{
  "_id": "015086",
  "classname": "Physical/chemical constituents",
  "classno": "15",
  "datawidthbits": "16",
  "name": "GNSS hydrostatic mapping function (see Note 19)",
  "note": "(19) A mapping function is an empirical projection of the zenith delay onto the path delay: Path delay = mapping function  zenith delay. It is a dimensionless real number greater than or equal to one. Different mapping functions are used for the wet and hydrostatic contributions to the delay and for the GNSS gradients.",
  "refvalue": "0",
  "scale": "3",
  "status": "Operational",
  "unit": "Numeric"
}