index-repère

Désignations

Codes : pays ou zone où la désignation a cours (CH, FR, DE, EU = Union européenne, INT = usage international). Une désignation barrée est déconseillée.

Définitions

anglais

A real mark, such as a cross or dot, lying in the plane or the object space of a photograph and used singly as a reference mark in certain types of monocular instruments, or as one of a pair to form a floating mark as in certain types of stereoscopes. In stereoscopic map plotting instruments which utilize a stereo pair of index marks, each mark is called a half-mark.