{
 "generated_utc": "2026-07-28T17:28:27Z",
 "gfs_cycle_utc": "2026-07-28T12:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 494.5,
  "output_interval_min": 30,
  "integration_step_s": 900,
  "wind_field_interval_h": 3
 },
 "staleness": {
  "fresh_seed_max_h": 24.0,
  "served_until_h": 336.0,
  "track_max_age_h": 72.0,
  "region_spread_deg": 60.0,
  "note": "A trajectory is served for 336 h after the last real fix and then the flight disappears. That matches the archive's own bridging limit: 23% of flights go quiet for over a week and are then heard again, so a shorter window drops balloons that are still flying. Past dead_reckoned flights the balloon has not been heard from since seed_time, so its present position is a prediction too -- the silent period is reconstructed from GFS analyses of weather that has already happened, which is why wind_source distinguishes analysis from forecast. Use display_as, not seed_age_h, to decide how to draw a flight: 'track' means the members still agree and a line is meaningful, 'region' means draw the member envelope instead because the nominal member is no better than any other."
 },
 "members": {
  "offsets_m": [
   -2000,
   -1500,
   -1000,
   -500,
   0,
   500,
   1000,
   1500,
   2000
  ],
  "nominal_offset_m": 0,
  "note": "Each member is seeded at the last observed altitude plus its offset and then conserves the density it started with. The ladder is a sensitivity fan, not a probability distribution: adjacent members diverge by roughly 1,200 km over seven days. levels_spanned reports how many GFS levels the fan actually straddles, usually 2 or 3."
 },
 "files": {
  "trajectories_csv_gz": "PBA_forecast_20260728_12Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260728_12Z.geojson.gz"
 },
 "counts": {
  "flights": 51,
  "members": 9,
  "rows": 264618
 },
 "flights": [
  {
   "callsign": "9A1CTF-16",
   "flight_id": "9A1CTF-16_2026-07-10",
   "payload_type": "WSPR",
   "seed_time": "2026-07-16 23:22:00",
   "seed_lat": 22.83333,
   "seed_lon": 138.79167,
   "seed_alt_m": 12180.0,
   "seed_age_h": 281.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-04 11:45:00",
    "lat": 13.68825,
    "lon": -10.16728,
    "alt_m": 12272.4
   },
   "member_spread_deg": {
    "lat": 93.32,
    "lon": 277.59
   },
   "member_spread_now_deg": {
    "lat": 78.56,
    "lon": 324.24
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "9A1CTF-18",
   "flight_id": "9A1CTF-18_2026-07-10",
   "payload_type": "WSPR",
   "seed_time": "2026-07-16 08:00:00",
   "seed_lat": 26.92359,
   "seed_lon": 141.2035,
   "seed_alt_m": 12930.0,
   "seed_age_h": 297.33,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 11:30:00",
    "lat": 16.11475,
    "lon": -31.71108,
    "alt_m": 13040.9
   },
   "member_spread_deg": {
    "lat": 42.94,
    "lon": 229.81
   },
   "member_spread_now_deg": {
    "lat": 44.45,
    "lon": 222.52
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "AE0SS-9",
   "flight_id": "AE0SS-9_2026-07-12",
   "payload_type": "APRS",
   "seed_time": "2026-07-19 01:40:35",
   "seed_lat": 33.85425,
   "seed_lon": -115.42858,
   "seed_alt_m": 14321.0,
   "seed_age_h": 231.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 11:45:00",
    "lat": 35.5291,
    "lon": -95.9039,
    "alt_m": 14146.0
   },
   "member_spread_deg": {
    "lat": 35.55,
    "lon": 99.0
   },
   "member_spread_now_deg": {
    "lat": 46.02,
    "lon": 44.02
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 12:33:40",
   "seed_lat": -53.39584,
   "seed_lon": 48.16668,
   "seed_alt_m": 12420.0,
   "seed_age_h": 4.77,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 12:00:00",
    "lat": -52.04287,
    "lon": -53.46636,
    "alt_m": 12712.5
   },
   "member_spread_deg": {
    "lat": 16.36,
    "lon": 142.24
   },
   "member_spread_now_deg": {
    "lat": 0.12,
    "lon": 2.76
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-24 17:39:48",
