{
  "_id": "4.5",
  "name": "Code table 4.5 - Fixed surface types and units",
  "values": [
    {
      "codeentry": "Reserved",
      "codefigure": "0",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": ""
    },
    {
      "codeentry": "Ground or water surface",
      "codefigure": "1",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Cloud base level",
      "codefigure": "2",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Level of cloud tops",
      "codefigure": "3",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Level of 0 \u00b0C isotherm",
      "codefigure": "4",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Level of adiabatic condensation lifted from the surface",
      "codefigure": "5",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Maximum wind level",
      "codefigure": "6",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Tropopause",
      "codefigure": "7",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Nominal top of the atmosphere",
      "codefigure": "8",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Sea bottom",
      "codefigure": "9",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Entire atmosphere",
      "codefigure": "10",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Cumulonimbus (CB) base",
      "codefigure": "11",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "m"
    },
    {
      "codeentry": "Cumulonimbus (CB) top",
      "codefigure": "12",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "m"
    },
    {
      "codeentry": "Lowest level where vertically integrated cloud cover exceeds the specified percentage (cloud base for a given percentage cloud cover)",
      "codefigure": "13",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "%"
    },
    {
      "codeentry": "Level of free convection (LFC)",
      "codefigure": "14",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Convective condensation level (CCL)",
      "codefigure": "15",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Level of neutral buoyancy or equilibrium level (LNB)",
      "codefigure": "16",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Departure level of the most unstable parcel of air (MUDL)",
      "codefigure": "17",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Departure level of a mixed layer parcel of air with specified layer depth",
      "codefigure": "18",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "Pa"
    },
    {
      "codeentry": "Lowest level where cloud cover exceeds the specified percentage",
      "codefigure": "19",
      "flag_value": "",
      "note": "(see Note 9)",
      "status": "Operational",
      "unit": "%"
    },
    {
      "codeentry": "Isothermal level",
      "codefigure": "20",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "K"
    },
    {
      "codeentry": "Lowest level where mass density exceeds the specified value (base for a given threshold of mass density)",
      "codefigure": "21",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "kg m-3"
    },
    {
      "codeentry": "Highest level where mass density exceeds the specified value (top for a given threshold of mass density)",
      "codefigure": "22",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "kg m-3"
    },
    {
      "codeentry": "Lowest level where air concentration exceeds the specified value (base for a given threshold of air concentration)",
      "codefigure": "23",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "Bq m-3"
    },
    {
      "codeentry": "Highest level where air concentration exceeds the specified value (top for a given threshold of air concentration)",
      "codefigure": "24",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "Bq m-3"
    },
    {
      "codeentry": "Highest level where radar reflectivity exceeds the specified value (echo top for a given threshold of reflectivity)",
      "codefigure": "25",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "dBZ"
    },
    {
      "codeentry": "Convective cloud layer base",
      "codefigure": "26",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "m"
    },
    {
      "codeentry": "Convective cloud layer top",
      "codefigure": "27",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "m"
    },
    {
      "codeentry": "Effective inflow layer base",
      "codefigure": "28",
      "flag_value": "",
      "note": "(see Note 11)",
      "status": "Operational",
      "unit": ""
    },
    {
      "codeentry": "Effective inflow layer top",
      "codefigure": "29",
      "flag_value": "",
      "note": "(see Note 11)",
      "status": "Operational",
      "unit": ""
    },
    {
      "codeentry": "Specified radius from the centre of the Sun",
      "codefigure": "30",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "m"
    },
    {
      "codeentry": "Solar photosphere",
      "codefigure": "31",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": ""
    },
    {
      "codeentry": "Ionospheric D-region level",
      "codefigure": "32",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": ""
    },
    {
      "codeentry": "Ionospheric E-region level",
      "codefigure": "33",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": ""
    },
    {
      "codeentry": "Ionospheric F1-region level",
      "codefigure": "34",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": ""
    },
    {
      "codeentry": "Ionospheric F2-region level",
      "codefigure": "35",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": ""
    },
    {
      "codeentry": "Stratopause",
      "codefigure": "36",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": ""
    },
    {
      "codeentry": "Hygropause",
      "codefigure": "37",
      "flag_value": "",
      "note": "(see Note 12)",
      "status": "Operational",
      "unit": ""
    },
    {
      "codeentry": "Reserved",
      "codefigure": "38-99",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": ""
    },
    {
      "codeentry": "Isobaric surface",
      "codefigure": "100",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "Pa"
    },
    {
      "codeentry": "Mean sea level",
      "codefigure": "101",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": ""
    },
    {
      "codeentry": "Specific altitude above mean sea level",
      "codefigure": "102",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "m"
    },
    {
      "codeentry": "Specified height level above ground",
      "codefigure": "103",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "m"
    },
    {
      "codeentry": "Sigma level",
      "codefigure": "104",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "\"sigma\" value"
    },
    {
      "codeentry": "Hybrid level",
      "codefigure": "105",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Depth below land surface",
      "codefigure": "106",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "m"
    },
    {
      "codeentry": "Isentropic (theta) level",
      "codefigure": "107",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "K"
    },
    {
      "codeentry": "Level at specified pressure difference from ground to level",
