When using a project with more than two photographs some care is needed to pick suitable photos for processing. In some projects you can let PhotoModeler Premium process all pairs automatically. This type of project would be one where all photos were parallel to a somewhat flat object and the photos were taken with a regular spacing. An example might be a line of photos taken at a regular interval perpendicular to a wall. PhotoModeler Premium will discard photos it determines to have no overlap (given the region defined by DSM Trims or other extents definition).