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Last data update: 2014.03.03

R: Calculate destination point

lawn_destination

R Documentation

Calculate destination point

Description

Takes a data-Point and calculates the location of a destination point given a distance in degrees, radians, miles, or kilometers; and bearing in degrees. Uses the Haversine formula to account for global curvature.

Usage

lawn_destination(start, distance, bearing, units, lint = FALSE)

Arguments

`start`	starting point `data-Point`
`distance`	distance from the starting point
`bearing`	ranging from -180 to 180
`units`	miles, kilometers, degrees, or radians
`lint`	(logical) Lint or not. Uses geojsonhint. Takes up increasing time as the object to get linted increases in size, so probably use by default for small objects, but not for large if you know they are good geojson objects. Default: `FALSE`

Value

destination data-Point

Examples

pt <- '{
  "type": "Feature",
  "properties": {
    "marker-color": "#0f0"
  },
  "geometry": {
    "type": "Point",
    "coordinates": [-75.343, 39.984]
  }
}'
lawn_destination(pt, 50, 90, "miles")
lawn_destination(pt, 100, 90, "miles")
lawn_destination(pt, 2, 45, "kilometers")
lawn_destination(pt, 2, 30, "degrees")