A 3D Point in PhotoModeler that has had its position in 3D space approximated but not processed by the 3D Processing algorithm. Under some circumstances (Camera Station have been successfully processed and have not been moved, and the point markings are accurate) an Approximated 3D Point will be quite accurate. Generally processing a project and turning all Approximated 3D Points into Processed 3D Points will improve the accuracy of these points.
3D Points are "approximate" when newly marked and referenced. Processed Points can become "approximate" if an associated Marked Point is moved, if the associated Camera Station is moved or the associated Camera is changed in some fashion. Approximate Points become "processed" after successful 3D Processing (Project Menu).