geopath: Geopath - shortest trajectory line between two geographic...

In plotKML: Visualization of Spatial and Spatio-Temporal Objects in Google Earth

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),

See Also

kml_layer.SpatialLines, kml_layer.STTDF, fossil::earth.bear

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 documentation built on April 27, 2021, 3:01 p.m.