Opened 16 years ago
Closed 16 years ago
#49 closed enhancement (fixed)
updated header keywords
| Reported by: | MatthewWhiting | Owned by: | MatthewWhiting |
|---|---|---|---|
| Priority: | major | Component: | pvoconvert: FITS access |
| Version: | Keywords: | ||
| Cc: |
Description
A list of FITS header keywords that need to be updated -- from RM:
For the rewrite, can you you please use v3.4 attached.
Main header:
NRCVR = 2
OBSBW = 32.0
OBSNCHAN = 256
COORD_MD = “J2000”
History table
SCALE = “UNCAL”
POL_TYPE = “AA+BB”
NSUB = the number of rows in the (completed) table.
NPOL = 1
CHAN_BW = 0.125
Subint table:
SCALE = “UNCAL”
POL_TYPE = “AA+BB”
NBIN_PRD = 1
NSUBOFFS = 0
NCHAN = 256 (replaces NCH_FILE)
CHAN_BW = -0.125
NCHNOFFS = 0 (replaces NCH_STRT)
NSBLK It might be good to increase this by a factor of 8 or maybe 16 to reduce the overhead of the subint header. At present the headers are about 10% of the data volume. A possible reason for not doing this is that you would generally have to pad the final row. Ideally this would be done with ones and zeros in alternate frequency channels for all pad samples.
DAT_FREQ. These should increase from 420.0625 as discussed above.
This has been taken care of.
The converted FITS files now work with the updated FITS template.