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[fitsbits] INSTRUME and TELESCOP
On Wed 2009-05-06T15:27:04 -0400, Bob Garwood hath writ:
The few successful attempts I'm aware of typically involve steps like "I know this SDFITS file came from aips++, so I need to do this to that field to make sense of it." It would be ideal if those types of steps wouldn't be necessary. Alas, in many cases the initial requirements on keyword values were somewhat lax (if they existed at all). The only way to make that not necessary is to fight the battles of adding bits to the standard. In order to avoid utter confusion that usually requires adding new, previously unused keywords to the standard in order to require that they may only have values with specific, precise characteristics. This is the battle that is in progress right now for the time-related keywords of FITS WCS paper 5. It is particularly tricky to deal with keywords that relate to star/end/duration of an observation or exposure. There are many keywords already in use by various agencies with various meanings. "All the good names are already taken", so the paper is suggesting things like XPOSURE. I'll close with this repeated plea that everyone from radio to gamma ray look at the keywords related to exposure times in the draft of FITS WCS 5 http://hea-www.harvard.edu/~arots/TimeWCS/ and reply to the fitswcs list. -- Steve Allen WGS-84 (GPS) UCO/Lick Observatory Natural Sciences II, Room 165 Lat +36.99855 University of California Voice: +1 831 459 3046 Lng -122.06015 Santa Cruz, CA 95064 http://www.ucolick.org/~sla/ Hgt +250 m |
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