Geometric precision

This option specifies the tolerance level in input photos, which results in more or less detail in the computed 3D model:

Ultra: ultra high precision. Warning: highly memory and computation time consuming, not recommended for large areas.
Extra (default): extra precision, larger file size (tolerance of 0.5 pixel in input photos).
High: high precision, smaller file size (tolerance of 1 pixel in input photos).
Medium: medium precision, best suited for Orthophoto/DSM productions (tolerance of 2 pixels in input photos). The fastest and most memory-efficient mode.

Computation time and memory requirements

High and Extra modes are similar in terms of computation time and memory consumption.

Ultra mode is 4 times slower, and takes 4 times more memory than High or Extra mode.

Medium mode is 2-3 times faster, and takes 4 times less memory than High or Extra mode.