Please consider the following excerpt (from Rodrigo R, Zouqi M, Chen Z, Samarabandu J.: Robust and efficient feature tracking for indoor navigation):
Robust feature tracking is a requirement for many computer vision tasks such as indoor robot navigation. However, indoor scenes are characterized by poorly localizable features.
I am trying to understand what localizability is, and would appreciate help. (PS: I know there is a dsp tag called "local-features", but the tag currently has no definition.)