HERE_isoline: Get polygon line drawing output from HERE.com
In mike-decarlo/gcd: Great Circle Distance (GCD)

HERE_isoline is designed to take an origin lat-lon and range constraint and return a data.frame with polygon isoline coordinates for making polygon map shapes.

HERE_isoline(
  origin = NULL,
  app_api = NULL,
  app_id = NULL,
  app_code = NULL,
  coord_type = "deg",
  mode_type = "fastest",
  mode_tran = "car",
  mode_traf = "disabled",
  range_type = "distance",
  range_unit = "mi",
  range_val = NULL,
  dev = FALSE,
  verbose = FALSE
)

`origin`	a vector of length two (2); the latitude and longitude coordinates of the origin location
`app_api`	a string; the user's API Key Credentials for the HERE.com JavaScript/REST (requires registration)
`app_id`	a string; the user's App ID for the HERE.com JavaScript/REST (requires registration)
`app_code`	a string; the user's App Code for the HERE.com JavaScript/REST (requires registration)
`coord_type`	a string; if the geocoordinates are in degrees or radians: `"rad"` (radians) `"deg"` (degrees)
`mode_type`	a string; a method of deciding optimal travel route: `"fastest"` `"shortest"`
`mode_tran`	a string; a transportation method for the route: `"car"` `"carHOV"` `"pedestrian"` `"truck"` `"bicycle"`
`mode_traf`	a string; whether or not to factor in traffic: `"disabled"` `"enabled"`
`range_type`	a string; what range constraint the user desires to use: `"distance"` `"time"`
`range_unit`	a string; the units the provided range are given in: `"mi"` `"ft"` `"km"` `"m"` `"hrs"` `"min"` `"sec"`
`range_val`	a numeric; the value of the range constraint
`dev`	a boolean; whether to use development or production site
`verbose`	a boolean; `TRUE` to display json webaddress, `FALSE` to not display json webaddress