SLRF2005

The terrestrial reference frame was obtained combining ITRF2000, ITRF2005 rescaled and a global SLR solution with data from 1993 to 2007 to add the new sites. SLRF2005 will be a temporary reference frame until a new ILRS frame, obtained from the official SSC/EOP product, will be available. It takes the best from ITRF2000 and ITRF2005 and is a unique representation of all the SLR sites.

Download via ftp the SINEX file of the SLRF2005 stations positions.

SLRF2005 computational strategy

In ITRF2005 there are some stations with very large sigmas (more or less 500 meters on coordinates and 50 m/y on velocities) causing instabilities in the matrix. Those stations have been deleted from the file before the combination. Most of them are not big players in the ITRF and they will be added as soon as there is a good estimation. The table below contains the list of those sites. Some of them are well estimated in ITRF2000. In red are reported the stations not being in the combination of ITRF2000 and ITRF2005.

+SOLUTION/EPOCHS

*Code	PT	SOLN	T	Data_start	Data_end	Mean_epoch	comment
7122	A	1	C	92:364:20108	93:010:41381	93:004:30953	ok in ITRF2000
7123	A	1	C	93:112:25806	93:310:42948	93:211:34377	ok in ITRF2000
7883	A	1	C	93:335:28394	94:042:64147	94:006:46271	ok in ITRF2000
7882	A	1	C	94:075:53242	94:130:15383	94:102:77512	ok in ITRF2000
7411	A	1	C	94:193:04556	94:258:43738	94:225:67347	ok in ITRF2000
7525	A	1	C	94:199:13073	94:279:84021	94:239:48547	ok in ITRF2000
7520	A	1	C	95:238:65872	95:260:74471	95:249:70172	ok in ITRF2000
7847	A	1	C	96:098:46968	96:105:50693	96:102:05631	bad also in ITRF2000
7307	B	1	C	97:253:56118	97:298:62932	97:276:16325	not in ITRF2000, discarded
7307	D	1	C	99:260:46043	99:288:43839	99:274:44941	not in ITRF2000, discarded
7355	A	1	C	01:119:62133	01:145:75983	01:132:69058	not in ITRF2000, discarded
7830	A	1	C	03:097:70658	03:290:51783	03:194:18021	not in ITRF2000, discarded
7357	A	1	C	03:217:45220	03:290:67834	03:254:13327	not in ITRF2000, discarded
7823	A	1	C	04:172:04739	04:178:01370	04:175:03054	not in ITRF2000, discarded
7130	A	1	C	05:213:45454	05:307:03282	05:260:24368	not in ITRF2000, discarded
7358	A	1	C	05:214:30940	05:333:72723	05:274:08632	not in ITRF2000

New stations

Together with the sites having bad values in ITRF2005, a set of new stations have been added to SLRF2005: San Juan (7406), Haleakala (7119), Shanghai (7821). A global solution has been done by ASI using the data from 1993 to 2007. It is a loose solutions with SSC/SSV estimated at epoch 1997.0. Before combination, the variance/covariance matrix has been downweighted by a factor of 100. ASI.93-07 was downweighted and a subnetwork of "core sites"+"new sites" was extracted from the solution to be combined with the other 2 TRF with the aim to minimize its influence over the network.

The complete list of sites taken from the global ASI solution is: