Date: Thu, 4 Jan 2007 12:42:56 +0100 (CET) From: gend@gfz-potsdam.de To: IGSmail Subject: [IGSMAIL-5522]: New formats for combination summary files (.sum, .cls) Message-ID: Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-igsmail Precedence: bulk ****************************************************************************** IGS Electronic Mail 04 Jan 03:43:02 PST 2007 Message Number 5522 ****************************************************************************** Author: Gerd Gendt Dear colleagues, The IGS will change the formats of its combination summary files at the end of January 2007. The related file names are igswwwwd.sum and igswwwwd.cls. The units in all tables will be changed to millimeter, micro-arcsec, pico-second In addition the files *.cls will have changes in the columns of the first table and will have in addition a table where the detected AC's clock jumps are reported. For a better handling of future changes a version number was introduced (Version 2.0). If you have any automated reading of those files implemented, please, prepare for the changes. Attached are examples for the new formts. Best regards Gerd Gendt ******************************************************************************** igswwwwd.sum ******************************************************************************** Author: AC Coordinator / GFZ Potsdam sum-file Version 2.0 Final IGS Orbit Combination - Week 1403 (Nov 26, 2006 - Dec 02, 2006) Contacts: G. Gendt (gendt@gfz-potsdam.de), Th. Nischan ( nisn@gfz-potsdam.de) COMBINATION STRATEGY: --------------------- ... 8. Small rotations were applied to the all AC orbit and ERP values in order to align them to the IGS05. These rotations were estimated in the process of the IGS SINEX combination, performed at NRCan by Remi Ferland, are based on the common stations between the individual AC SINEX solutions and the IGS05.snx SINEX. The estimated 7 transformations, from which only the 3 rotations are applied to the orbit and ERP values, are: | DX DY DZ RX RY RZ SCL Centre | [mm] [mm] [mm] [uas] [uas] [uas] [ppb] -------+--------------------------------------------------- COD | 0.1 0.3 0.1 -0 -10 10 .04 EMR | 0.1 1.5 5.6 -20 -30 -40 .13 ESA | 0.3 0.2 0.9 10 -40 20 -.70 GFZ | 0.3 -0.1 0.6 -10 -10 0 -.33 JPL | 4.0 7.3 9.7 200 -80 250 .46 MIT | 6.5 1.3 9.5 -10 0 0 .27 NGS | 3.9 1.6 -6.8 30 -90 20 -.86 SIO | 12.5 2.3 4.6 40 -250 130 .33 ... ORBIT COMBINATION AND EVALUATION STATISTICS: -------------------------------------------- Most combination statistics are with respect to the combined orbits and consist of five parts. The first, Table 1, summarizes all statistics for the week. It contains means and standard deviations over the week of satellite ephemeris and clock correction transformation parameters for each centre (table 1.1403.a). It also displays the computed satellite position sigmas for the combined orbits (table 1.1403.b). The second part, Table 2, contains the complete ephemeris and clock correction transformation parameters (includes both the apriori and a posteriori values) for each centre and each day (tables 2.1403.[0-6]). The third part, Table 3, contains two types of daily RMS for each satellite and centre, along with the computed satellite position sigmas for the combined orbits (tables 3.1403.