| Date: | 2001-01-29 19:20:00 | |
| Sender: | ILRS CB/Erricos Pavlis, Van Husson, Carey Noll <Carey Noll <noll@CDDIS.GSFC.NASA.GOV>> | |
| Subject: | [SLR-Mail] No. 727: New SLR Eccentricity File at CDDIS | |
| Author: | ILRS CB | |
| Content: | ******************************************************************************** SLR Electronic Mail 2001-01-29 19:20:00 UTC Message No. 727 ******************************************************************************** Author: ILRS CB/Erricos Pavlis, Van Husson, Carey Noll Subject: New SLR Eccentricity File at CDDIS To ILRS data/products users: Following the recommendations of the last ILRS Analysis Working Group Workshop at Matera, Italy, November 9-10, 2000, the ILRS has updated and extended the ”ILRS Site Eccentricity Report” file that is available electronically via the ILRS Webpage: ftp://cddisa.gsfc.nasa.gov/pub/slrocc/slrecc.txt The new file is in a slightly different format: (a) to allow large eccentricity values amounting up to several kilometers, (b) to include the Cartesian eccentricities corresponding to the local vectors, (c) to include all known DOMES numbers for the SLR sites. The new report was based on a dynamic file that is maintained by Erricos C. Pavlis which is formed at approximately 3-month intervals based on the ITRF ”Site Directory” file (iers_dir.sta Release: 00 12 28). The report contains a new set of Cartesian eccentricity vectors that was computed on the basis of the reported North-East-Up vectors. In the process of doing these computations, it was revealed that the old Cartesian eccentricities for TLRS and MTLRS occupations were in most cases reported in the ”opposite” direction from that which is normally adopted within the CDDIS data base. This is reflected in these cases by the opposite signs between the old and the new Cartesian Dx, Dy, and Dz. In all cases, the N-E-U eccentricities are assumed to be the authoritative values. If you need to use Cartesian vectors, please make use of this new set of values which have consistent reckoning of the direction throughout the report. In addition to these modifications to the eccentricity file, the SLR occupation listing file ftp://cddisa.gsfc.nasa.gov/pub/slrocc/slrocc.txt has been updated to include the DOMES number. In case you have any questions or you would like to report an error or correction, please send a message to Carey Noll: noll@cddis.gsfc.nasa.gov The ILRS CB From: Carey Noll ******************************************************************************** |