The Library of Medium Resolution Spectra

| HyperLeda home | Documentation | Search by name | Search near a position | Define a sample | SQL Search |

Structure of the archive

1. The library is divided into different archive corresponding to the different datasets. Each of these archives are maintained on a disk attached to a machine connected to internet. They are stored as tar files.
2. The updating procedure of HyperLeda check every day the date of these files, and upload those recently modified. The frames are then checked for its conformity and re-packed into a archives available for distribution to the mirrors
3. The mirror asynchroneously update themselves to this source

2. At present, the disk storage requested to start with this project (we will archive 1000 files of 1Mo) is:

Function	Machine	Volume
Developpement of the archive	galaxies or cumulus	1+1 Go
Inclusion in HyperLeda	galaxies	1+1 Go
Mirror on cumulus	cumulus	1 Go

3. The files are stored in the gzipped FITS format. The filenames are chosen to be unique.
The archive will be divided in subdirectories in order to avoid problems with some unix commands which have a limitation in the size of the argument or number of files.

The directory name codes the dataset
The file name is the file number in this dataset

L	Identifiy the archive block (L for Lyon) dataset
YY	Calendar year for the dataset
MM	Ordinal number of a calendar month
i	Identification of the dataset in the observing run (1 digit)
OB	Code for the observatory (eg. HP for Observatoire de Haute-Provence
j	Number describing the telescope used
nnnn	Identification number of the file, the fits.gz extension is omitted when referencing the frames in HyperLeda, but is exists

                    93111OHP1/
                  /
                 /
    archive_root -- 95071ESO1/ 
                 \
                  \
                    98031OHP2/