[IGSREPORT-7801] Wk 1090 EMR Analysis Report
Pierre Tetreault
pierre at geod.nrcan.gc.ca
Thu Dec 7 12:26:47 PST 2000
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IGS Electronic Report 07 Dec 12:26:59 PST 2000 Message Number 7801
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Author: NRCan/GSDivision
********************************************************************************
EMR ANALYSIS REPORT GPS-WEEK 1090 Dates: 00nov26 to 00dec02
********************************************************************************
NRCan (Natural Resources Canada, formerly Energy, Mines and Resources (EMR))
615 Booth Street, Ottawa, Canada K1A 0E9
e-mail: pierre at geod.nrcan.gc.ca, huot at geod.nrcan.gc.ca
tel: (613)992-2218 (Pierre Tetreault)
(613)996-4914 (Caroline Huot)
fax: (613)995-3215
PRODUCTS GENERATED:
The following products are generated and uploaded into CDDIS @ NASA/GSFC
EMR10900-6.SP3 GPS ephem. files for days 0-6, week #1090 in sp3 format
EMR10907.ERP pole x,y and DUT1 solutions for week #1090
EMR10907.SNX station and EOP weekly combined solution in SINEX format
EMR10907.SUM name of this text summary file
REMARKS on EMR products:
1. ALGO receiver clock used as reference time. In the sp3 EPH file sat. clock
correction value of 999999.999999 microseconds indicates that the direct clock
comparison with the reference clock is not available (e.g. ALGO not observing
a satellite).
ALGO clock error & drift were about 2069 ns (51876) & 10 ns/day w.r.t.
GPS time.
2. Date | PRN | Action | Period | Reason
+--------+-------+--------+----------------+----------------------------+
+--------+-------+--------+----------------+----------------------------+
(R) Satellite was removed from EMR SP3 file.
(E) Satellite was excluded prior to processing data.
(M) Satellite in maneuver.
SOLUTION CHARACTERISTICS
1. Solution identifier: Submission 001207
2. Software used : GIPSY/OASIS II (UNIX )
3. Definition of Terrestrial frame:
origin and orientation : Nominally IGS97
reference epoch : current date
GM : 398600.4415 km^3/s^2
gravity model : GEMT3( 8,8) +C21+S21
ocean loading : Pagiatakis, global_model
4. Solution characteristics:
undifferenced phase and smoothed pseudorange data for satellite
elevation > 15 degrees at 7.5 min. normal point interval; single
day (24h) arc with 6 IC and 3 rad. parameters per satellite
5. See IGS Mail#928 (April 05, 1995) and IGS Report#1488 (January 16, 1995)
for more details regarding EMR processing strategy.
CARRIER PHASE / PSEUDO RANGE STATISTICS
Note: F indicates a constrained fiducial site
E indicates an eclipsing satellite
