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Data Display and Editing

Users must be able to display and interact with data in ways which are much more flexible and effective than in AIPS. This has long been regarded as vital to system with few baslines, such as VLBI, but is also likely to prove useful in processing other forms of data. Data display and editing should be seen as generic tools, applicable to single dish and other data as well as interferometer visibilities. To this end, some degree of data visualisation should perhaps be seen as an integral, or at least closely coupled part of the data system.

Many ``viewing strategies'' are desirable for display and interactive flagging of data:

• Baseline by baseline display and editing (including multiple, simultaneous baselines).
• Display of data aggregated in various ways (e.g. averaged over a number of spectral channels).
• Interactive selection of data to be displayed:
  • taking arbitrary cuts (e.g. circular, radial or a user-defined locus) through the uv-plane;
  • setting windows in space and/or time;
  • expanding aggregates (e.g. pointing and clicking on an averaged multi-channel visibility to show the component spectrum).
• Display of generic model data (i.e. from CLEAN components, gaussian fitting etc.) with observed and/or processed data, and display of data with model subtracted or divided.
• Flagging should be reversible, with the ability to store flagging information and apply this on the fly.
• Flagging on the basis of monitor/observing log data.
• Flagging from ``consistency check'' information, in particular redundancy, where possible, or crossing-points in the uv-plane.
• ``Intelligent'' automated flagging for large datasets.