The Influence of Quality Setting in SURE
With SURE you can choose to run a Project in Quality Ultra or High. The default Quality varies depending on the scenario.
Default (UAVs, Close Range)
This article elaborates on how the Quality Setting reflects on the results and their production.
The Quality Setting primarily refers to the resolution of the Input Images used for the 3D reconstruction. Quality Ultra means that the Input Images are used at their original (full) resolution. When choosing Quality level High, the Input Images are down-sampled once. Therefore, the size of one pixel in object space gets doubled.
Independently of the image resolution used for the 3D reconstruction (dense image matching), SURE uses the full image resolution for texturing the final results (True Orthos, meshes).
The choice of quality setting affects the resolution of results and the processing performance.
Resolution of results
The quality level has a direct impact on the level of geometric detail of the resulting reconstruction. The depth precision of the reconstructed points is maximized when quality Ultra is used. A higher depth precision leads to an increase in edge sharpness and generally more accuracy in the final results.
SURE estimates the nominal Ground Sampling Distance of the input images, at the selected quality level, in order to use it as pixel size for the output raster products (DSM, True Ortho).
Processing performance and disk space requirement
The number of reconstructed points will naturally decrease, as the Quality level is lowered, because of the smaller number of pixels in the down-sampled images being matched. For Quality High, the density of points decreases by a factor of 4, approximately.
For generating raster products, we recommend to use a GSD parameter, that is similar to the GSD of the Input Images used for Dense Matching.
Recommended Quality Setting