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Reading: Digitization of Bromide Paper Records to Extract One-Minute Geomagnetic Data

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Digitization of Bromide Paper Records to Extract One-Minute Geomagnetic Data

Authors:

N Mashiko ,

Kakioka Magnetic Observatory, Japan Meteorological Agency, 595 Kakioka, Ishioka-shi, Ibaraki 315-0116, Japan, JP
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T Yamamoto,

Meteorological Research Institute, Japan Meteorological Agency, 1-1 Nagamine, Tsukuba-shi, Ibaraki 305-0052, Japan, JP
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M Akutagawa,

Kakioka Magnetic Observatory, Japan Meteorological Agency, 595 Kakioka, Ishioka-shi, Ibaraki 315-0116, Japan, JP
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Y Minamoto

Kakioka Magnetic Observatory, Japan Meteorological Agency, 595 Kakioka, Ishioka-shi, Ibaraki 315-0116, Japan, JP
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Abstract

Many long-term geomagnetic observation results recorded on photographic bromide paper have not yet been fully digitized. To that end, we developed a method to automatically convert photographic records to one-minute digital data. We applied our method to the observation records of Kakioka Magnetic Observatory and confirmed that the resolution of time and amplitude could be greatly improved by numerical conversion compared with conventional data conversion by hand scaling. Our results suggest that highly precise digitization of analog magnetograms is possible.

DOI: http://doi.org/10.2481/dsj.WDS-046
How to Cite: Mashiko, N. et al., (2013). Digitization of Bromide Paper Records to Extract One-Minute Geomagnetic Data. Data Science Journal. 12, pp.WDS254–WDS257. DOI: http://doi.org/10.2481/dsj.WDS-046
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Published on 02 May 2013.
Peer Reviewed

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