Geography Reference
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been worked out, but it is lengthy and does not offer too much of an insight. Instead we have
dealt with the integral ( 23.114 )by numerical integration.
Box 23.24 (The generic steps of a map projection for a given structure of the map ( 23.99 )of
type circular cylinder C
2
g ( V ) ).
The left Jacobi map
J l = x U x V
= g V 0
0
(23.100)
y U y V
f
subject to the orientation conservation
|J l | = x U y V − x V y U > 0 ↔ f > 0
(23.101)
The left Cauchy-Green map
(23.102)
C l : J l G r J l = g 2 V 0
0
= a 2 [
f 2
( n +1) ] n / ( n +1) 0
0
n
(23.103)
f 2
subject to the right metric tensor G r = I 2 of the developed circular cylinder
The general eigenvalue problem
(23.104)
C l
Λ 2 G l = 0
(23.105)
subject to left metric of the church tower of the onion shape
G l = g 2 ( V )
0
(23.106)
g 2 ( V )+ h 2 ( V )
0
subject to
g ( V )= acos n− 1 V [ cos 2 V ( n +1)
n ]
h ( V )=( n +1) cos n VsinV
(23.107)
G 11 = g 2 ( V )= a 2 cos 2 n Vsin 2 V
G 12 = 0
(23.108)
G 22 = g 2 ( V )+ h 2 ( V )= cos 2( n− 1) V ( n +1) 2 cos 2 Vsin 2 V
+ α 2 [ cos 2 V ( n +1)
n ] 2
Λ 2 G l =
g 2 V
C l
Λ 2 g 2 ( V )
0
=0
(23.109)
f 2 − Λ 2 ( g 2 ( V )+ h 2 ( V ))2
0
g V
g ( V ) = [ n/ ( n +1)] n/ 2
1
cos n VsinV
Λ 1 =
n +1
 
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