View source: R/useful_commands.R
spT.geodist | R Documentation |
This geodetic distance provides the distance between the locations in Kilometers (k.m.) and Miles, using spherical law of Cosines.
spT.geodist(Lon, Lat, KM = TRUE) spT.geo.dist(point1, point2) spT.geo_dist(points)
Lon |
The longitude position. |
Lat |
The latitude position. |
KM |
A logical value, if 'TRUE' then output is in ‘kilometers’, otherwise in ‘miles’. |
point1 |
In the form of (longitude, latitude) position. |
point2 |
In the form of (longitude, latitude) position. |
points |
In the form of points 1:(longitude, latitude) 2:(longitude, latitude) positions. |
spT.geodist
is used to get geodetic distance in both miles and kilometers.
spT.geo.dist
is only used to get geodetic distance in kilometers with a different format.
spT.geo_dist
is only used to get geodetic distance in kilometers with a different format.
NYdata
, spT.grid.coords
.
## # Load 28 ozone monitoring locations of New York. data(NYdata) head(NYdata) NYsite<-unique(NYdata[,1:3]) # Find the geodetic distance in km spT.geodist(Lon=NYsite$Longitude, Lat=NYsite$Latitude, KM=TRUE) # Find the geodetic distance in miles spT.geodist(Lon=NYsite$Longitude, Lat=NYsite$Latitude, KM=FALSE) ## # using spT.geo.dist point1<-c(-73.757,42.681) point2<-c(-73.881,40.866) spT.geo.dist(point1,point2) # using spT.geo_dist points<-c(point1,point2) spT.geo_dist(points) ##
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