[0-6]). The first type of satellite RMS is based on orbit combination and the second RMS type is a result of the 7-day arc evaluation of each centre ephemerides. The fourth part, Table 4, is a weekly summary of the daily precise navigation summaries for centres providing both orbit and clock solutions. It contains weekly station RMS w.r.t. the initial coordinates for the Latitude, Longitude and Height components for up to three IGS stations (table 4.1307). The fifth and final part, Table 5, is similar to Table 4 and contains daily precise navigation statistics (tables 5.1403.0-6). In tables 1-3, the most important statistic which is meaningful for intra centre/satellite analysis is labeled WRMS. It is a weighted RMS where normalized weights are based on accuracy codes given in the SP3 files, and should not be affected by downweighted/problem satellites when acknowledged by individual centres in their SP3 file. Table 1: Week 1403 summary. (Nov 26, 2006 - Dec 02, 2006) Table 1.1403.a GPS week: 1403 MJD: 54065.000-54071.000 Mean and standard deviations of transformation parameters to the combined IGS orbit. WRMS - orbit RMS weighted by the SP3 header accuracy codes. STA - Mean number of stations in the daily solutions. CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS| TOFT TDRFT SDEV RMS | [mm] [mm] [mm] [uas] [uas] [uas] [ppb] [mm] [mm]| [ps] [ps/d] [ps] [ps] --------+- ----------- --------------------------------------+------------------------------ cod 174| 2 2 2 10 -50 -70 -.20 21 21 | -700 1000 040 090 | 1 1 1 10 10 30 .00 | 1400 2400 emr 51| -2 -2 -2 40 -40 10 .20 21 21 | -64900 -300 30 100 | 1 1 1 10 10 20 .00 | 2300 2100 esa 76| 4 4 4 10 -30 30 .20 21 21 | 26000 2500 50 150 | 2 2 2 30 30 30 .10 | 61800 6600 xxx xxx|-9999 -9999 -9999 -9999 -9999 -9999 -9.99 9999 9999 |-1234999 -123999 123999 123999 .. Table 1.1403.b GPS week : 1403 MJD: 54065.000-54071.000 Satellite position sigmas for the combined orbits (coded in the IGS SP3 orbit files). "E" flags eclipsing satellites. Units: mm. Day of GPS week PRN | 0 1 2 3 4 5 6 | Remarks ------+------------------------------------+------------------------------------------ 1 | 10 10 10 10 10 10 10 | 2E | 10 10 10 10 10 10 10 | 3 | 10 10 10 10 10 10 10 | 4E | 10 10 10 10 10 10 10 | 5 | 10 10 10 10 10 10 10 | 6 | 10 10 10 10 10 10 10 | 7 | 10 10 10 10 10 10 10 | 8 | 10 10 10 10 10 10 10 | 9 | 10 10 10 10 10 10 10 | 10 | 10 10 10 10 10 10 10 | 11E | 10 10 10 10 10 10 10 | 12 | 20 30 30 30 30 40 20 | 13 | 10 10 10 10 10 10 10 | 14 | 10 10 10 10 10 10 10 | 15E | 10 10 10 20 20 10 10 | 16 | 10 10 10 10 10 10 10 | 17 | 10 10 10 10 10 10 10 | 18 | 10 10 10 10 10 10 10 | 19 | 10 10 10 10 10 10 10 | 20 | 10 10 10 10 10 10 10 | 21E | 10 10 10 10 10 10 10 | 22 | 10 10 10 10 10 10 10 | 23 | 10 10 10 10 10 10 10 | 24E | 10 10 10 10 10 10 10 | 25E | 10 10 10 10 10 10 10 | 26 | 10 10 10 10 10 10 10 | 27 | 10 10 10 10 10 10 10 | 28 | 10 10 10 10 10 10 10 | 29 | 10 10 10 10 10 10 20 | 30 | 10 10 10 10 10 10 10 | 31 | 10 10 10 10 10 10 10 | 32 | ---- ---- ---- ---- ---- ---- 0 | Table 2: Daily transformation of each centre to the combined IGS orbit and clocks for each day of the week. The transformation