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Physical geodesy

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Le nombre adopté dans le Service international des Poids et Mesures pour la valeur de l'accélération normale de la pesanteur est 980,665 cm/sec², nombre sanctionné déjà par quelques législations. Déclaration relative à l'unité de masse et à la définition du poids; valeur conventionnelle de
963:
contributes to the total gravity acceleration, but other factors, such as the rotation of Earth, also contribute, and, therefore, affect the weight of the object. Gravity does not normally include the gravitational pull of the Moon and Sun, which are accounted for in terms of
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As mean sea level is physically realized by tide gauge bench marks on the coasts of different countries and continents, a number of slightly incompatible "near-geoids" will result, with differences of several decimetres to over one metre between them, due to the
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The geoid, or mathematical mean sea surface, is defined not only on the seas, but also under land; it is the equilibrium water surface that would result, would sea water be allowed to move freely (e.g., through tunnels) under the land. Technically, an
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Potential is expressed as gravity times distance, m·s. Travelling one metre in the direction of a gravity vector of strength 1 m·s will increase your potential by 1 m·s. Again employing G as a multiplier, the units can be changed to
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change your potential by 1 GPU. Which again means that the difference in geopotential, in GPU, of a point with that of sea level can be used as a rough measure of height "above sea level" in metres.
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of the geopotential, without the negation. In addition to the actual potential (the geopotential), a theoretical normal potential and their difference, the disturbing potential, can also be defined.
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A more convenient unit is the GPU, or geopotential unit: it equals 10 m·s. This means that travelling one metre in the vertical direction, i.e., the direction of the 9.8 m·s ambient gravity, will
1468: 814: 1707:§ 2.1: "The total force acting on a body at rest on the earth's surface is the resultant of gravitational force and the centrifugal force of the earth's rotation and is called gravity." 1392: 1314: 1212: 1508: 1055:, the geoid—mathematical mean sea level—sticks out as much as 100 m above the regular, rotationally symmetric reference ellipsoid of GRS80; in other places, like close to 1531: 1171: 1083: 1651: 164:
Ocean basins mapped gravitationally. Seafloor features larger than 10 km are detected by resulting gravitational distortion of sea surface. (1995,
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angles) are obtained with respect to this local vertical, and horizontal angles in the plane of the local horizon, perpendicular to the vertical.
543: 1717: 365: 533: 501: 1059:, it dives under the ellipsoid by nearly the same amount. The separation between the geoid and the reference ellipsoid is called the 645:
differences between points on the Earth's surface. These can then be expressed as "height" differences by conversion to metric units.
511: 1270:. (This is an oversimplification; in practice the location in space at which Îł is evaluated will differ slightly from that where 724:. Red shows the areas where gravity is stronger than the smooth, standard value, and blue reveals areas where gravity is weaker ( 713: 1217: 859:
will increase by about 9.8 metres per second (32 ft/s) every second. This quantity is sometimes referred to informally as
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Springer-Verlag Wien, 2005. (This text is an updated edition of the 1967 classic by W.A. Heiskanen and H. Moritz).
114: 907:(though this sometimes means the normal gravity at the equator, 9.7803267715 m/s (32.087686258 ft/s)), 1098: 725: 357: 85: 43: 1666: 820: 373: 96: 1348: 1280: 1720:(1901). "DĂ©claration relative Ă  l'unitĂ© de masse et Ă  la dĂ©finition du poids; valeur conventionnelle de 1553: 1047:
Due to the irregularity of the Earth's true gravity field, the equilibrium figure of sea water, or the
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is 9.80665 m/s (32.1740 ft/s) by definition. This quantity is denoted variously as
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The precise strength of Earth's gravity varies with location. The agreed upon value for
1782: 1765: 1598: 1541: 1118: 1068: 616: 588: 213: 183: 1786: 1696: 1603: 1398: 843:(N/kg or N·kg). Near Earth's surface, the acceleration due to gravity, accurate to 2 760: 752: 313: 298: 33: 1732:
Comptes Rendus des Séances de la Troisième Conférence· Générale des Poids et Mesures
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of an object on Earth's surface is the downwards force on that object, given by
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of the true geopotential, chosen to coincide (on average) with mean sea level.