      "codefigure": "108",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "Pa"
    },
    {
      "codeentry": "Potential vorticity surface",
      "codefigure": "109",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "K m2 kg-1 s-1"
    },
    {
      "codeentry": "Reserved",
      "codefigure": "110",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": ""
    },
    {
      "codeentry": "Eta level",
      "codefigure": "111",
      "flag_value": "",
      "note": "(see Note 1)",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Reserved",
      "codefigure": "112",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": ""
    },
    {
      "codeentry": "Logarithmic hybrid level",
      "codefigure": "113",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": ""
    },
    {
      "codeentry": "Snow level",
      "codefigure": "114",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "Numeric"
    },
    {
      "codeentry": "Sigma height level",
      "codefigure": "115",
      "flag_value": "",
      "note": "(see Note 4)",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Reserved",
      "codefigure": "116",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": ""
    },
    {
      "codeentry": "Mixed layer depth",
      "codefigure": "117",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "m"
    },
    {
      "codeentry": "Hybrid height level",
      "codefigure": "118",
      "flag_value": "",
      "note": "(see Note 2)",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Hybrid pressure level",
      "codefigure": "119",
      "flag_value": "",
      "note": "(see Note 3)",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Reserved",
      "codefigure": "120-149",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": ""
    },
    {
      "codeentry": "Generalized vertical height coordinate",
      "codefigure": "150",
      "flag_value": "",
      "note": "(see Note 5)",
      "status": "Operational",
      "unit": ""
    },
    {
      "codeentry": "Soil level",
      "codefigure": "151",
      "flag_value": "",
      "note": "(see Note 6)",
      "status": "Operational",
      "unit": "Numeric"
    },
    {
      "codeentry": "Sea-ice level",
      "codefigure": "152",
      "flag_value": "",
      "note": "(see Note 8)",
      "status": "Operational",
      "unit": "Numeric"
    },
    {
      "codeentry": "Reserved",
      "codefigure": "153-159",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": ""
    },
    {
      "codeentry": "Depth below sea level",
      "codefigure": "160",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "m"
    },
    {
      "codeentry": "Depth below water surface",
      "codefigure": "161",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "m"
    },
    {
      "codeentry": "Lake or river bottom",
      "codefigure": "162",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Bottom of sediment layer",
      "codefigure": "163",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Bottom of thermally active sediment layer",
      "codefigure": "164",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Bottom of sediment layer penetrated by thermal wave",
      "codefigure": "165",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Mixing layer",
      "codefigure": "166",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Bottom of root zone",
      "codefigure": "167",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Ocean model level",
      "codefigure": "168",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "Numeric"
    },
    {
      "codeentry": "Ocean level defined by water density (sigma-theta) difference from near-surface to level",
      "codefigure": "169",
      "flag_value": "",
      "note": "(see Note 7)",
      "status": "Operational",
      "unit": "kg m-3"
    },
    {
      "codeentry": "Ocean level defined by water potential temperature difference from near-surface to level",
      "codefigure": "170",
      "flag_value": "",
      "note": "(see Note 7)",
      "status": "Operational",
      "unit": "K"
    },
    {
      "codeentry": "Ocean level defined by vertical eddy diffusivity difference from near-surface to level",
      "codefigure": "171",
      "flag_value": "",
      "note": "(see Note 7)",
      "status": "Operational",
      "unit": "m2 s-1"
    },
    {
      "codeentry": "Ocean level defined by water density (rho) difference from near-surface to level",
      "codefigure": "172",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "m"
    },
    {
      "codeentry": "Top of snow over sea ice on sea, lake or river",
      "codefigure": "173",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Top surface of ice on sea, lake or river",
      "codefigure": "174",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Top surface of ice, under snow cover, on sea, lake or river",
      "codefigure": "175",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Bottom surface (underside) ice on sea, lake or river",
      "codefigure": "176",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Deep soil (of indefinite depth)",
      "codefigure": "177",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Reserved",
      "codefigure": "178",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Top surface of glacier ice and inland ice",
      "codefigure": "179",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Deep inland or glacier ice (of indefinite depth)",
      "codefigure": "180",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Grid tile land fraction as a model surface",
      "codefigure": "181",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Grid tile water fraction as a model surface",
      "codefigure": "182",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Grid tile ice fraction on sea, lake or river as a model surface",
      "codefigure": "183",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Grid tile glacier ice and inland ice fraction as a model surface",
      "codefigure": "184",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Roof level",
      "codefigure": "185",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Wall level",
      "codefigure": "186",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Road level",
      "codefigure": "187",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Melt pond top surface",
      "codefigure": "188",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Melt pond bottom surface",
      "codefigure": "189",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Reserved",
      "codefigure": "190",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": ""
    },
    {
      "codeentry": "Abstract level with no vertical localization",
      "codefigure": "191",
      "flag_value": "",
      "note": "(see Note 10)",
      "status": "Operational",
      "unit": "-"
    },
    {
      "codeentry": "Reserved for local use",
      "codefigure": "192-254",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": ""
    },
    {
      "codeentry": "Missing",
      "codefigure": "255",
      "flag_value": "",
      "note": "",
      "status": "Operational",
      "unit": ""
    }
  ]
}