Glossary for Geospatial Science

Zoom Transfer Scope or ZTS:  An optical-mechanical device produced and marketed by Bausch and Lomb.  With it you can view and overlay two images through separate optical paths.  Usually one eye views a reference map and the other a portion of a color airphoto.  The scale, position, and orientation of either optical path can be changed so that the airphoto matches the map in some local area.  You then refer to the airphoto and mark interpretation lines on the map or a transparent overlay.  As the airphoto is moved slightly to register another subsection, you compile a map that has a minimum amount of distortion induced by the airphoto.