   "seed_lat": 59.97917,
   "seed_lon": 4.08333,
   "seed_alt_m": 13000.0,
   "seed_age_h": 95.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 11:45:00",
    "lat": 60.89796,
    "lon": -130.29307,
    "alt_m": 13137.6
   },
   "member_spread_deg": {
    "lat": 28.12,
    "lon": 329.79
   },
   "member_spread_now_deg": {
    "lat": 21.14,
    "lon": 56.12
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 16:41:18",
   "seed_lat": 51.29167,
   "seed_lon": -11.875,
   "seed_alt_m": 12810.0,
   "seed_age_h": 0.65,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 16:15:00",
    "lat": 55.94333,
    "lon": 120.03959,
    "alt_m": 12922.9
   },
   "member_spread_deg": {
    "lat": 13.64,
    "lon": 119.75
   },
   "member_spread_now_deg": {
    "lat": 0.08,
    "lon": 0.08
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 16:59:18",
   "seed_lat": 50.79167,
   "seed_lon": -97.58333,
   "seed_alt_m": 14140.0,
   "seed_age_h": 0.35,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-04 17:00:00",
    "lat": 22.82797,
    "lon": -44.41821,
    "alt_m": 14560.4
   },
   "member_spread_deg": {
    "lat": 35.25,
    "lon": 219.18
   },
   "member_spread_now_deg": {
    "lat": 0.14,
    "lon": 0.27
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-23",
   "flight_id": "DG2GG-23_2026-05-23",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 02:21:30",
   "seed_lat": 39.95833,
   "seed_lon": -158.58333,
   "seed_alt_m": 12880.0,
   "seed_age_h": 14.98,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 11:45:00",
    "lat": 49.83372,
    "lon": -129.98559,
    "alt_m": 12943.6
   },
   "member_spread_deg": {
    "lat": 23.69,
    "lon": 320.98
   },
   "member_spread_now_deg": {
    "lat": 3.58,
    "lon": 6.18
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-25",
   "flight_id": "DG2GG-25_2026-06-15",
   "payload_type": "WSPR",
   "seed_time": "2026-07-25 07:22:00",
   "seed_lat": 68.97917,
   "seed_lon": 68.16667,
   "seed_alt_m": 12990.0,
   "seed_age_h": 81.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 11:45:00",
    "lat": 70.94333,
    "lon": -83.58833,
    "alt_m": 12945.1
   },
   "member_spread_deg": {
    "lat": 33.14,
    "lon": 203.51
   },
   "member_spread_now_deg": {
    "lat": 17.9,
    "lon": 343.37
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DG2GG-27",
   "flight_id": "DG2GG-27_2026-07-04",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 07:28:00",
   "seed_lat": 55.9375,
   "seed_lon": 130.41667,
   "seed_alt_m": 13230.0,
   "seed_age_h": 9.87,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 11:30:00",
    "lat": 34.25264,
    "lon": 171.71235,
    "alt_m": 13662.0
   },
   "member_spread_deg": {
    "lat": 62.02,
    "lon": 359.09
   },
   "member_spread_now_deg": {
    "lat": 3.97,
    "lon": 1.07
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DJ2DS-34",
   "flight_id": "DJ2DS-34_2026-04-22",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 14:41:00",
   "seed_lat": 30.70833,
   "seed_lon": -70.5,
   "seed_alt_m": 9190.0,
   "seed_age_h": 2.65,
   "float_reliable": false,
   "dead_reckoned": false,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-04 14:15:00",
    "lat": 15.27908,
    "lon": -20.68995,
    "alt_m": 9282.8
   },
   "member_spread_deg": {
    "lat": 49.65,
    "lon": 108.22
   },
   "member_spread_now_deg": {
    "lat": 0.4,
    "lon": 0.1
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DL0MMZ",
   "flight_id": "DL0MMZ_2026-07-24",
   "payload_type": "OTHER",
   "seed_time": "2026-07-25 15:59:04",
   "seed_lat": 36.60802,
   "seed_lon": 30.46457,
   "seed_alt_m": 8441.0,
   "seed_age_h": 73.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-04 11:30:00",
    "lat": 35.44768,
    "lon": -159.39907,
    "alt_m": 8656.3
   },
   "member_spread_deg": {
    "lat": 47.26,
    "lon": 347.32
   },
