Hofmann-Wellenhof B., Moritz H. Physical Geodesy
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line of steepest descent
grad Dg
Dg = 20 mgal
Dg = 30 mgal
Dg = 40 mgal
P
geoid
earth's surface
P
0
H
xy
z
a
b
s
z
l
dm
P
P
b
a
z
c
P
bc-
b
2
1
c
a
P
aa=
1
®
aa=
2
P
H
P
0
P
P
0
H
H
P
B
A
earth's surface
Bouguer plate
geoid
H -
P
H
Dm
+
Dm
–
P
P
0
H
H
P