{
 "parameters": {"design_speed_kmh": 50, "design_grade": 0.06},
 "groups": [
  {
   "nodes": [
    {"lonlat": [-123.13097, 49.27397], "z_m": 11.0, "source": "example", "method": "chosen"},
    {"lonlat": [-123.1363, 49.27045], "z_m": 21.8, "source": "example", "method": "chosen"},
    {"lonlat": [-123.13785, 49.26922], "z_m": 11.1, "source": "example", "method": "chosen"},
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    {"lonlat": [-123.13834, 49.26843], "z_m": 5.3, "source": "example", "method": "chosen"}
   ]
  }
 ]
}