removing outliers.FIG. 13 consists of FIGS. 13A, 13B, and 13C and is a flowchart that generally illustrates a process useful in a SLAM module when re-encountering a landmark.FIG. 14 illustrates one embodiment of a system architecture for visual localization.FIG. 15 illustrates an embodiment of a pre-filter for filtering outliers.GLOSSARY OF TERMSpose: the position and orientation, such as the posi