Takes a LineString and returns a Point at a specified distance along the line.

Usage

geo_along(line, distance, units)

Arguments

line: (character) a Feature<LineString>
distance: (numeric) distance along the line
units: (character) can be degrees, radians, miles, or kilometers (default)

Value

Feature<Point> distance (at X units) along the line

Examples

line <- '{
  "type": "Feature",
  "properties": {},
  "geometry": {
    "type": "LineString",
    "coordinates": [
      [-77.031669, 38.878605],
      [-77.029609, 38.881946],
      [-77.020339, 38.884084],
      [-77.025661, 38.885821],
      [-77.021884, 38.889563],
      [-77.019824, 38.892368]
    ]
  }
}'

geo_along(line, 10, 'kilometers')
#> [1] "{\"geometry\":{\"coordinates\":[-77.019824,38.892368],\"type\":\"Point\"},\"properties\":{},\"type\":\"Feature\"}"