High Definition Geomagnetic Model (HDGM)

NewHigh Definition Geomagnetic Model 2013

Directional drillers use the Earth's magnetic field as a natural reference frame to orient the drill bit. The azimuth of the bottom-hole assembly is inferred by comparing the magnetic field measured while drilling (MWD) with a geomagnetic reference field. Crustal magnetic anomalies constitute a significant source of error in directional drilling, if not accounted for in the geomagnetic reference field.

To meet increasing demand for accurate geomagnetic referencing, the U.S. National Geophysical Data Center (NGDC) produces the High Definition Geomagnetic Model (HDGM) which accounts for long-wavelength crustal magnetic anomalies. HDGM significantly reduces geomagnetic referencing errors.

The HDGM is available for purchase from NGDC.

2013-May-06, Stefan Maus


Last modified: Thursday, 19-Mar-2015 19:31:15 MDT