   "member_spread_now_deg": {
    "lat": 24.96,
    "lon": 11.13
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "DL0MZ-493",
   "flight_id": "DL0MZ-493_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 16:06:01",
   "seed_lat": 49.625,
   "seed_lon": 25.08333,
   "seed_alt_m": 12400.0,
   "seed_age_h": 49.23,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-04 11:30:00",
    "lat": 60.22196,
    "lon": -143.2304,
    "alt_m": 12287.7
   },
   "member_spread_deg": {
    "lat": 24.94,
    "lon": 342.68
   },
   "member_spread_now_deg": {
    "lat": 5.32,
    "lon": 16.46
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DL0MZ-493e",
   "flight_id": "DL0MZ-493e_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 16:06:02",
   "seed_lat": 49.63134,
   "seed_lon": 25.11007,
   "seed_alt_m": 12400.0,
   "seed_age_h": 49.23,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-04 11:30:00",
    "lat": 61.27886,
    "lon": -140.25648,
    "alt_m": 12332.0
   },
   "member_spread_deg": {
    "lat": 33.79,
    "lon": 347.35
   },
   "member_spread_now_deg": {
    "lat": 5.0,
    "lon": 16.24
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 16:53:00",
   "seed_lat": 58.0625,
   "seed_lon": -39.0,
   "seed_alt_m": 12460.0,
   "seed_age_h": 0.45,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 17:00:00",
    "lat": 73.58102,
    "lon": -140.65559,
    "alt_m": 12635.6
   },
   "member_spread_deg": {
    "lat": 16.94,
    "lon": 237.91
   },
   "member_spread_now_deg": {
    "lat": 0.17,
    "lon": 0.1
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DO3GU-40",
   "flight_id": "DO3GU-40_2026-06-19",
   "payload_type": "WSPR",
   "seed_time": "2026-07-24 12:15:47",
   "seed_lat": 71.20833,
   "seed_lon": 93.16667,
   "seed_alt_m": 15164.0,
   "seed_age_h": 101.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 11:45:00",
    "lat": 89.72462,
    "lon": 124.76913,
    "alt_m": 14642.1
   },
   "member_spread_deg": {
    "lat": 46.93,
    "lon": 296.33
   },
   "member_spread_now_deg": {
    "lat": 8.32,
    "lon": 317.79
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 08:23:00",
   "seed_lat": 66.16667,
   "seed_lon": 33.04167,
   "seed_alt_m": 12700.0,
   "seed_age_h": 8.95,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 11:30:00",
    "lat": 52.3784,
    "lon": -125.06452,
    "alt_m": 13204.1
   },
   "member_spread_deg": {
    "lat": 19.17,
    "lon": 85.9
   },
   "member_spread_now_deg": {
    "lat": 1.11,
    "lon": 0.82
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EOSSP-2",
   "flight_id": "EOSSP-2_2026-02-01",
   "payload_type": "WSPR",
   "seed_time": "2026-07-14 21:21:33",
   "seed_lat": 42.27078,
   "seed_lon": 149.50001,
   "seed_alt_m": 14180.0,
   "seed_age_h": 331.98,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 11:45:00",
    "lat": 31.28816,
    "lon": -83.08744,
    "alt_m": 14561.2
   },
   "member_spread_deg": {
    "lat": 57.38,
    "lon": 342.53
   },
   "member_spread_now_deg": {
    "lat": 60.94,
    "lon": 225.46
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "K0PEA-28",
   "flight_id": "K0PEA-28_2026-01-07",
   "payload_type": "WSPR",
   "seed_time": "2026-07-23 12:15:25",
   "seed_lat": 49.85411,
   "seed_lon": 24.91668,
   "seed_alt_m": 13360.0,
   "seed_age_h": 125.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 11:45:00",
    "lat": 59.26644,
    "lon": 152.29405,
    "alt_m": 13494.7
   },
   "member_spread_deg": {
    "lat": 30.75,
    "lon": 341.08
   },
   "member_spread_now_deg": {
    "lat": 19.8,
    "lon": 274.08
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "K5NOT-11",
   "flight_id": "K5NOT-11_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 16:55:37",
   "seed_lat": 48.83328,
   "seed_lon": -47.375,
   "seed_alt_m": 13120.0,
   "seed_age_h": 0.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 17:00:00",
    "lat": 42.11078,
