1. 사진측량 Photogrammetry 강원대학교 지구물리학과 이훈열 교수
Ref: Lillesand and Kiefer, Remote Sensing and Image Interpretation, 3rd ed., Chapter 4.

2. Photogrammetry
The science, art, and technology of obtaining reliable measurements, maps, digital elevation models, and other derived products from photographs.
Horizontal ground distance and angle
Heights from relief displacement
Heights from image parallax

3. Geometry of Vertical Photograph
From Loa and LOAA,
OAA=(H-hA)xa/f
From L’o’a’ and L’OA’A,
OA’A=(H-hA)(-xa’)/f.
Then,
B=OAA+OA’A
=(H-hA)(xa-xa’)/f
L (Lense) L’
B (Base) f f b xa a’
xa’
Image plane o a b’ o’
Parallax: apparent change of position due to viewing point H
pa=xa – xa’ OA
OA’ A
hA=H-Bf/pa OB
OB’ hA B
Similary,
hB=H-Bf/pb hB
hA-hB=Bf(1/pb-1/pa)