Quote:
Originally Posted by CaliEs
I need the formula for calculating real world latitude / longitude data from SH3 positioning data.
Example from the exam navigation mission "Navigation.mis":
sub starting position:
SH3 data:
InitLongOff = 6856974.000
InitLatOff = 5584324.500
Estimated real world data:
Long 09.43°E
Lat 55.15°N
(start location is Aro sund / Denmark)
How to calculate from 6856974.000 to get 09.43°?
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Hi!
Table 7 on page 50 of the GWX Manual that gives you this information. Basically,
GWX latitude = 120 km/degree; Real latitude = ~110 - 111 km/degree
GWX longitude = 120 km/degree, real Longitude varies with latitude, so that it's about 111 km/degree at the equator, ~85 km at 40 degrees latitude, and 0 km at the poles.
There's a precise equation somewhere, but I've forgotten where it is.
Hope this helps!
__________________
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