Carrier Phase Statistics
rms (cm) / # obs
00nov26 00nov27 00nov28 00nov29 00nov30 00dec01 00dec02
---------------------------------------------------------------------
ALGO .42/1509 .34/1407 .35/1445 .33/1337 .41/1570 .34/1441 .35/1563
AREQ .44/1458 .00/ 0 .00/ 0 .00/ 0 .50/1426 .45/1693 .48/1430
ARTU .00/ 0 .00/ 0 .00/ 0 .00/ 0 .00/ 0 .40/1558 .46/1524
ASC1 .64/1019 .66/1323 .67/1207 .00/ 0 .00/ 0 .00/ 0 .55/ 963
AUCK .42/1170 .40/1302 .52/1322 .48/1437 .47/1378 .47/1387 .43/1290
BAHR .48/1559 .44/1231 .44/1377 .44/1518 .43/1272 .48/1286 .46/1463
BRMU .44/1292 .46/1246 .65/1235 .55/1262 .65/1333 .46/1376 .39/1272
CAS1 .00/ 0 .00/ 0 .00/ 0 .55/1453 .49/1425 .45/1455 .45/1502
CHAT .47/1300 .45/1076 .47/1311 .54/1415 .52/1327 .00/ 0 .00/ 0
CHUR .43/1174 .39/1024 .37/ 864 .37/ 911 .45/1507 .44/1468 .47/1576
COCO .00/ 0 .00/ 0 .00/ 0 .00/ 0 .00/ 0 .53/ 995 .57/ 832
DRAO .42/1423 .42/1499 .40/1488 .40/1452 .42/1500 .40/1510 .46/1542
EISL .58/ 934 .42/ 963 .52/1045 .55/ 951 .64/1162 .56/1011 .53/1033
FAIR .49/1104 .00/ 0 .43/ 827 .52/ 770 .46/1360 .64/1371 .44/1392
FORT .92/ 591 .00/ 0 .00/ 0 .68/ 567 .51/ 621 .71/ 665 .00/ 0
GUAM .00/ 0 .94/1438 .00/ 0 .00/ 0 .00/ 0 .00/ 0 1.04/1583
HOB2 .00/ 0 .00/ 0 .00/ 0 .00/ 0 .54/1425 .00/ 0 .00/ 0
HRAO .00/ 0 .00/ 0 .69/1623 .00/ 0 .00/ 0 .00/ 0 .00/ 0
IISC .00/ 0 .00/ 0 .00/ 0 .00/ 0 .52/ 905 .53/ 797 .00/ 0
IRKT .00/ 0 .46/1351 .45/1414 .46/1330 .44/1466 .46/1310 .00/ 0
JAB1 .00/ 0 .00/ 0 .00/ 0 .00/ 0 .00/ 0 .47/ 676 .00/ 0
KIT3 .48/1420 .45/1389 .45/1266 .00/ 0 .00/ 0 .00/ 0 .00/ 0
KOUR .68/1519 .00/ 0 .00/ 0 .74/1213 .00/ 0 .00/ 0 .00/ 0
KWJ1 .68/ 865 .55/1025 .65/1101 .00/ 0 .72/ 912 .76/ 690 .75/ 989
LHAS .53/1509 .47/1231 .00/ 0 .53/1199 .00/ 0 .49/1311 .49/1367
MAC1 .00/ 0 .00/ 0 .45/ 999 .41/1136 .39/1210 .51/1201 .40/1325
MALI .00/ 0 .75/ 863 .00/ 0 .00/ 0 .00/ 0 .00/ 0 .74/1057
MATE .57/1438 .54/1567 .48/1497 .48/1514 .41/1420 .45/1397 .00/ 0
MAW1 .47/1368 .44/1398 .42/1367 .42/1463 .48/1432 .43/1572 .39/1587
MCM4 .47/ 904 .49/ 890 .48/ 811 .49/ 969 .00/ 0 .00/ 0 .48/1056
MKEA .60/1437 .56/1541 .60/1544 .63/1518 .64/1453 .58/1284 .64/1386
NLIB .47/1137 .00/ 0 .48/1203 .55/1273 .55/1320 .00/ 0 .00/ 0
NRC1 .44/1237 .41/1158 .34/1490 .32/1384 .39/1531 .32/1573 .31/1570
NRC2 .46/1278 .00/ 0 .30/1433 .33/1428 .39/1528 .32/1516 .31/1571
NYAL .00/ 0 .37/ 895 .41/ 941 .47/1310 .43/1416 .42/1542 .43/1598
ONSA .44/1523 .00/ 0 .41/1423 .45/1532 .47/1570 .49/1570 .55/1541
PERT .65/1405 .00/ 0 .58/1254 .00/ 0 .00/ 0 .00/ 0 .00/ 0
PIE1 .42/ 901 .48/1105 .38/1130 .00/ 0 .46/1148 .42/1283 .38/1244
