# `Sidereon.GNSS.Ionosphere.TecSample`
[🔗](https://github.com/neilberkman/sidereon-ex/blob/main/lib/sidereon/gnss/ionosphere/tec_sample.ex#L1)

One IONEX vertical-TEC grid-node sample.

The epoch is a split Julian date with a time-scale tag. Latitude and longitude
are in degrees, vertical TEC and optional RMS are in TECU.

# `epoch`

```elixir
@type epoch() :: %{time_scale: String.t(), jd_whole: float(), jd_fraction: float()}
```

Epoch as `%{time_scale:, jd_whole:, jd_fraction:}`.

# `t`

```elixir
@type t() :: %Sidereon.GNSS.Ionosphere.TecSample{
  epoch: epoch(),
  lat_deg: float(),
  lon_deg: float(),
  rms_tecu: float() | nil,
  vtec_tecu: float()
}
```

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*Consult [api-reference.md](api-reference.md) for complete listing*