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Functional requirements
The end-user shall access the archive via the internet and Graphical User
Interfaces. Pixel data shall be supplied
with astrometric WCS, flux calibrated pixels, and confidence maps which
include bad pixel flags/masks; object catalogues shall be merged across
avaliable passbands and shall include error estimates for subsets of the
more important parameters.
The end-user shall be offered:
- pixel data in any available passband over small areas of order up to
a few tens of arcmin (TBD) with associated matched object catalogue
- larger areas from survey data, mosaiced on-the-fly and blocked
down as required/appropriate
- optimally stacked images where survey data are available
- seamless, merged multi-colour, multi-parameter catalogues with best
available astrometric and photometric calibration from survey data
- ability to specify the object parameters in the user-extracted subset
from survey data
- survey database federation with other source catalogues (primarily
SDSS and Schmidt photographic sky surveys)
- ability to construct readily meaningful optical/IR colours
for all sources, not just point sources, in the overlap with the SDSS
- ability to carry out efficient queries to locate objects
conditional on ranges of the following parameters: spherical co-ordinates
in equatorial/Galactic systems; radius within given sky position; JHK
magnitudes and any linear combination thereof; object size; object
classification (stellar/non-stellar/other)
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- ability to carry out queries on any other stored parameter
- for all queries, archive shall be able to return an
estimate of the number of objects to be located and time required to
implement the search (not only for user information, but also to help
archive management, scheduling of queries, etc.)
- ability to carry out queries on recalibrated quantities or previous
versions of calibrations
- ability to perform repeated queries (`batch' mode) on
survey data
- ability to create simple finder chart (for use while observing for
example)
- ability to access `best', or all of a set of duplicate measurements
where they exist in overlapping survey data (eg. generate light curves
and/or proper motions from duplicate measurements of the same object)
- general access to housekeeping data - eg. what's currently available;
how good is it; in short, user access to all housekeeping data specified in
the previous section
Next: Technical requirements
Up: SCIENCE ARCHIVE REQUIREMENTS
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Nigel Hambly
2002-10-02