RIOG .00/ 0 .39/1562 .00/ 0 .00/ 0 .00/ 0 .00/ 0 .00/ 0
SANT .44/1397 .44/1332 .42/1389 .51/1326 .50/1449 .51/1530 .52/1447
SEY1 .83/ 925 .83/ 904 .73/ 933 .58/ 914 .61/ 818 .79/ 778 .83/ 801
STJO .36/1572 .37/1570 .50/1335 .39/1558 .41/1591 .38/1586 .51/1521
SUTH .41/ 555 .00/ 0 .00/ 0 .41/1343 .49/1459 .41/1278 .41/1111
THU1 .69/1187 .69/1227 .55/ 671 .68/1202 .65/1500 .60/1399 .62/1610
TIDB .68/1537 .60/1363 .58/1479 .70/1236 .00/ 0 .00/ 0 .48/1409
TIXI .61/ 847 .42/1299 .40/ 978 .45/1059 .46/1733 .42/1605 .49/1700
TSKB .45/1082 .45/ 854 .40/ 968 .45/ 953 .43/1161 .38/1190 .00/ 0
USNO .63/1561 .51/1427 .53/1549 .55/1496 .60/1570 .57/1565 .55/1555
VILL .51/1580 .45/1344 .45/1370 .49/1561 .54/1408 .61/1548 .00/ 0
YAR1 .00/ 0 .00/ 0 .00/ 0 .45/ 930 .46/1151 .47/1278 .42/ 906
YELL .40/1186 .38/1084 .37/ 916 .33/ 920 .40/1538 .41/1498 .41/1579
ZWEN .60/1091 .65/ 604 .46/ 874 .41/ 882 .52/1082 .00/ 0 .00/ 0
PRN01 .50/1668 .50/1495 .45/1600 .41/1280 .41/1629 .43/1594 .59/1712
PRN02 .45/1890 .45/1674 .44/1926 .46/1949 .45/2108 .47/2191 .49/2108
PRN03 E .56/1764 .58/1611 .58/1552 .45/1515 .46/1663 .44/1687 .51/1721
PRN04 .54/1932 .46/1629 .53/1804 .52/1896 .47/2137 .49/2005 .51/1994
PRN05 .50/1817 .51/1640 .48/1736 .45/1675 .46/1967 .52/1992 .52/1924
PRN06 E .58/1717 .52/1526 .50/1624 .52/1705 .52/1824 .58/1791 .52/1765
PRN07 E .48/1913 .45/1688 .46/1900 .50/1852 .47/2095 .47/2026 .45/1902
PRN08 .48/1904 .49/1553 .46/1757 .53/1875 .46/2021 .45/1998 .49/1959
PRN09 .57/1712 .51/1233 .56/1943 .49/1829 .48/2159 .48/2118 .47/1933
PRN10 E .52/1406 .50/1443 .50/1632 .53/1690 .51/1747 .48/1716 .49/1582
PRN11 .53/1973 .52/1772 .46/1966 .45/1940 .46/2124 .46/2164 .54/2190
PRN13 .52/1688 .46/1250 .46/1542 .52/1283 .47/1723 .42/1545 .52/1650
PRN15 .58/1837 .52/1609 .55/1522 .47/1746 .46/1993 .44/1821 .49/1713
PRN17 .51/1757 .49/1557 .47/1571 .63/1610 .64/1816 .47/1801 .47/1845
PRN19 .48/1754 .46/1419 .41/1664 .44/1659 .41/1738 .44/1672 .48/1665
PRN20 E .52/1652 .50/1674 .46/1639 .50/1644 .51/1870 .49/1879 .53/1926
PRN21 E .50/1523 .51/1430 .48/1371 .45/1557 .50/1615 .51/1744 .51/1549
PRN22 .57/1615 .56/1534 .53/1348 .46/1547 .50/1750 .52/1803 .58/1583
PRN23 E .73/1293 .78/1323 .63/1370 .62/1526 .79/1638 .63/1606 .72/1256
PRN24 .54/1854 .49/1129 .51/1853 .50/1842 .48/2056 .46/1951 .45/1955
PRN25 .50/1717 .48/1458 .46/1659 .49/1587 .47/1882 .49/1838 .51/1858
PRN26 .62/1881 .57/1747 .55/1734 .54/1733 .50/2012 .46/1969 .52/1869
PRN27 .48/1736 .47/1466 .43/1651 .45/1602 .49/1894 .42/1806 .48/1764
PRN28 .55/1740 .48/1579 .48/1571 .52/1775 .49/1736 .48/1860 .57/1710
