Pre-Imaging QA Skill

To validate UV coverage and phaseshift accuracy before radio astronomy imaging, run a pre-imaging quality assurance check on your calibrated Measurement Set to evaluate baseline metrics and verify alignment to the median meridian.

Checking phaseshifting to the median meridian in a Measurement Set is required because correct phaseshift validation ensures accurate imaging and prevents directional errors during the subsequent radio astronomy synthesis processes.

To assess UV coverage metrics for radio astronomy data, use a validation script that analyzes the Measurement Set to calculate the score, baseline count, and maximum or minimum baseline values against defined quality thresholds.

Pre-imaging quality assurance does generate diagnostic plots for UV coverage density, providing visualizations that allow for manual inspection of baseline distribution and the identification of potential anomalies before imaging.

The limitation of running pre-imaging QA on radio astronomy Measurement Sets is that it only evaluates phaseshift and UV coverage metrics, meaning it cannot correct bad data or replace the actual imaging and deconvolution processes.