trackDistance | R Documentation |

Calculate the distances between subsequent 2-D coordinates using Euclidean or Great Circle distance (WGS84 ellipsoid) methods.

```
trackDistance(x1, y1, x2, y2, longlat = TRUE, prev = FALSE)
```

`x1` |
trip object, matrix of 2-columns, with x/y coordinates OR a vector of x start coordinates |

`y1` |
vector of y start coordinates, if x1 is not a matrix |

`x2` |
vector of x end coordinates, if x1 is not a matrix |

`y2` |
vector of y end coordinates, if x1 is not a matrix |

`longlat` |
if FALSE, Euclidean distance, if TRUE Great Circle distance |

`prev` |
if TRUE and x1 is a trip, the return value has a padded end value (\"prev\"ious), rather than start (\"next\") |

If `x1`

is a trip object, arguments `x2`

, `x3`

, `y2`

are
ignored and the return result has an extra element for the start point of
each individual trip, with value 0.0.

The `prev`

argument is ignore unless x1 is a trip.

Distance values are in the units of the input coordinate system when longlat is FALSE, and in kilometres when longlat is TRUE.

This originally used `spDistsN1`

, then implemented the sp
`gcdist`

source directly in R, and now uses `geodist`

.

Please see the traipse package for a more modern approach.

Vector of distances between coordinates.

Original source taken from sp package, but now using Helmert from Karney (2013) see the geodist package.

```
d <- data.frame(x=1:10, y=rnorm(10), tms=Sys.time() + 1:10, id=gl(2, 5))
tr <- trip(d, c("tms", "id"))
## the method knows this is a trip, so there is a distance for every
## point, including 0s as the start and at transitions between
## individual trips
trackDistance(tr)
## the default method does not know about the trips, so this is
##(n-1) distances between all points
trackDistance(coordinates(tr), longlat = FALSE)
## we get NA at the start, end and at transitions between trips
angles <- trackAngle(tr)
```

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