The data cover the road network maintained by the Finnish Transport Agency.
The inventory of the curve is done by recording the beginning and end points of the curve and how many degrees (gyroscope) the road turns between them. This gives the central angle of the curve and, based on the distance travelled, the calculated curvature (angle/length) and radius of the curve. This radius is always greater than the real beam, because the transition curve is not separated in terrain. Since very large rays are not relevant, they are left unreported in the case of direct or radius greater than 60.000 m. The measurement is performed centrally (separate instructions). The results are processed centrally in their own pre-system and then transferred to the road register.
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