## Overview

The nvctr package implements the n-vector approach to geographical position calculations using an ellipsoidal model of Earth as described in (Gade 2010).

Implementations in various computer languages can be found at the n-vector page (Navigation Group 2010).

## Installation

You can install the development version of nvctr from GitHub with:

devtools::install_github("euctrl-pru/nvctr")

or the CRAN version (when this package will land to CRAN):

install.packages("nvctr")

## Usage

nvctr can be used to solve geographical position calculation like (example numbers refer to the ones in the vignette):

• Calculate the surface distance between two geographical positions (Example 5).
• Find the destination point given start point, azimuth/bearing and distance (Example 8).
• Find the mean position (center/midpoint) of several geographical positions (Example 6).
• Find the intersection between two paths (Example 9).
• Find the cross track distance between a path and a position (Example 10).

## References

Gade, Kenneth. 2010. “A Non-Singular Horizontal Position Representation.” Journal of Navigation. https://doi.org/10.1017/S0373463309990415.

Navigation Group, FFI. 2010. “The N-Vector Page.” https://www.navlab.net/nvector/.