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rely on the gravity field for orienting their vertical axis along the local
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the local terrain height value but apply a further correction called the
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In case the terrain is not a flat plate (the usual case!) we use for
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Study of the physical properties of the Earth's gravity field
1323:, and are the ones to be used in the above Stokes equation. 1117:
For every point on Earth, the local direction of gravity or
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Map of the undulation of the geoid in meters (based on the
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that is imparted to objects due to the combined effect of
1263:{\displaystyle \gamma =\|{\vec {\gamma }}\|=\|\nabla U\|} 661:
squared). This also can be expressed (multiplying by the
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NASA/JPL/University of Texas Center for Space Research.
1690: 1643: 1516: 1483: 1410: 1351: 1283: 1220: 1179: 1156: 1071: 784: 1463:{\displaystyle \Delta g_{B}=\Delta g_{FA}-a_{B},\,} 920:(which is also used for the variable local value). 88:. Unsourced material may be challenged and removed. 1797:Îłe = 9.780 326 7715 m/s² normal gravity at equator 1735:(in French). Paris: Gauthier-Villars. p. 68. 1525: 1502: 1462: 1386: 1308: 1262: 1206: 1165: 1077: 808: 1665:. Arlington, Texas: S.A.W.E., Inc. Archived from 1821: 809:{\displaystyle g=\|{\mathit {\mathbf {g} }}\|} 653:Gravity is commonly measured in units of m·s ( 1000:. For convenience it is often defined as the 720:of an idealized, smooth Earth, the so-called 565: 1257: 1248: 1242: 1227: 1201: 1186: 803: 791: 771:quantity, whose direction coincides with a 587:is the study of the physical properties of 32:It has been suggested that this article be 1691:Hofmann-Wellenhof, B.; Moritz, H. (2006). 1625:"PIA12146: GRACE Global Gravity Animation" 775:and strength or magnitude is given by the 572: 558: 539:Spatial Reference System Identifier (SRID) 534:International Terrestrial Reference System 1718:Bureau International des Poids et Mesures 1459: 1383: 1305: 607:Traditional geodetic instruments such as 148:Learn how and when to remove this message 1034: 707: 602: 159: 1649: 595:), with a view to their application in 1822: 1758: 1334:, which for a flat, horizontal plate ( 1387:{\displaystyle a_{B}=2\pi G\rho H,\,} 1309:{\displaystyle \Delta g=g-\gamma .\,} 716:mission, showing deviations from the 641:instruments again are used to obtain 1812:B. Hofmann-Wellenhof and H. Moritz, 1136: 823:, this acceleration is expressed in 86:adding citations to reliable sources 57: 18: 972: 544:Universal Transverse Mercator (UTM) 506:European Terrestrial Ref. Sys. 1989 13: 1806: 1517: 1484: 1427: 1411: 1284: 1251: 1214:, and calculated (normal) gravity 1157: 416:Ordnance Survey Great Britain 1936 382:Discrete Global Grid and Geocoding 273:Horizontal position representation 14: 1856: 712:Earth's gravity measured by NASA 1761:"Geodetic Reference System 1980" 1631:. NASA Jet Propulsion Laboratory 1274:has been measured.) We thus get 1207:{\displaystyle g=\|{\vec {g}}\|} 978:This section is an excerpt from 797: 700:This section is an excerpt from 684:per kilogram of attracted mass. 332:Global Nav. Sat. Systems (GNSSs) 182: 62: 23: 496:N. American Vertical Datum 1988 73:needs additional citations for 1752: 1710: 1684: 1616: 1236: 1195: 1099:dynamic sea surface topography 526:Internet link to a point 2010 456:Geodetic Reference System 1980 374:Quasi-Zenith Sat. Sys. (QZSS) 1: 1609: 1503:{\displaystyle \Delta g_{FA}} 1147:Above we already made use of 928:Newton's second law of motion 668:in order to change units) as 591:and its potential field (the 516:Chinese obfuscated datum 2002 1332:attraction of the topography 466:Geographic point coord. 