| Date: | 1998-11-16 22:00:00 | |
| Sender: | Carey Noll/CDDIS <[Mailed Carey Noll 301-286-9283 <NOLL@CDDIS.GSFC.NASA.GOV>]> | |
| Subject: | [SLR-Mail] No. 179: New Computer for the CDDIS | |
| Author: | Carey Noll | |
| Content: | ******************************************************************************** SLR Electronic Mail 1998-11-16 22:00:00 UTC Message No. 179 ******************************************************************************** Author: Carey Noll/CDDIS Subject: New Computer for the CDDIS The CDDIS staff is pleased to announce that our SLR data archiving and processing activities will soon be operational on our new UNIX platform, a Digital AlphaServer 4000: Host name: cddisa.gsfc.nasa.gov Host number: 128.183.204.168 Access: anonymous ftp and web All data filenames are in lower case, with the exception of the .Z indicating a compressed file. Below is a directory tree structure for these data. As of December 1, 1998 the host cddisa.gsfc.nasa.gov will be operational. For the next month or two, we will continue to maintain the archive of SLR data on cddis.gsfc.nasa.gov by ftp-ing data from cddisa back to the VAX (host name cddis.gsfc.nasa.gov). Users should, however, transition their software to use the UNIX host as soon as possible. Regards, Carey. ------------------------------------------------------------------------------- SLR Data on the CDDIS The CDDIS provides on-line access to two major types of SLR data: on-site, or field- generated, normal points and full-rate. The CDDIS also provides access to an historic archive of normal points generated from full-rate data. On-Site (Field-Generated) SLR Normal Point Data The on-site normal point data are provided in CSTG format and are archived in daily files, where each file contains all data received for the particular date of the file; therefore one file may contain several days worth of data. These data are available within a day or two of the observation. Furthermore, monthly files (time-sorted and by satellite) are created from these daily files; in this case, however, the monthly file contains all data received and archived for that month. All on-site normal point data (both daily and monthly files) are stored in separate directories by satellite, yearly subdirectories under each of these. The directories are of the form /pub/slrql/satname/yyyy where satname=lageos1, lageos2, starlette, etc. and yyyy is the four digit year. Full-Rate SLR Data In 1996, the SLR/LLR Subcommission of the CSTG recommended discontinuing routine reporting of SLR full-rate data. The CDDIS, however, maintains an archive of historic full-rate data as well as data currently supplied by any contributing stations. Currently, SLR full-rate data available from the CDDIS are in two forms, both in MERIT-II format. Data observed prior to 1995 are in monthly, station-merged, time-sorted files. Data observed after January 1, 1995 are stored in daily files by station and satellite, in subdirectories by satellite and station, and can be found in the directory /pub/slrfr/satname/ssss, where satname is as above, and ssss is the four-digit monument number. SLR full-rate data are provided by the NASA SLR network on a daily basis; data from cooperating sites are provided with a several month delay and are not necessarily provided by all sites generating on-site normal points. The CDDIS staff creates merged monthly files of these daily data as well, on a time-available basis; these monthly files can be found in the directory /pub/slr/slrfr/monthly/yyyy. Normal Point Data Generated from Full-Rate SLR Data The SLR normal point data generated from full-rate SLR data are available for 1988 through 1994; on-site normal points were determined to be of sufficient quality and thus normal points derived from full-rate were discontinued. The historic data continue to be available on-line on the CDDIS in monthly in MERIT-II format, in subdirectories by satellite of the form /slr/slrnpt/satname/yyyy, where satname is as above and yyyy is the four-digit year. Satellite Prediction Files Predicted orbit (tuned inter-range vector, IRV format) files for most of the currently-tracked SLR satellites are available through the CDDIS anonymous ftp site, in the directory /pub/predicts. ------------------------------------------------------------------------------- ILRS DATA CENTER ------------------------------------------------------------------------------- Short Name : CDDIS Institution : Crustal Dynamics Data Information System Function within IKRS : Global Data Center Mail Address : Code 922 NASA GSFC Greenbelt, MD 20771 Contact : Carey Noll Telephone : (301) 286-9283 Fax : (301) 286-0213 E-Mail : noll@cddis.gsfc.nasa.gov Backup Contact : Maurice Dube Backup Telephone : (301) 286-4835 Backup E-Mail : disops@cddis.gsfc.nasa.gov Internet Address : cddisa.gsfc.nasa.gov (128.183.204.168) Telnet Access : None FTP Access : anonymous ftp Other Access Methods : Web Access Restrictions : Computer/Operating System : Digital AlphaServer 4000/Digital UNIX Amount of data on line : many years Access to off-line data : By special arrangements. Media: on-line, magnetic tape (9-track, 4mm) Other Important Information: ------------------------------------------------------------------------------- DIRECTORY STRUCTURE ------------------------------------------------------------------------------- Directory Filenames Description ------------------------------------------------------------------------------- /pub/slr SLR data disk slr/llrnpt/yyyy llr_npt.yymm.Z compressed LLR monthly mini-normal point data file for year ´yy´ and month ´mm´ slr/slrfr/satname/yyyy satname_v.yymm.Z compressed SLR monthly full-rate data file for satellite ´satname´, version ´v´, year ´yy´, and month ´mm´ /daily/ssss compressed SLR full-rate daily data ssss_yymmdd_v.satname.Z data file for station ´ssss´, satellite ´satname´, version ´v´, year ´yy´, month ´mm´, and day ´dd´ slr/slrnpt/satname/yyyy satnamev_npt.yymm.Z compressed SLR monthly normal point data file (generated from full-rate data) for ´satname´, version ´v´, year ´yy´, and month ´mm´ satnamev_npt.yymm_sum SLR monthly normal point data summary file (generated from full-rate data) for ´satname´, version ´v´, year ´yy´, and month ´mm´ slr/slrql/satname/yyyy new_qlyymmdd.satcode daily SLR normal point data file for satellite ´satname´ and ´satcode´, year ´yy´, month ´mm´ and day ´dd´ new_qlyymm.satcode.Z compressed monthly SLR normal point data file for satellite ´satname´ and ´satcode´, year ´yy´, month ´mm´ and day ´dd´ slr/slrql/allsat/yyyy all_qlyymmdd.all daily SLR normal point data file for all satellites, year ´yy´, month ´mm´ and day ´dd´ nasa_qlyymmdd.dat daily SLR normal point data file from NASA stations, for all satellites, year ´yy´, month ´mm´ and day ´dd´ ql_allsat_yymmdd daily SLR normal point data file from EDC, for all satellites, year ´yy´, month ´mm´ and day ´dd´ Updated: 16-Nov-98 [Mailed From: Carey Noll 301-286-9283 ******************************************************************************** |