Observation Collection Interaction

Once you have created an ObservationCollection, whether from simulated or real data, you will often need to access, modify, and process the observations. This section covers the various operations you can perform on observation collections:

• Extracting information: Learn how to retrieve observation data, times, residuals, and metadata

• Modifying collections: Set weights, define reference points, and compute residuals

• Using dependent variables: Add and retrieve auxiliary quantities calculated alongside observations

• Processing observations: Filter, split, and remove observation sets

These tools allow you to prepare your observation data for estimation, analyze results, and ensure data quality.

Attention

In Tudat, we distinguish between “filtering” and “parsing” the observation collection. “Filtering” selects a subset of the observation collection based on the observation value, its timetag and residual, while “parsing” acts on the metadata of the observation set (observable type, link ends, ancillary settings). For more information, see the user guide on observation collection filtering and observation collection parsing.