JSON import/export format

DB-All.e can import and export streams of messages encoded in JSON format. Since such streams of messages could be potentially very long, and benefit from being processed as they are streamed, streams are composed of one self-contained JSON per line.

Each JSON line contains an Object with these keywords:

• version (String): version of the JSON structure used for messages. For now this is always "0.1".

• network (String): report name (see Report)

• ident (String or null): station identifier (see Station) for mobile stations, or null for fixed stations

• lon (Number): station longitude

• lat (Number): station latitude

• date (String): date and time, always in UTC, in the format YYYY-MM-DDTHH:MM:SSZ. Because of some flexibility in the date parser, a space can be accepted instead of T, and the trailing Z can be omitted. When generating JSON for DB-All.e, please always use the format YYYY-MM-DDTHH:MM:SSZ.

• data (Array of Objects): list of variables in the message.

Each data variable is an Object with these keywords:

• level (Array of 4 x (Number or null)): the 4 values indicating the level or layer for a group of variables. See Level or layer. When parsing, an array shorter than 4 elements is considered null-padded. level is missing for station values (see Station values).

• timerange (Array of 3 x (Number or null)): the 3 values indicating the time range for a group of variables. See Time range. When parsing, an array shorter than 3 elements is considered null-padded. timerange is missing for station values (see Station values).

• vars (Object): station variables, or variables at this level/layer and time range.

The vars Object contains an entry per variable, whose key is the Bxxyyy variable code (see Variable code (varcode)). Each entry is in turn an Object with these keywords:

• v (String or Number or null): variable value. For values with decimal scaling (like B12101), the number is written properly scaled and with the correct number of decimal digits. Trailing zeroes after the decimal dot are not written, and missing trailing decimal digits are assumed to be zero.

• a: (Object): attributes for the variable (see Attributes). If the variable has no attributes, the a key can be omitted. The attributes object is a mapping of Bxxyyy variable codes to variable values as Strings, Numbers, or nulls, as with the v values.

Example JSON message

This is the BUFR file extra/bufr/gts-synop-linate.bufr exported to JSON and indented for readability:

{
  "version": "0.1",
  "network": "synop",
  "ident": null,
  "lon": 927833,
  "lat": 4544944,
  "date": "2015-05-27T06:00:00Z",
  "data": [
    {
      "vars": {
        "B01001": { "v": 16 },
        "B01002": { "v": 80 },
        "B01019": { "v": "MILANO/LINATE" },
        "B02001": { "v": 1 },
        "B02002": { "v": 12 },
        "B04001": { "v": 2015 },
        "B04002": { "v": 5 },
        "B04003": { "v": 27 },
        "B04004": { "v": 6 },
        "B04005": { "v": 0 },
        "B05001": { "v": 45.44944 },
        "B06001": { "v": 9.27833 },
        "B07030": { "v": 108 },
        "B07031": { "v": 103 }
      }
    },
    {
      "timerange": [ 1, 0, 43200 ],
      "level": [ 1, null, null, null ],
      "vars": {
        "B13011": { "v": 4, "a": { "B07032": 2 } }
      }
    },
    {
      "timerange": [ 1, 0, 86400 ],
      "level": [ 1, null, null, null ],
      "vars": {
        "B13011": { "v": 4.4, "a": { "B07032": 2 } }
      }
    },
    {
      "timerange": [ 3, 0, 43200 ],
      "level": [ 1, null, null, null ],
      "vars": {
        "B12101": { "v": 284.75, "a": { "B07032": 2 } }
      }
    },
    {
      "timerange": [ 4, 0, 10800 ],
      "level": [ 1, null, null, null ],
      "vars": {
        "B10060": { "v": 150, "a": { "B07031": 103 } }
      }
    },
    {
      "timerange": [ 205, 0, 10800 ],
      "level": [ 1, null, null, null ],
      "vars": {
        "B10063": { "v": 3, "a": { "B07031": 103 } }
      }
    },
    {
      "timerange": [ 254, 0, 0 ],
      "level": [ 1, null, null, null ],
      "vars": {
        "B10004": { "v": 100310, "a": { "B07031": 103 } },
        "B20001": { "v": 20000, "a": { "B07032": 2 } },
        "B20003": { "v": 508 },
        "B20062": { "v": 1 }
      }
    },
    {
      "timerange": [ 254, 0, 0 ],
      "level": [ 101, null, null, null ],
      "vars": {
        "B10051": { "v": 101530, "a": { "B07031": 103 } }
      }
    },
    {
      "timerange": [ 254, 0, 0 ],
      "level": [ 103, 2000, null, null ],
      "vars": {
        "B12101": { "v": 289.85 },
        "B12103": { "v": 286.45 }
      }
    },
    {
      "timerange": [ 254, 0, 0 ],
      "level": [ 103, 10000, null, null ],
      "vars": {
        "B11001": { "v": 220 },
        "B11002": { "v": 1 }
      }
    },
    {
      "timerange": [ 254, 0, 0 ],
      "level": [ 256, null, 258, 0 ],
      "vars": {
        "B08002": { "v": 7 },
        "B20011": { "v": 1 },
        "B20013": { "v": 1750 }
      }
    },
    {
      "timerange": [ 254, 0, 0 ],
      "level": [ 256, null, 258, 1 ],
      "vars": {
        "B20012": { "v": 34 }
      }
    },
    {
      "timerange": [ 254, 0, 0 ],
      "level": [ 256, null, 258, 2 ],
      "vars": {
        "B20012": { "v": 20 }
      }
    },
    {
      "timerange": [ 254, 0, 0 ],
      "level": [ 256, null, 258, 3 ],
      "vars": {
        "B20012": { "v": 10 }
      }
    },
    {
      "timerange": [ 254, 0, 0 ],
      "level": [ 256, null, 259, 1 ],
      "vars": {
        "B08002": { "v": 1 },
        "B20011": { "v": 1 },
        "B20012": { "v": 6 },
        "B20013": { "v": 1500 }
      }
    },
    {
      "timerange": [ 254, 0, 0 ],
      "level": [ 256, null, null, null ],
      "vars": {
        "B20010": { "v": 12 }
      }
    }
  ]
}