Different results when using different volume calculation methods.

Of the 3 possible methods for volume calculation, by profile difference, surfaces and mesh, they mainly focus on cross-sections and grid. For the results to be comparable, you must work with reasonably similar parameters. Such that the cross-section cutting interval is similar to the cell size in the grid. You cannot compare earthworks by cross-section difference with cuts every 20 metres, with the result obtained by mesh difference of 0.2 m size. The degree of precision is important when analyzing the surface.