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Original grid values are based on digitized magnetic anomaly maps of Finland on a 1 km x 1 km grid (First National Airborne Mapping Programme 1951-1972,relative anomalies by flux-gate instrumentation). Relative values were further made absolute by tying with long profiles flown 40 km apart from each other(Tie line survey 1968-69, proton magnetometer instrumentation). The profiles were reduced to 1965.0 using Geomagnetic data at Finnish observatories of Nurmijärvi and Sodankylä, and a moving base station for short term corrections. Magnetic anomaly was calculated by subtracting IGRF1965 from absolute values of F in 1965.0. Later on anomaly definition was changed to DGRF-1965.
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