Calvin, just so you know, the curvature of the fingerboard is not necessarily the same from end to end. Quite often it is flattish near the nut and then much more pronounced curve closer to the bridge, and the important thing is that between the two extremities the transition is completely smooth.
Think of a "contact path" directly under each string; that's how a good luthier will approach the fingerboard shaping, by getting the path right for each string, including the right amount of scoop from nut to FB end, then smoothing over the flats so that the fingerboard is even across the board from end to end. Then checking again there are no high spots, then a final polish.
It can be quite a few hours work.
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