Hi Tony77

If you have a real shovel:
An inexpensive Contour Guage can be used to get some 2D curves.
(Googe "contour guage")

One curve could be left to right at the peak of the curves. (x direction)
Numerous cross section curves in the vertical direction can be taken. (y direction). These cross sections
can be aligned with the first curve. Then maybe a loft, or ?

Pictures of the results on the Guage can be imported to View/Image and traced.
( I think I would preserve the x,y,z orientations )

- Brian

For example: https://www.harborfreight.com/6-inch-contour-gauge-907.html

(Insert leaning on shovel joke here:-)