameters) of telescope orientations. The traditional measuring schema uses a fixed number of eight orientations (Jankowski et al, 1996). Our method provides D, I and Z base values and calculated uncertitudes of them. A general approach has significant advantages. Additional measurements may by seamlessly incorporate for higher accuracy. Individual erroneous readings are identified and can be discarded without invalidating the entire data set, a-priory information can be incorporated. We expect the general method to ease requirements also for automated DI-flux measurements. The method can reveal certain properties of the DI-theodolite, which are not captured by the conventional method. Based on the alternative evaluation method, a new faster and less error prone measuring schema is presented. It avoids the need to calculate the magnetic meridian prior to the inclination measurements. Measurements in the vicinity of the magnetic equator become possible with theodolites without zenith ocular.
DIF
9.8.2