PRN29 .51/1778 .47/1700 .42/1656 .43/1822 .50/2079 .47/1881 .55/1922
PRN30 .52/1591 .54/1622 .50/1748 .53/1734 .51/1942 .51/1890 .55/1987
PRN31 E .55/1882 .56/1731 .47/1740 .48/1849 .48/1859 .50/1845 .52/1853
Pseudo Range Statistics
rms (cm) / # obs
00nov26 00nov27 00nov28 00nov29 00nov30 00dec01 00dec02
---------------------------------------------------------------------
ALGO 33/1509 30/1407 28/1445 24/1337 32/1570 25/1441 33/1562
AREQ 25/1458 0/ 0 0/ 0 0/ 0 24/1426 25/1693 23/1430
ARTU 0/ 0 0/ 0 0/ 0 0/ 0 0/ 0 30/1558 31/1524
ASC1 82/1019 70/1324 73/1208 0/ 0 0/ 0 0/ 0 73/ 963
AUCK 59/1171 62/1302 56/1322 49/1437 50/1378 55/1387 57/1290
BAHR 29/1559 30/1231 27/1377 28/1518 28/1272 26/1286 26/1463
BRMU 61/1292 67/1246 68/1235 64/1262 56/1333 50/1377 52/1273
CAS1 0/ 0 0/ 0 0/ 0 24/1453 23/1425 25/1455 23/1502
CHAT 76/1300 77/1076 71/1310 73/1415 73/1325 0/ 0 0/ 0
CHUR 20/1174 19/1024 18/ 864 18/ 911 19/1507 19/1468 20/1576
COCO 0/ 0 0/ 0 0/ 0 0/ 0 0/ 0 22/ 995 28/ 832
DRAO 32/1423 33/1499 33/1488 34/1452 34/1500 33/1510 33/1542
EISL 76/ 934 71/ 963 75/1045 70/ 951 74/1162 80/1011 75/1033
FAIR 24/1104 0/ 0 24/ 831 24/ 770 57/1360 23/1372 23/1394
GUAM 0/ 0 41/1441 0/ 0 0/ 0 0/ 0 0/ 0 34/1589
IISC 0/ 0 0/ 0 0/ 0 0/ 0 76/ 905 78/ 797 0/ 0
IRKT 0/ 0 65/1353 63/1414 68/1330 60/1469 53/1310 0/ 0
KIT3 38/1420 37/1389 38/1266 0/ 0 0/ 0 0/ 0 0/ 0
KOUR 44/1519 0/ 0 0/ 0 42/1215 0/ 0 0/ 0 0/ 0
KWJ1 59/ 865 0/ 0 0/ 0 0/ 0 0/ 0 0/ 0 0/ 0
LHAS 29/1509 29/1231 0/ 0 30/1199 0/ 0 29/1311 29/1367
MAC1 0/ 0 0/ 0 26/ 999 27/1136 27/1210 28/1159 25/1279
MATE 58/1438 56/1567 54/1497 56/1514 56/1420 60/1398 0/ 0
MAW1 32/1368 30/1398 30/1368 31/1464 31/1433 31/1574 30/1588
MCM4 51/ 904 53/ 890 49/ 811 47/ 970 0/ 0 0/ 0 55/1056
MKEA 22/1437 22/1542 23/1544 22/1518 23/1453 21/1284 22/1386
NLIB 81/1137 0/ 0 62/1203 56/1273 60/1319 0/ 0 0/ 0
NRC1 41/1201 47/1155 31/1489 29/1384 32/1531 34/1573 48/1570
NRC2 43/1246 0/ 0 33/1431 32/1428 34/1528 37/1516 53/1571
NYAL 0/ 0 45/ 895 45/ 941 44/1310 45/1416 46/1542 43/1598
ONSA 36/1484 0/ 0 36/1423 37/1532 37/1570 37/1570 38/1541
PERT 57/1408 0/ 0 60/1256 0/ 0 0/ 0 0/ 0 0/ 0
PIE1 80/ 901 69/1107 74/1130 0/ 0 67/1148 67/1284 63/1244
RIOG 0/ 0 30/1562 0/ 0 0/ 0 0/ 0 0/ 0 0/ 0
SANT 37/1397 37/1332 45/1389 50/1326 49/1449 51/1531 45/1448
STJO 23/1572 26/1570 43/1333 25/1558 24/1591 26/1585 44/1514
THU1 45/1187 39/1227 41/ 671 38/1202 38/1500 35/1399 36/1610
TIDB 24/1537 25/1365 28/1479 28/1236 0/ 0 0/ 0 24/1409
TIXI 33/ 847 35/1299 36/ 978 34/1059 36/1733 34/1605 34/1700
TSKB 69/1082 60/ 854 56/ 968 56/ 953 62/1161 68/1190 0/ 0
