plotKML: geopath – R documentation

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geopath

Geopath — shortest trajectory line between two geographic locations

Description

Derives a SpatialLines class object showing the shortest path between the two geographic locations and based on the Haversine Formula for Great Circle distance.

Usage

geopath(lon1, lon2, lat1, lat2, ID, n.points, print.geo = FALSE)

Arguments

`lon1`	longitude coordinate of the first point
`lon2`	longitude coordinate of the second point
`lat1`	latitude coordinate of the first point
`lat2`	latitude coordinate of the second point
`ID`	(optional) point ID character
`n.points`	number of intermediate points
`print.geo`	prints the distance and bearing

Details

Number of points between the start and end point is derived using a simple formula:

round(sqrt(distc)/sqrt(2), 0)

where distc is the Great Circle Distance.

Value

Bearing is expressed in degrees from north. Distance is expressed in kilometers (Great Circle Distance).

Author(s)

Tomislav Hengl

References

fossil package (https://CRAN.R-project.org/package=fossil),

Examples

library(fossil)
ams.ny <- geopath(lon1=4.892222, lon2=-74.005973, 
          lat1=52.373056, lat2=40.714353, print.geo=TRUE)
kml.file = paste0(tempdir(), "/ams.ny.kml")
# write to a file:
kml(ams.ny, file.name=kml.file)

plotKML

Visualization of Spatial and Spatio-Temporal Objects in Google Earth

v0.8-1

GPL

Authors

Tomislav Hengl [cre, aut], Andrea Gilardi [ctb], Pierre Roudier [ctb], Dylan Beaudette [ctb], Edzer Pebesma [ctb], Michael Blaschek [ctb]

Initial release

2021-04-12