Description Usage Arguments Value Examples
View source: R/functions_wmm.R
Function that takes in geodetic GPS location and annualized time, and returns the expected magnetic field from WMM.
1 | GetMagneticFieldWMM(lon, lat, height, time, wmmVersion = "derived")
|
lon |
GPS longitude |
lat |
GPS latitude, geodetic |
height |
GPS height in meters above ellipsoid |
time |
Annualized date time. E.g., 2015-02-01 = (2015 + 32/365) = 2015.088; optionally an object (length 1) of class 'POSIXt' or 'Date' |
wmmVersion |
String representing WMM version to use. Must be consistent with |
list
of calculated main field and secular variation vector components in nT and nT/yr, resp. The magnetic element intensities (i.e., horizontal and total intensities, h & f) are in nT and the magnetic element angles (i.e., inclination and declination, i & d) are in degrees, with their secular variation in nT/yr and deg/yr, resp.: x
, y
, z
, xDot
, yDot
, zDot
, h
, f
, i
, d
, hDot
, fDot
, iDot
, dDot
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 | GetMagneticFieldWMM(
lon = 240,
lat = -80,
height = 1e5,
time = 2022.5,
wmmVersion = 'WMM2020'
)
## Expected output
# x = 5814.9658886215 nT
# y = 14802.9663839328 nT
# z = -49755.3119939183 nT
# xDot = 28.0381961827 nT/yr
# yDot = 1.3970624624 nT/yr
# zDot = 85.6309533031 nT/yr
# h = 15904.1391483373 nT
# f = 52235.3588449608 nT
# i = -72.27367 deg
# d = 68.55389 deg
# hDot = 11.5518244235 nT/yr
# fDot = -78.0481471753 nT/yr
# iDot = 0.04066726 deg/yr
# dDot = -0.09217566 deg/yr
## Calculated output
#$x
#[1] 5814.966
#$y
#[1] 14802.97
#$z
#[1] -49755.31
#$xDot
#[1] 28.0382
#$yDot
#[1] 1.397062
#$zDot
#[1] 85.63095
#$h
#[1] 15904.14
#$f
#[1] 52235.36
#$i
#[1] -72.27367
#$d
#[1] 68.55389
#$hDot
#[1] 11.55182
#$fDot
#[1] -78.04815
#$iDot
#[1] 0.04066726
#$dDot
#[1] -0.09217566
|
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