1983 7: 1654:Precise Measurement of Mass 1547: 1319:These anomalies are called 1101:. These are referred to as 835:or m·s) or equivalently in 426:Systema Koordinat 1942 goda 10: 1861: 1695:(2nd ed.). Springer. 1554:Deflection of the vertical 1401:to be applied as follows: 1140: 1028: 977: 961:Gravitational acceleration 699: 694: 631:angles or, alternatively, 486:World Geodetic System 1984 49:Proposed since March 2024. 1650:Boynton, Richard (2001). 825:metres per second squared 476:North American Datum 1983 446:South American Datum 1969 1564:Friedrich Robert Helmert 1533:, the free-air anomaly. 1526:{\displaystyle \Delta g} 1166:{\displaystyle \Delta g} 1121:, materialized with the 1024: 648: 337:Global Pos. System (GPS) 304:Spatial reference system 1759:Moritz, Helmut (2000). 1062:undulation of the geoid 623:. After that, vertical 1527: 1504: 1464: 1388: 1310: 1264: 1208: 1167: 1131:astrogeodetic leveling 1079: 1044: 868:gravitational constant 810: 729: 663:gravitational constant 169: 1779:10.1007/s001900050278 1528: 1505: 1465: 1389: 1311: 1265: 1209: 1168: 1091:equipotential surface 1080: 1038: 811: 711: 603:Measurement procedure 232:Geographical distance 163: 1514: 1481: 1408: 1349: 1281: 1218: 1177: 1154: 1069: 782: 406:Sea Level Datum 1929 258:Geodetic coordinates 82:improve this article 1672:on 27 February 2007 1663:Sawe Paper No. 3147 1589:Mikhail Molodenskii 1016:is obtained as the 845:significant figures 718:theoretical gravity 676:of attracted mass. 436:European Datum 1950 394:Standards (history) 294:Reference ellipsoid 242:Figure of the Earth 1766:Journal of Geodesy 1599:Orthometric height 1542:terrain correction 1523: 1500: 1460: 1384: 1321:free-air anomalies 1306: 1260: 1204: 1163: 1129:to the geoid (see 1119:vertical direction 1075: 1045: 873:is referred to as 866:(in contrast, the 806: 730: 619:with the aid of a 617:vertical direction 314:Vertical positions 170: 97:"Physical geodesy" 1814:Physical Geodesy, 1702:978-3-211-33544-4 1604:Satellite geodesy 1475:Bouguer anomalies 1399:Bouguer reduction 1239: 1198: 1149:gravity anomalies 1137:Gravity anomalies 1078:{\displaystyle N} 761:centrifugal force 753:mass distribution 582: 581: 530: 529: 309:Spatial relations 299:Satellite geodesy 254: 158: 157: 150: 132: 56: 55: 51: 1852: 1800: 1799: 1794: 1793: 1756: 1750: 1749: 1746: 1728: 1714: 1708: 1706: 1693:Physical Geodesy 1688: 1682: 1681: 1679: 1677: 1671: 1660: 1647: 1641: 1640: 1638: 1636: 1620: 1574:Gravity of Earth 1532: 1530: 1529: 1524: 1509: 1507: 1506: 1501: 1499: 1498: 1469: 1467: 1466: 1461: 1455: 1454: 1442: 1441: 1423: 1422: 1393: 1391: 1390: 1385: 1361: 1360: 1315: 1313: 1312: 1307: 1269: 1267: 1266: 1261: 1241: 1240: 1232: 1213: 1211: 1210: 1205: 1200: 1199: 1191: 1172: 1170: 1169: 1164: 1084: 1082: 1081: 1076: 1006:potential energy 973:Potential fields 958: 944: 943: 919: 915: 906: 897: 888: 886:standard gravity 878: 872: 864: 815: 813: 812: 807: 802: 801: 800: 765:Earth's rotation 739: 734:gravity of Earth 726:Animated version 702:Gravity of Earth 585:Physical geodesy 574: 567: 560: 398: 397: 377: 369: 361: 353: 345: 285: 244: 186: 172: 171: 153: 146: 142: 139: 133: 131: 90: 66: 58: 47: 27: 26: 