Here, x is either j, f or n for the three filters and YYY is the plate number.
The plate blocks are downloaded from HPSS (until the fast connection is down, plate blocks are assumed to be under the directory xYYY), vignetting corrected and sewed together. The header of the resulting file, xYYY.fits, is altered to include WCS information.
The sewing itself is done as follows:
take all 13 blocks from a row,
write first row (1024 pixels) of each block
write second row (1024 pixels) of each block
write last row (1024 pixels) of each block
go to the next row ...
The header is obtained from skicat (xYYY_Header), keywords
are added using the ftools task fmodhead. Finally, the equinox is made 2000.0 and the header included in the fits file.
Last Outdated: 14 Nov 2000