The values for
D
D2 are always negative and are derived from the following formula:
TS_106
Δ
D
2
= -
H
R
· 10
6
D
D2
Reduction to mean sea level [ppm]
H
Height of EDM above sea level [m]
R
6.378 * 106 m
Atmospheric corrections in ppm with temperature [°C], air pressure [mb] and height [m] at 60%
relative humidity.
TS_108
-40
-35
-30
-25
-20
-15
-10
-5
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
105
11
0
11
5
120
125
130
135
140
50°C
50°C
40°C
40°C
30°C
30°C
20°C
20°C
10°C
10°C
0°C
0°C
-10°C
-10°C
-20°C
-20°C
550 mb
5000 m 4500
600
650
700
750
800
850
900
950
1000 1050 mb
550 mb
600
650
700
750
800
850
900
950
1000 1050 mb
4000 3500
3000
2500
2000
1500
1000
500
0 m
Atmospheric corrections in ppm with temperature [°F], air pressure [inch Hg] and height [ft] at
60% relative humidity.
TS_109
130°F
120°F
110°F
100°F
90°F
80°F
70°F
60°F
50°F
40°F
30°F
20°F
10°F
0°F
-10°F
-20°F
130°F
120°F
110°F
100°F
90°F
80°F
70°F
60°F
50°F
40°F
30°F
20°F
10°F
0°F
-10°F
-20°F
16
[ ft ]
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 inch Hg
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 inch Hg
1600015000140001300012000 1100010000 9000 8000 7000 6000 5000 4000 3000 2000
1000
o ft
-15
-20-25
-30-35
-40
-45-50
-55
-10
-5
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
105
11
0
11
5
120
125
130
135
140
145
Reduction to mean sea
level
D
D2
Atmospheric corrections
°C
Atmospheric corrections
°F
Technical Data
63