    "lon": 102.77947,
    "alt_m": 13053.8
   },
   "member_spread_deg": {
    "lat": 41.41,
    "lon": 167.03
   },
   "member_spread_now_deg": {
    "lat": 0.1,
    "lon": 0.73
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "K9YO-23",
   "flight_id": "K9YO-23_2026-07-13",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 06:25:49",
   "seed_lat": 52.5833,
   "seed_lon": 125.16663,
   "seed_alt_m": 12840.0,
   "seed_age_h": 34.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 11:30:00",
    "lat": -17.57189,
    "lon": 89.38787,
    "alt_m": 13191.3
   },
   "member_spread_deg": {
    "lat": 61.02,
    "lon": 157.41
   },
   "member_spread_now_deg": {
    "lat": 7.06,
    "lon": 19.31
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KC3LBR-422-10",
   "flight_id": "KC3LBR-422-10_2026-01-02",
   "payload_type": "WSPR",
   "seed_time": "2026-07-19 21:57:02",
   "seed_lat": -26.39583,
   "seed_lon": -68.16667,
   "seed_alt_m": 14380.0,
   "seed_age_h": 211.38,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 11:30:00",
    "lat": -30.71218,
    "lon": 76.73901,
    "alt_m": 14328.4
   },
   "member_spread_deg": {
    "lat": 35.42,
    "lon": 255.6
   },
   "member_spread_now_deg": {
    "lat": 11.27,
    "lon": 308.13
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC3LBR-449",
   "flight_id": "KC3LBR-449_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 16:57:03",
   "seed_lat": 74.79167,
   "seed_lon": 139.08333,
   "seed_alt_m": 13100.0,
   "seed_age_h": 0.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 17:00:00",
    "lat": 65.16288,
    "lon": -83.87672,
    "alt_m": 13303.4
   },
   "member_spread_deg": {
    "lat": 28.29,
    "lon": 210.65
   },
   "member_spread_now_deg": {
    "lat": 0.1,
    "lon": 0.1
   },
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   },
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  },
  {
   "callsign": "ZS6SRC-37",
   "flight_id": "ZS6SRC-37_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-07-14 23:39:00",
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   "seed_lon": -136.75,
   "seed_alt_m": 11580.0,
   "seed_age_h": 329.68,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
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    "lon": -49.7749,
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   },
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   },
   "member_spread_now_deg": {
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   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "ZS6SRC-84",
   "flight_id": "ZS6SRC-84_2026-07-12",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 15:20:00",
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   "seed_lon": 8.375,
   "seed_alt_m": 13090.0,
   "seed_age_h": 26.0,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 11:45:00",
    "lat": -19.70292,
    "lon": -158.57712,
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   "member_spread_deg": {
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   },
   "member_spread_now_deg": {
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   "display_as": "track",
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  },
  {
   "callsign": "ZS6ZU-11",
   "flight_id": "ZS6ZU-11_2026-07-17",
   "payload_type": "WSPR",
   "seed_time": "2026-07-20 01:53:00",
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   "seed_lon": -151.29167,
   "seed_alt_m": 13360.0,
   "seed_age_h": 207.45,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
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    "lat": -35.38928,
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   "member_spread_deg": {
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   "member_spread_now_deg": {
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    "lon": 112.82
   },
   "display_as": "region",
   "display_reason": "member_spread"
  }
 ]
}