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Low altitude aeroradiometric thorium maps (pseudo color) covering whole Finland. Aerogeophysical surveys were carried out during 1973-2007. The nominal flight alitude was 40 meters and flight line spacing 200 meters. Sample distance along the survey line has been 6-50 m depending on registration rate. The choice of standard flight direction (North-South and East-West) was made to suit the main geological trends
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In regard to product series, such as Detailed aerogeophysical survey, or Aerogeophysical low altitude maps at 1:20 000 scale, the intended areas or map sheets must first be selected with the "Area selection" tool in the map window and then be transferred with the "Download" or "Buy" button to the Shopping Cart or with "Order" buttom to the Order request form.