km2lon {clim.pact} | R Documentation

## Convert long-lat to km-km

### Description

The function computes the longitude from given the distance from a reference point. See also `km2lat` and `COn0E65N`.

### Usage

    km2lon(x, y, x.centre=0, y.centre=65)

### Arguments

`x` | not used.
`y` | distance from reference latitude in meridional direction.
`x.centre` | reference longitude.
`y.centre` | reference latitude.

### Value

real

### Author(s)

R.E. Benestad

### Examples

    library(clim.pact)
    data(oslo.t2m)
    print(c(oslo.t2m$lon,oslo.t2m$lat))
    #[1] 10.71667 59.95000
    xy<-COn0E65N(oslo.t2m$lon,oslo.t2m$lat)
    oslo.t2m$lon<-xy$x
    oslo.t2m$lat<-xy$y
    print(c(oslo.t2m$lon,oslo.t2m$lat))
    #[1]  595.4086 -560.3004
    lon<-km2lon(oslo.t2m$lon,oslo.t2m$lat,x.centre=0,y.centre=65)
    lat<-km2lat(oslo.t2m$lon,oslo.t2m$lat,x.centre=0,y.centre=65)
    print(c(lon,lat))
    #[1] 10.71667 59.95000

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