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First we list the some general data system requirements. These are
probably already included in the infrastructure development for CE data in
AIPS++ and required for VLBI.
- the data system file format(s) should be accessible from all
supported machines without conversion
- simultaneous sub-netting should be supported
- coordinate handling must be very general and allow different
coordinate systems and ephemeris information to be carried along
- support for data with non-regular increments in coordinate axes
is required (e.g. non linear velocity axis)
- near field imaging should be supported
- it will be necessary to merge data sets
- support for data errors should be fundamental to the data
system, providing a basis for support of data error handling in a
variety of applications:
- easy generation of error models
- error propagation through a series of tasks
- error images associated with astronomical images
- plotting error bars on spectra and profiles
- automatic warning if contour levels are below noise
- error-based blanking in display of results
- properly formatted errors when data are extracted for tabulation
- a processing history should be maintained for each data set that
can be reviewed by the astronomer, using an easy to use
browser, which allows sorting and editing
- the user should have access to both data values and the
``header'' values that govern the interpretation of the data.
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2004-08-28