grid. The river channel data consisted of sonar point data
measured in cross-sections or longitudinal lines. The distance be-
tween cross-sections was in Lapua c.
200 m, in Pori 50–70 m and
in Kittilä 40–
200 m. In Salo the echo sounding was done in longi-
tudinal lines, with point spacing 0.5–1 m and line spacing 2–
10 m. For minimization of the interpolation errors, the channel
was interpolated
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