displayed is the sum of a priori and estimated transformations. WRMS - RMS weighted by the centres SP3 header accuracy codes. STA - Number of stations in the daily solutions. Units: microarcsec, ppb, millimeter, pico-sec, pico-sec/day. Table 2.1403.0 GPS week: 1403 Day: 0 MJD: 54065.000 CENT STA| DX DY DZ RX RY RZ SCL RMS WRMS| TOFT TDRFT SDEV RMS | [mm] [mm] [mm] [uas] [uas] [uas] [ppb] [mm] [mm]| [ps] [ps/d] [ps] [ps] --------+------------------------------------------------+---------------------------------- cod 174| 2 2 2 10 -50 -70 -.20 21 21 | -700 1000 40 90 | 1 1 1 10 10 30 .00 | 1400 2400 emr 51| -2 -2 -2 40 -40 10 .20 21 21 | -64900 -300 30 100 | 1 1 1 10 10 20 .00 | 2300 2100 esa 76| 4 4 4 10 -30 30 .20 21 21 | 26000 2500 50 150 | 2 2 2 30 30 30 .10 | 61800 6600 Table 2.1403.1 GPS week: 1403 Day: 1 MJD: 54066.000 ... Table 3: Daily fit for each satellite and each centre resulting from weighted average combination and from long arc orbit dynamics (7-day). The first IGS column gives resulting satellite accuracy measures found in SP3 header. The last IGS column gives the RMS fit of the IGS orbit when processed through the 7-day arc evaluation. "E" stands for eclipsing satellites (earth). "M" stands for eclipsing satellites (moon). "X" stands for excluded from the statistics but included in IGS orbit. "T" stands for Total long arc orbit RMS for all satellites. "NE" stands for long arc orbit RMS for Non-Eclipsing satellites only. "MEDI" stands for median of the centre's satellite RMS. "MD" Units: mm. Table 3.1403.0 GPS week: 1403 Day: 0 MJD: 54065.000 Weighted Average Orbit Dynamics (7 days) PRN | cod emr esa gfz igr jpl mit ngs sio IGS | cod emr esa gfz igr jpl mit ngs sio IGS ------+--------------------------------------------------+--------------------------------------------------- 1 | 10 10 20 10 10 10 10 30 20 10 | 20 30 40 30 30 30 30 30 20 30 2E | 10 20 20 40 10 50 30 20 30 10 | 30 30 40 50 30 30 30 30 30 30 X3 | 10 10 20 10 10 ---- 20 10 30 10 | 30 30 30 30 30 ---- 30 30 30 30 4E | 20 20 20 20 10 20 30 30 30 10 | 60 60 60 60 60 60 60 50 60 60 ... ------+--------------------------------------------------+--------------------------------------------------- RMS | 20 20 20 20 10 40 20 20 30 |T 40 40 40 40 40 50 40 40 40 40 WRMS | 20 20 20 20 10 40 20 20 30 |NE 30 40 40 40 40 50 40 40 30 40 MEDI | 20 20 20 10 10 20 20 20 30 |MD 30 40 40 40 30 40 30 30 30 30 Table 3.1403.1 GPS week: 1403 Day: 1 MJD: 54066.000 ... Table 4: Precise Navigation Summary. Weekly station RMS w.r.t. the estimated coordinates for the Latitude, Longitude and Height components. See Table 5 for the daily summary. CLK - Satellite clocks used. EPO - Mean number of satellite clock epochs available in the daily solutions. Units: mm. Table 4.1403 GPS week: 1403 MJD: 54065.0-54071.0 CENT| CLK EPO | BRUS | TOW2 | WILL | ----+----------+-------------------+-------------------+-------------------+ cod | cod 2981 |U 20 20 40 |U 20 30 50 |U 20 20 30 | emr | emr 2854 | 20 20 40 |U 20 30 50 | 10 20 30 | esa | esa 2783 | 20 30 60 |U 20 30 40 | 20 20 40 | gfz | gfz 2937 |U 20 20 40 |U 20 30 50 |U 20 20 30 | igr | igr 2922 | 20 30 50 | 20 30 50 | 20 20 40 | igs | igs 2952 | 20 20 40 | 20 30 50 | 20 20 30 | jpl | jpl 2888 | 20 30 50 | 20 30 50 | 20 20 40 | mit | mit 2976 |U 20 20 40 |U 20 30 50 |U 20 20 30 | Table 5: Daily Precise Navigation Summary using the corresponding Centre orbit positions and satellite clock corrections at 15 min intervals. Each line gives the daily station RMS w.r.t. the estimated coordinates for the Latitude, Longitude and Height components. CLK - Satellite clocks used. EPO - Number of satellite clock epochs available for that day. Units: mm. Table 5.1403.0 GPS week: 1403 Day: 0 MJD: 54065.0 CENT| CLK EPO | BRUS | TOW2 | WILL | ----+----------+-------------------+-------------------+-------------------+ cod | cod 2974 | 20 20 20 | 10 30 50 | 20 20 40 | emr | emr 2776 | 10 20 40 | 20 40 60 | 20 20 40 | esa | esa 2784 | 20 20 40 | 20 30 50 | 20 20 50 | gfz | gfz 2952 | 20 20 30 | 20 30 50 | 10 30 40 | igr | igr 2929 | 20 30 40 | 20 30 60 | 20 20 40 | igs | igs 2974 | 20 20 40 | 20 40 50 | 10 30 30 | jpl | jpl 2862 | 30 30 60 | 30 40 60 | 20 30 40 | mit | mit 2976 | 10 20 40 | 20 40 70 | 10 20 30 | Table 5.1403.1 GPS week: 1403 Day: 1 MJD: 54066.0 ... Table 6: Earth Orientation Parameters weekly summary. Weekly mean and standard deviation of Centre ERP, ERP rates and LOD differences with respect to IGS combined values. See Table 7 for the daily summaries. AC LOD BIAS: 21-day mean LOD bias with respect to Bulletin A AC LOD BIAS RMS: RMS of AC LOD BIAS FLAG: "u" (used), "x" (excluded), "-" (no submission) for Xpole, Ypole, Xrt, Yrt and LOD Table 6.1403 GPS week: 1403 MJD: 54065.500-54071.500 AC LOD AC LOD CENT FLAG | Xpole Ypole Xrt Yrt LOD | BIAS BIAS RMS | [uas] [uas] [uas/d] [uas/d] [us]| [us] [us] ------------+----------------------------------------+------------------ cod uuuuu | 10 -20 -30 -10 0 | 2 16 | 20 20 70 60 2 | 1 emr uuuuu | -10 -10 40 -70 12 | 24 30 | 20 20 70 100 9 | 1 esa uuuuu | -50 30 -60 -10 4 | 30 38 | 20 50 60 110 14 | 3 gfz uuuuu | 50 10 -20 80 -3 | -3 16 | 10 20 50 50 6 | 5 igr xxxxx | 20 10 20 10 -4 | 4 18 | 10 20 70 60 6 | 5 irf xxxxx | 00 20 -30 00 -2 | -2 17 | 10 10 50 30 8 | 4 jpl uuuux | 20 -20 50 30 16 | -3 21 | 20 20 150 130 24 | 2 mit uuuuu | -10 -20 -20 00 -11 | 33 38 | 10 40 100 70 17 | 7 ngs uuuxu | -50 90 80 -110 -6 | 27 33 | 30 60 170 250 22 | 3 sio xuuux | 190 -80 -30 00 -18 | 23 31 | 10 10 80 50 14 | 7 Table 7.1403.0 GPS week: 1403 Day: 0 MJD: 54065.500 ... ******************************************************************************** igswwwwd.cls ******************************************************************************** cls-file Version 2.0 GPS week: 1403 Day: 0 MJD: 54065 RESULTS OF FINAL WEIGHTED COMBINATION ------------------------------------- CEN | NREPO NBEPO NRCLK NRBAD OFFSET DRIFT CLKSDV SDVSAT SDVSTA CLKRMS RMSSAT RMSSTA WEIGHT | (ps) (ps/d) (ps) (ps) (ps) (ps) (ps) (ps) (%) ----+-------------------------------------------------------------------------------------------- cod | 288 0 35593 1004 -1070 1710 40 65 24 90 110 90 17.34 emr | 288 0 26494 79 -60910 -4110 30 48 22 100 110 90 20.59 esa | 288 0 24473 819 4450 -2740 50 63 39 150 150 150 11.65 gfz | 288 0 45075 107 0270 -0610 30 43 22 110 150 90 24.13 igr | 288 0 30852 87 -14210 -2290 30 35 23 80 80 80 0.00 jpl | 288 0 28323 2222 3670 -2370 50 72 30 160 150 160 12.81 mit | 288 0 38469 1811 -0130 0710 50 79 30 120 150 120 13.47 ngs | 96 0 2974 52 -0070 -0250 2320 2319 0 4820 4820 0 0.00 sio | 0 0 0 0 0 0 0 0 0 0 0 0 0.00 | MEAN (ps) OF AC CLOCK COMPARED TO COMBINATION | cod emr esa gfz igr jpl mit ngs sio | -----+-------------------------------------------------------+ 1 | 33 -142 16 86 47 109 -96 -480 - | 2 | -80 45 14 68 31 -13 -84 -949 - | 3 | -9 -62 -74 71 16 - 44 3396 - | 4 | X 19 X -117 -43 52 132 -6870 - | 5 | -77 51 -34 94 27 -83 -38 -4074 - | 6 | -13 -20 146 -30 -31 -81 53 -2399 - | 7 | -25 12 -135 193 37 -122 -99 -2077 - | 8 | -25 -110 130 75 46 26 -69 285 - | 9 | -16 0 -19 10 -74 2 16 -4755 - | ... 24 | -13 -93 97 57 -7 X -28 -4717 - | 25 | -38 -73 81 -46 22 76 100 946 - | 26 | -12 -36 74 -119 -67 82 140 30 - | 27 | -46 -173 256 84 63 37 -83 -6653 - | 28 | -73 49 125 -24 22 16 -78 5329 - | 29 | -4 29 - -89 -53 32 90 -3384 - | 30 | -10 20 140 -174 -83 143 36 -7089 - | 31 | 251 16 207 -493 15 X 167 568 - | -----+-------------------------------------------------------+ ALBH | - -33 - -84 - - 202 - - | ALGO | -42 56 -36 -58 46 96 13 - - | ALIC | 62 - - -44 -3 76 -75 - - | ALRT | -47 - - 16 - - 31 - - | AMC2 | -37 174 -41 -69 -3 - -59 - - | AREQ | - -99 - -96 -138 -86 405 - - | ARTU | - - X -69 23 130 X - - | ASPA | - - - 135 - -254 - - - | AUCK | -243 - - 249 -13 - -133 - - | BAHR | -82 -42 - 70 16 47 X - - | BAKO | - - - 0 - - -1 - - | BILI | - - 58 - - -53 - - - | BJFS | -79 - - -5 - 216 -95 - - | BOGT | 25 - - 23 -33 6 -79 - - | BOR1 | 3 - - -3 19 - - - - | ... YSSK | -84 - - 66 - - -9 - - | ZAMB | - - - 99 - -187 - - - | ZIMM | 34 - - -24 - - - - - | ZWE2 | 1 - - 0 14 - - - - | -----+-------------------------------------------------------+ | RMS (ps) OF AC CLOCK COMPARED TO COMBINATION | cod emr esa gfz igr jpl mit ngs sio | NEPO RMS (ps) -----+-------------------------------------------------------+-------------- 1 | 74 59 66 38 28 53 66 4716 - | 288 3630 2 | 42 51 53 47 41 112 98 525 - | 288 0220 3 | 35 33 47 38 25 - 56 3278 - | 288 1220 4 | X 38 X 47 45 44 92 1997 - | 285 1020 5 | 20 29 36 33 26 43 78 613 - | 288 0890 6 | 23 25 52 28 25 30 41 1986 - | 288 0510 7 | 29 28 40 21 30 26 38 940 - | 288 0710 8 | 55 44 82 20 30 33 57 2763 - | 288 1470 9 | 91 66 90 43 44 43 85 3541 - | 288 3010 10 | 57 38 100 31 19 55 70 4314 - | 288 2660 ... 24 | 97 71 94 40 74 X 107 2355 - | 288 2070 25 | 85 60 59 48 27 49 84 2901 - | 288 0860 26 | 71 57 57 27 35 55 87 1440 - | 288 0470 27 | 42 43 72 26 29 42 58 3125 - | 288 2580 28 | 43 41 61 21 20 75 130 953 - | 288 0220 29 | 59 51 - 14 44 57 80 907 - | 288 1350 30 | 23 27 45 28 22 38 45 4017 - | 288 2210 31 | 52 58 52 52 44 X 70 614 - | 288 027 -----+-------------------------------------------------------+-------------- ALBH | - 14 - 7 - - 20 - - | 252 4410 ALGO | 20 11 29 13 15 18 21 - - | 288 0030 ALIC | 18 - - 14 13 30 15 - - | 288 9780 ALRT | 17 - - 8 - - 15 - - | 288 7540 AMC2 | 24 20 19 15 11 - 14 - - | 288 0030 AREQ | - 24 - 18 29 85 79 - - | 211 14490 ARTU | - - X 39 46 73 X - - | 176 11900 ASPA | - - - 22 - 41 - - - | 288 >>> AUCK | 16 - - 23 39 - 36 - - | 288 5440 BAHR | 16 14 - 13 18 17 X - - | 288 0840 BAKO | - - - 38 - - 68 - - | 288 4280 BILI | - - 27 - - 25 - - - | 213 >>> BJFS | 22 - - 11 - 16 17 - - | 286 10130 BOGT | 16 - - 10 21 14 19 - - | 288 12170 ... 