When you choose to build a DEM based on the Dense Cloud, Photoscan will
generate a DEM on the specified resolution, build from the the dense
points directly with an "Inverse Distance Weighting" (IDW)
interpolation.
The DEM resolution that is specified by Photoscan
is directly related to the Quality mode that was chosen when building
the Dense Cloud. Where a higher quality level means a higher density
'Dense Point Cloud' and thus a higher resolution that's available when
building a DEM (without upsampling the data).
When you choose
Mesh, the points get interpolated as a "Triangulated Irregular Network"
(TIN) where it linearly interpolates the Dense Points as small
triangles. The higher the specified resolution is, the smaller the
triangles are.
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