USNO 36/1561 38/1427 38/1549 38/1496 37/1570 37/1565 37/1555
VILL 25/1580 27/1344 24/1370 26/1561 26/1408 24/1548 0/ 0
YAR1 0/ 0 0/ 0 0/ 0 54/ 931 63/1151 48/1278 70/ 906
YELL 26/1186 28/1084 26/ 916 26/ 920 29/1538 31/1498 30/1579
ZWEN 52/1092 50/ 605 56/ 874 69/ 882 56/1082 0/ 0 0/ 0
PRN01 50/1595 46/1378 50/1466 40/1221 49/1436 43/1530 41/1538
PRN02 44/1801 39/1611 43/1832 40/1854 40/1978 39/2048 32/2013
PRN03 E 45/1627 49/1418 46/1353 46/1379 46/1429 42/1506 46/1534
PRN04 42/1842 39/1575 41/1694 40/1770 45/1977 37/1870 35/1896
PRN05 48/1770 46/1499 46/1608 43/1649 46/1729 42/1806 41/1792
PRN06 E 45/1635 44/1408 41/1463 42/1588 44/1629 41/1568 40/1561
PRN07 E 40/1837 41/1623 41/1813 39/1762 45/1939 38/1907 39/1818
PRN08 42/1815 40/1494 45/1678 41/1773 40/1873 38/1838 36/1863
PRN09 49/1643 51/1201 48/1783 44/1726 46/1910 39/1893 40/1820
PRN10 E 51/1378 48/1368 51/1494 45/1601 48/1575 44/1512 43/1490
PRN11 45/1868 43/1617 48/1820 42/1814 41/1905 41/2031 42/2015
PRN13 49/1652 52/1203 50/1440 48/1237 43/1562 39/1490 38/1548
PRN15 44/1770 45/1480 41/1361 41/1641 45/1811 42/1694 43/1576
PRN17 47/1650 50/1462 49/1463 45/1517 46/1664 43/1668 45/1709
PRN19 50/1653 46/1361 50/1549 44/1535 47/1561 41/1544 38/1521
PRN20 E 48/1583 46/1601 48/1537 44/1556 47/1697 41/1831 41/1790
PRN21 E 48/1456 44/1324 49/1251 43/1452 49/1444 45/1622 43/1405
PRN22 47/1510 48/1317 51/1145 44/1401 48/1451 43/1553 45/1294
PRN23 E 48/1294 47/1234 47/1264 44/1462 46/1490 41/1492 50/1160
PRN24 43/1799 42/1106 44/1729 42/1726 41/1896 37/1820 36/1864
PRN25 44/1591 47/1363 49/1466 42/1428 43/1658 38/1646 39/1590
PRN26 48/1792 45/1590 47/1558 43/1660 48/1779 43/1774 41/1761
PRN27 46/1650 44/1388 48/1551 41/1492 42/1710 38/1649 36/1628
PRN28 52/1621 52/1461 53/1452 46/1645 51/1527 44/1712 47/1581
PRN29 47/1695 44/1566 46/1474 41/1677 44/1866 42/1715 39/1684
PRN30 48/1530 47/1480 45/1590 45/1617 49/1688 41/1671 42/1791
PRN31 E 44/1764 41/1581 43/1590 41/1720 43/1659 39/1680 37/1652
Station Clock Offsets Solution for 0h UT
(microsecond / sigma in ns)
00nov26 00nov27 00nov28 00nov29 00nov30 00dec01 00dec02 sig
------------------------------------------------------------------------
ALGO 2.0504 2.2491 REF 2.0878 REF REF REF .6
AREQ 107.1524 --- --- --- 3.1832 30.1460 18.7883 .4
ARTU --- --- --- --- --- -2.1315* -2.1586* .3
ASC1 .1981* .1731* -1.9145 --- --- --- -2.1389 .8
AUCK -.0351 .0626 -2.0107 .0024 -2.0746 -2.0505 -2.1543 .4
BAHR 762.6895 762.8796 760.6223 762.7041 760.6108 760.6026 760.5976 .3
BRMU .0294 .1775 -2.0671 .0055 -2.0778 -2.0868 -2.1424 .3
CAS1 --- --- --- .0018 -2.1114 -2.1030 -2.0931 .4
