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I have a CSV file with point cloud data of a terrain. How do I use QGIS to calculate the volume of the terrain?

I tried using SAGA tool, natural neighbour, then use raster volume calculation. However, I am pretty skeptical about the result.

I think the parameters in natural neighbour has not been set correctly. Can anyone advise me on this?

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I think the parameters in natural neighbour has not been set correctly.

The parameters in the natural neighbor are not usually a problem, the default Method and Fit values give good results in most cases.

What is important is that you do not compute the volume outside the contour of the terrain.
Make sure to Clip Raster by Mask Layer before computing the volume.

Can anyone advise me on this?

Use the TIN Interpolation instead. Draw the break lines in a vector layer and add them to the procedure. Rarely does a land have no break lines.

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