194 5 “Sphere to tangential plane”: polar (normal) aspect
N
r
P
p = π(P )
O
Φ
∆/2
S = O
∗
Fig. 5.25. Special perspective mapping: the Lagrange projection: the left chart. Together with the right chart,
a minimal atlas of the sphere is constituted.
N = O
∗
S
r
P
p = π(P )
O
|Φ|
|∆| /2
Fig. 5.26. Special perspective mapping: the Lagrange projection: the right chart. Together with the left chart,
a minimal atlas of the sphere is constituted.
N
r
P
p = π(P )
O
Φ
∆/2
S = O
∗
Fig. 5.25. Special perspective mapping: the Lagrange projection: the left chart. Together with the right chart,
a minimal atlas of the sphere is constituted.
N = O
∗
S
r
P
p = π(P )
O
|Φ|
|∆| /2
Fig. 5.26. Special perspective mapping: the Lagrange projection: the right chart. Together with the left chart,
a minimal atlas of the sphere is constituted.