5-2 Special mapping equations 189
N
r
P
p = π(P )
O = O
∗
∆ =
π
2
− Φ
Fig. 5.20. The gnomonic projection of the sphere.
Last but not least, we present to you a nice sample of the polar gnomonic projection of the sphere in
Fig. 5.21.
Fig. 5.21. Special perspective map of the sphere S
2
R onto the tangent space T N S
2
R : gnomonic projection,
Tissot ellipses, polar aspect, graticule 15
◦ , shorelines.
N
r
P
p = π(P )
O = O
∗
∆ =
π
2
− Φ
Fig. 5.20. The gnomonic projection of the sphere.
Last but not least, we present to you a nice sample of the polar gnomonic projection of the sphere in
Fig. 5.21.
Fig. 5.21. Special perspective map of the sphere S
2
R onto the tangent space T N S
2
R : gnomonic projection,
Tissot ellipses, polar aspect, graticule 15
◦ , shorelines.