5-2 Special mapping equations 175
N
S
r
P
p
O
Q = π(P )
R
R
H
O
∗
D
Fig. 5.11. Spherical vertical section, the general normal perspective mapping of the sphere to the equatorial
plane. The geometrical details.
N
S
r
P
p
O
Q = π(P )
R
R
H
O
∗
D
Fig. 5.12. Spherical vertical section, the general normal perspective mapping of the sphere to the tangential
plane at the South Pole, projection plane at minimal distance. The geometrical details.