Dynamic augmentation of ionospheric correction data

An apparatus comprising processing circuitry and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the processing circuitry, cause the apparatus at least to:

• receive, from a requesting device, a request for grid layout data, wherein the grid layout data is associated with one or more geographical areas experiencing at least some atmospheric delay incurred with a satellite-based positioning technique;
• transmit, in response to the request for the grid layout data, a grid layout definition message, wherein the grid layout definition message comprises a grid layout definition associated with the grid layout data associated with the one or more geographical areas, wherein the grid layout data of the grid layout definition message comprises data associated with one or more individual grids, and wherein the one or more individual grids comprise one or more correction data points associated with one or more specific locations within the one or more geographical areas;
• generate correction data based in part on the grid layout data, wherein the correction data is configured to correct the at least some atmospheric delay incurred with the satellite-based positioning technique, by applying a polynomial model to the one or more correction data points of the one or more individual grids, wherein the polynomial model applied is selected based at least in part on a residual threshold and the data size of the polynomial model;
• generate one or more correction messages, wherein the one or more correction messages comprise at least a portion of the correction data;
• determine a dynamic correction data update rate, wherein the dynamic correction data update rate and size of the one or more correction messages is based in part on an ionospheric activity model;
• and
• transmit, to the requesting device, the one or more correction messages based on the dynamic correction data update rate.