Open AccessErrata‐based correction of marine geophysical trackline data
Author(s) -
Chandler Michael T.,
Wessel Paul
Publication year - 2012
Publication title -
geochemistry, geophysics, geosystems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.928
H-Index - 136
ISSN - 1525-2027
DOI - 10.1029/2012gc004294
Subject(s) - bathymetry , geology , magnetic anomaly , geophysics , interpolation (computer graphics) , crossover , geodesy , raw data , systematic error , anomaly (physics) , seismology , statistics , computer science , oceanography , mathematics , physics , image (mathematics) , artificial intelligence , condensed matter physics
We announce the completion of 5,230 errata correction tables which remove extreme, obvious errors from the National Geophysical Data Center's marine geophysical trackline archive. Along with a range of error types correctable using along‐track analysis, we determined that ∼62% of gravity surveys omit raw measurements and that ∼89% of magnetic anomalies are outdated and require recomputing. These errata tables reduce median global crossovers from 27.3 m to 24.0 m (bathymetry), 81.6 nT to 29.6 nT (magnetic anomalies) and 6.0 mGal to 4.4 mGal (free air gravity). We consider these methods gentler and more fundamental than the predominant crossover approach in that along‐track corrections affect only data flagged as erroneous by a reviewer; the vast majority of data are left unchanged. Removal of obvious errors is an important initial step that should precede crossover analysis, interpolation, and gridding, thereby strengthening the scientific analysis.