0 ZAMB | - - - 12 - 22 - - - | 288 41970 ZIMM | 13 - - 9 - - - - - | 288 3870 ZWE2 | 21 - - 15 17 - - - - | 285 9890 -----+-------------------------------------------------------+-------------- TOT | 38 33 49 28 27 45 45 2319 - | CLOCK JUMP CORRECTIONS APPLIED ------------------------------ CEN | STA/SAT | EPOCH | JUMP(psec) ----+---------+-----------------+------------- cod | YELL | 1403-0 7:00:00 | -1207 cod | FAIR | 1403-0 14:05:00 | 2853 cod | NYA1 | 1403-0 21:00:00 | 2128 emr | CHUR | 1403-0 6:45:00 | -601 emr | NPLD | 1403-0 10:05:00 | 7400272 esa | POTS | 1403-0 1:40:00 | 663 esa | THTI | 1403-0 5:05:00 | -972 esa | DRAO | 1403-0 6:30:00 | 1632 esa | ARTU | 1403-0 11:15:00 | -627 esa | ARTU | 1403-0 16:55:00 | 603 esa | ARTU | 1403-0 17:20:00 | -719 gfz | -ref- | 1403-0 5:00:00 | -932 jpl | DWH1 | 1403-0 14:25:00 | 1959 jpl | 24 | 1403-0 19:45:00 | 585 mit | AREQ | 1403-0 17:10:00 | -874 mit | SYOG | 1403-0 21:00:00 | -2431 -ref-: flag for ref clock jump --------------------------------------------------------------------------- --------------------------------------------------------------------------- RESULTS OF TIME SCALE COMBINATION: | STABILITY RESULTS FROM IGS CLOCK ENSEMBLE | NFRQ NEPO MEAN | ALLAN DEVIATION AT TAU = | | NREPO NBEPO BRKS USED WGT(%) | 300s 3600s 21600s | ------+-----------------------------------+------------------------------+ AMC2 | 288 0 0 288 9.95 | 3.04e-14 4.95e-15 1.91e-15 | USNO | 288 1 0 287 9.91 | 3.15e-14 3.78e-15 2.67e-15 | WAB2 | 288 0 0 288 7.75 | 3.32e-14 5.38e-15 1.70e-15 | USN3 | 288 0 0 288 7.61 | 4.28e-14 1.25e-14 4.54e-15 | NISU | 288 0 0 288 6.46 | 4.60e-14 7.38e-15 1.33e-15 | BRUS | 288 0 0 288 6.16 | 3.87e-14 6.28e-15 2.43e-15 | NLIB | 288 0 0 288 6.14 | 3.66e-14 6.98e-15 1.30e-15 | ALGO | 288 1 0 287 6.11 | 2.82e-14 7.43e-15 5.40e-15 | OPMT | 287 0 0 286 5.55 | 4.59e-14 6.39e-15 2.05e-15 | SPT0 | 288 0 0 288 5.52 | 4.65e-14 8.58e-15 3.08e-15 | ONSA | 288 0 0 288 4.92 | 4.85e-14 1.12e-14 3.46e-15 | WES2 | 288 0 0 288 2.69 | 3.80e-14 7.63e-15 1.83e-15 | BREW | 288 0 0 143 2.51 | 5.12e-14 7.14e-15 1.38e-15 | YELL | 288 0 0 288 2.16 | 2.92e-14 4.89e-15 1.12e-15 | ... ALIC | 288 0 0 0 0.00 | - - - | ALBH | 252 0 0 0 0.00 | - - - | ------+-----------------------------------+------------------------------+ STEERS APPLIED TO TIME SCALE: | 3.15e-17 3.78e-16 2.27e-15 | ------------------------------------------+------------------------------+ MOST STABLE CLOCKS: | WSRT USNO YELL | ------------------------------------------+------------------------------+ ****************************************************************************** * Gerd Gendt * * _/_/_/ _/_/_/_/_/_/ GeoForschungsZentrum * * _/ _/ _/ Department Geodesy and Remote Sensing * * _/ _/_/ _/_/ _/ Telegrafenberg A17 * * _/ _/ _/ _/ D-14473 Potsdam , GERMANY * * _/_/_/ _/ _/_/_/ Phone : ++49 331 288 1114 Fax :++49 331 288 1759 * * E-Mail: gendt@gfz-potsdam.de * * IGS GFZ AC : AFTP://ftp.gfz-potsdam.de/pub/igsprod * * http://www.gfz-potsdam.de/igs * * IGS Analysis Coord.: AFTP://ftp.gfz-potsdam.de/pub/igsacc * * http://www.gfz-potsdam.de/igsacc * ******************************************************************************