CHAT .0255 .1861 -2.0714 .0250 -2.1412 --- --- .4
CHUR -3.1338 -2.9295* -5.1712 -3.0863* -5.1733 -5.1816 -5.1778 .9
COCO --- --- --- --- --- -2.0968* -2.1115* .4
DRAO REF .2044 !!ms!! !!ms!! !!ms!! -1.7268 -1.7249 .4
EISL -.1085 .2198 -2.0283 -.1217 -2.1185 -2.0857 -2.1017 .4
FAIR 1.2397 --- -.8363 1.2373 -.8613 -.8778 -.8924 .5
GUAM --- .0353 --- --- --- --- -2.2533 .3
IISC --- --- --- --- -2.1042 -2.1224 --- .6
IRKT --- -.2422 -2.5091 -.4392 -2.5452 -2.5619 --- .3
KIT3 -.0183 .1763 -2.0675 --- --- --- --- .3
KOUR 420.7655* --- --- 421.2275* --- --- --- 1.1
KWJ1 .0052* --- --- --- --- --- --- 1.2
LHAS -.0232 .1887 --- .0016 --- -2.0924 -2.1182 .3
MAC1 --- --- -2.1925 -.1031 -2.1954 -2.2123 -2.2371* .4
MATE 524.7674* 524.6594* 522.1031* 523.8818* 521.4844* 521.1741* --- .3
MAW1 -.0472 .2211 -2.1345 .0142 -2.0772 -2.1035 -2.1679 .4
MCM4 47.0927* 1.4491* 14.5869 32.8875 --- --- 37.7038 .7
MKEA -.1946 -.0223 -2.2627 -.2122 -2.3039 -2.3108 -2.3197 .3
NLIB -2.1442 --- -4.2015 -2.1170 -4.2089 --- --- .3
NRC1 -.0057 .1812 -2.0768 REF -2.0987 -2.1092 -2.1215 .3
NRC2 -.0173 --- -2.0883 -.0116 -2.1103 -2.1207 -2.1332 .3
NYAL --- .2477 -2.0382 .0103 -2.1154 -2.1546 -2.1947 .4
ONSA -.0354 --- -2.1011 -.0273 -2.1103 -2.1283 -2.1385 .3
PERT -.0981 --- -2.5740 --- --- --- --- .4
PIE1 .0731 .3523 -1.9126 --- -1.9458 -1.9631 -1.9805 .3
RIOG --- .0633 --- --- --- --- --- .3
SANT -.0032* .1707 -2.1245 -.0790* -2.2669* -2.1003 -2.1609 .5
STJO .0855 .2691 -1.9662 .1305 -1.9512 -1.9780 -1.9834 .3
THU1 -.0217 .2015 -2.0675 .0073 -2.0849 -2.1191* -2.1460 .6
TIDB 868.8279 869.0335 866.7917 868.8868 --- --- 866.8219 .4
TIXI -.0940* .0996* -2.1378* -.0623* -2.1506* -2.1665* -2.1840* .4
TSKB 1.3318 1.5210* -.7470 1.3289 -.7664 -.7708 --- 1.0
USNO .1052 REF -2.2585 -.1803 -2.2781 -2.2886 -2.2994 .3
VILL -1.8512 -1.6906 -3.9962 -1.9728 -4.1300 -4.1839 --- .3
YAR1 --- --- --- -.6306* -1.6380* -2.4529* -3.2957* .8
YELL .5305 .7193* -1.5396 .5381* -1.5591 -1.5683 -1.5802 .9
ZWEN -1.8997 .2194 -2.0231 -.0121 -2.0941 --- --- .7
Notes: * indicates epoch other than 0h UT
Sig are sigmas, in ns, averaged over 7 days
!!ms!! indicates offsets greater than 1 millisecond
global: ALGO AREQ ARTU ASC1 AUCK BAHR BRMU CAS1 CHAT CHUR COCO DRAO EISL FAIR
global: FORT GUAM HOB2 HRAO IISC IRKT JAB1 KIT3 KOUR KWJ1 LHAS MAC1 MALI MATE
global: MAW1 MCM4 MKEA NLIB NRC1 NRC2 NYAL ONSA PERT PIE1 RIOG SANT SEY1 STJO
global: SUTH THU1 TIDB TIXI TSKB USNO VILL YAR1 YELL ZWEN
--
Geodetic Survey of Canada
Ottawa, Ontario, Canada
Internet: pierre at geod.nrcan.gc.ca
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