Agisoft Metashape

Agisoft Metashape => General => Topic started by: vlacima1 on October 02, 2018, 06:26:17 PM

Title: How does quality of dense cloud influence the resolution?
Post by: vlacima1 on October 02, 2018, 06:26:17 PM

Hello,
I want to ask how is it possible that the resolution of DEM is unfluenced by the changing of quality parameter (during building dense cloud) and the ortofoto is not?
I know that the lower quality means downscaling of original photos by factor 4, but how is it possible that the resolution of resulting orthophoto does not change?
Thank you, Markéta

Title: Re: How does quality of dense cloud influence the resolution?
Post by: stihl on October 03, 2018, 12:01:26 PM

The DEM is a direct product from an interpolation of the dense point cloud.
If you've selected medium quality for the dense point cloud, you'll end up with a point density 4 times lower than is possible at the highest setting.
This means that the interpolated DEM will be of a lower resolution than your project GSD, which directly correlates to the used camera and flight altitude.

The Orthomosaic is generated by projecting the undistorted Ortho photos either onto the DEM or another available mesh surface. Since they are being projected, the resolution of the DEM (or surface) is irrelevant.