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Diffstat (limited to 'libtellurian.7')
-rw-r--r-- | libtellurian.7 | 13 |
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diff --git a/libtellurian.7 b/libtellurian.7 index 0933aa9..ae3dff0 100644 --- a/libtellurian.7 +++ b/libtellurian.7 @@ -95,3 +95,16 @@ radius of curvature for some latitude. See .BR libtellurian.h (0) for a listing of available constants. +.SH NOTES +Users, and developers in particular, shall be aware that +this library uses GPS coordinates which are geocentric. +This means that the latitude is base one the angle from +the centre on the earth. There are a number of other +systems, most famously as a linear function of the +arc length, or more commonly in geodesy, the geodesic +latitude which is the enable between the local normal +from the surface and equatorial plane. Users should +take great care ensure the correct correct system (GPS) +is used, and developers should be careful designing +functions for the GPS coordinate system and be aware +the geodesic formulae usually use geodesic latitudes. |