pho·to·gram·me·try 
(fō′tə-grămĭ-trē)
(fō′tə-grămĭ-trē)n.
1. The process of making maps or scale drawings from photographs, especially aerial photographs.
2. The process of making precise measurements by means of photography.
pho′to·gram·metric (-grə-mĕtrĭk) adj.
pho′to·gramme·trist n.