magvar: Calculate magnetic declination for a given coordinates

In thlytras/rfgfs: Flight planner and companion package for FlightGear

Description

Calculates the magnetic declination for a given latitude, longitude and height.

Usage

magvar(lat, lon, h = 0, date = Sys.Date())

Arguments

lat	Latitude (North is positive)
lon	Longitude (East is positive)
h	Height, in feet
date	Date (as a Date object). Defaults to current date.

Details

This function uses the NIMA WMM2005 (World Magnetic Model). This is the exact same algorithm that FlightGear (via the SimGear library) uses, and in fact magvar is a port of the corresponding SimGear C++ function: https://github.com/FlightGear/simgear/blob/next/simgear/magvar/coremag.cxx

Value

Returns the magnetic declination (in degrees) for the specified latitude, longitude and height.

thlytras/rfgfs documentation built on May 31, 2019, 10:44 a.m.