A regular-grid value with the nodes a renormalizing query interpolated around.
value is vertical TEC in TECU from
Sidereon.GNSS.Ionosphere.TecGrid.vtec_at_pierce_point/5, the pair
{vtec_tecu, stec_tecu} from Sidereon.GNSS.Ionosphere.TecGrid.tec_xyz/6,
and the group delay in meters from
Sidereon.GNSS.Ionosphere.TecGrid.iono_delay_xyz/7.
degraded is a Sidereon.GNSS.Ionosphere.NodeGap naming every weighted node
that held no value, or nil where they all held one. A value with
degraded set rests on fewer nodes than the cell has.
Summary
Types
@type t() :: %Sidereon.GNSS.Ionosphere.TecGrid.Evaluation{ degraded: Sidereon.GNSS.Ionosphere.NodeGap.t() | nil, value: float() | {float(), float()} }