Package: nvctr 0.1.7

Enrico Spinielli

nvctr: The n-vector Approach to Geographical Position Calculations using an Ellipsoidal Model of Earth

The n-vector framework uses the normal vector to the Earth ellipsoid (called n-vector) as a non-singular position representation that turns out to be very convenient for practical position calculations. The n-vector is simple to use and gives exact answers for all global positions, and all distances, for both ellipsoidal and spherical Earth models. This package is a translation of the 'Matlab' library from FFI, the Norwegian Defence Research Establishment, as described in Gade (2010) <doi:10.1017/S0373463309990415>.

Authors:Enrico Spinielli [aut, cre], EUROCONTROL [cph, fnd]

nvctr_0.1.7.tar.gz
nvctr_0.1.7.zip(r-4.7)nvctr_0.1.7.zip(r-4.6)nvctr_0.1.7.zip(r-4.5)
nvctr_0.1.7.tgz(r-4.6-any)nvctr_0.1.7.tgz(r-4.5-any)
nvctr_0.1.7.tar.gz(r-4.7-any)nvctr_0.1.7.tar.gz(r-4.6-any)
nvctr_0.1.7.tgz(r-4.6-emscripten)
manual.pdf |manual.html✨
card.svg |card.png
nvctr/json (API)
NEWS

# Install 'nvctr' in R:
install.packages('nvctr', repos = c('https://euctrl-pru.r-universe.dev', 'https://cloud.r-project.org'))

Bug tracker:https://github.com/euctrl-pru/nvctr/issues

On CRAN:

Conda:

geographical-positionsn-vector

5.58 score 12 stars 32 scripts 175 downloads 23 exports 2 dependencies

Last updated from:0a8092e2b6. Checks:9 OK. Indexed: yes.

TargetResultTimeFilesSyslog
linux-devel-x86_64OK119
source / vignettesOK215
linux-release-x86_64OK126
macos-release-arm64OK95
macos-oldrel-arm64OK104
windows-develOK90
windows-releaseOK66
windows-oldrelOK88
wasm-releaseOK108

Exports:%>%along_track_distancealtitude_azimuth_distancecross_track_distancecross_track_intersectiondeglat_lon2n_En_E_and_wa2R_ELn_E2lat_lonn_E2R_ENn_EA_E_and_n_EB_E2p_AB_En_EA_E_and_p_AB_E2n_EB_En_EB_E2p_EB_Ep_EB_E2n_EB_ER_EeR_EL2n_ER_EN2n_ER2xyzR2zyxradunitxyz2Rzyx2R

Dependencies:magrittrpracma

Simple and Exact Solutions to Position Calculation

Enrico Spinielli

Rendered fromposition-calculations.Rmdusingknitr::rmarkdownon May 12 2026.

Last update: 2025-12-11
Started: 2019-02-07

Readme and manuals

Help Manual

Help pageTopics
Compute the along-track distance from a great circle arcalong_track_distance
Calculate the altitude, azimuth and distance of B from Aaltitude_azimuth_distance
Compute the cross-track distance from a great circle arccross_track_distance
Calculate cross-track intersectioncross_track_intersection
Convert angle in radians to degreesdeg
Convert (geodetic) latitude and longitude to n-vectorlat_lon2n_E
Find 'R_EL' from n-vector and wander azimuth anglen_E_and_wa2R_EL
Convert n-vector to latitude and longituden_E2lat_lon
Find the rotation matrix R_EN from n-vectorn_E2R_EN
Find the delta position from two positions A and Bn_EA_E_and_n_EB_E2p_AB_E
Find position B from position A and deltan_EA_E_and_p_AB_E2n_EB_E
Convert n-vector to cartesian position vector in metersn_EB_E2p_EB_E
nvctr: non-singular geographical position calculationsnvctr-package nvctr
Convert cartesian position vector in meters to n-vectorp_EB_E2n_EB_E
Select the axes of the coordinate frame ER_Ee
Find n-vector from the rotation matrix (direction cosine matrix) 'R_EL'R_EL2n_E
Find n-vector from R_ER_EN2n_E
Find the three rotation angles about new axes in the xyz order from a rotation matrixR2xyz
Find the three angles about new axes in the zyx order from a rotation matrixR2zyx
Convert angle in degrees to radians.rad
Make input vector unit length, i.e. norm == 1unit
Create a rotation matrix from 3 angles about new axes in the xyz order.xyz2R
Create a rotation matrix from 3 angles about new axes in the zyx order.zyx2R