19: 1860: 1859: 1855: 1854: 1853: 1851: 1850: 1849: 1820: 1819: 1809: 1807:Further reading 1804: 1803: 1791: 1789: 1757: 1753: 1745: 1739: 1727: 1721: 1715: 1711: 1703: 1689: 1685: 1675: 1673: 1669: 1658: 1648: 1644: 1634: 1632: 1621: 1617: 1612: 1550: 1515: 1512: 1511: 1510:is our earlier 1491: 1487: 1482: 1479: 1478: 1450: 1446: 1434: 1430: 1418: 1414: 1409: 1406: 1405: 1356: 1352: 1350: 1347: 1346: 1338:) of thickness 1282: 1279: 1278: 1231: 1230: 1219: 1216: 1215: 1190: 1189: 1178: 1175: 1174: 1155: 1152: 1151: 1145: 1143:Gravity anomaly 1139: 1104:vertical datums 1070: 1067: 1066: 1033: 1027: 1022: 1021: 983: 975: 970: 969: 946: 932: 931: 917: 914: 908: 905: 899: 896: 890: 884: 876: 870: 862: 796: 795: 794: 783: 780: 779: 737: 722:Earth ellipsoid 705: 697: 651: 605: 589:Earth's gravity 578: 549: 548: 395: 387: 386: 375: 367: 359: 351: 343: 327: 319: 318: 277: 227: 219: 218: 194: 154: 143: 137: 134: 91: 89: 79: 67: 52: 28: 24: 17: 12: 11: 5: 1858: 1848: 1847: 1842: 1837: 1832: 1818: 1817: 1808: 1805: 1802: 1801: 1773:(1): 128–133. 1751: 1743: 1725: 1709: 1701: 1683: 1642: 1614: 1613: 1611: 1608: 1607: 1606: 1601: 1596: 1591: 1586: 1581: 1576: 1571: 1566: 1561: 1559:Dynamic height 1556: 1549: 1546: 1522: 1519: 1497: 1494: 1490: 1486: 1471: 1470: 1458: 1453: 1449: 1445: 1440: 1437: 1433: 1429: 1426: 1421: 1417: 1413: 1395: 1394: 1382: 1379: 1376: 1373: 1370: 1367: 1364: 1359: 1355: 1317: 1316: 1304: 1301: 1298: 1295: 1292: 1289: 1286: 1259: 1256: 1253: 1250: 1247: 1244: 1238: 1235: 1229: 1226: 1223: 1203: 1197: 1194: 1188: 1185: 1182: 1162: 1159: 1141:Main article: 1138: 1135: 1074: 1029:Main article: 1026: 1023: 1014:gravity vector 1012:, so that the 984: 976: 974: 971: 912: 903: 894: 857:falling freely 849:air resistance 805: 799: 793: 790: 787: 706: 698: 696: 693: 650: 647: 604: 601: 580: 579: 577: 576: 569: 562: 554: 551: 550: 547: 546: 541: 536: 528: 527: 524: 518: 517: 514: 508: 507: 504: 498: 497: 494: 488: 487: 484: 478: 477: 474: 468: 467: 464: 458: 457: 454: 448: 447: 444: 438: 437: 434: 428: 427: 424: 418: 417: 414: 408: 407: 404: 396: 393: 392: 389: 388: 385: 384: 379: 371: 363: 355: 347: 339: 334: 328: 325: 324: 321: 320: 317: 316: 311: 306: 301: 296: 291: 289:Map projection 286: 275: 270: 265: 263:Geodetic datum 260: 255: 239: 234: 228: 225: 224: 221: 220: 217: 216: 211: 206: 201: 195: 192: 191: 188: 187: 179: 178: 156: 155: 70: 68: 61: 54: 53: 31: 29: 22: 15: 9: 6: 4: 3: 2: 1857: 1846: 1843: 1841: 1838: 1836: 1833: 1831: 1828: 1827: 1825: 1815: 1811: 1810: 1798: 1788: 1784: 1780: 1776: 1772: 1768: 1767: 1762: 1755: 1748: 1742: 1734: 1733: 1724: 1719: 1713: 1704: 1698: 1694: 1687: 1668: 1664: 1657: 1655: 1646: 1630: 1626: 1619: 1615: 1605: 1602: 1600: 1597: 1595: 1594:Normal height 1592: 1590: 1587: 1585: 1582: 1580: 1577: 1575: 1572: 1570: 1567: 1565: 1562: 1560: 1557: 1555: 1552: 1551: 1545: 1543: 1539: 1534: 1520: 1495: 1492: 1488: 1476: 1456: 1451: 1447: 1443: 1438: 1435: 1431: 1424: 1419: 1415: 1404: 1403: 1402: 1400: 1380: 1377: 1374: 1371: 1368: 1365: 1362: 1357: 1353: 1345: 1344: 1343: 1341: 1337: 1336:Bouguer plate 1333: 1329: 1324: 1322: 1302: 1299: 1296: 1293: 1290: 1287: 1277: 1276: 1275: 1273: 1254: 1245: 1233: 1224: 1221: 1192: 1183: 1180: 1160: 1150: 1144: 1134: 1132: 1128: 1127:perpendicular 1124: 1120: 1115: 1113: 1112: 1106: 1105: 1100: 1094: 1092: 1086: 1072: 1064: 1063: 1058: 1054: 1050: 1042: 1037: 1032: 1019: 1015: 1011: 1007: 1003: 999: 998:gravity field 995: 991: 987: 981: 967: 966:tidal effects 962: 957: 953: 949: 942: 939: 935: 929: 925: 921: 911: 902: 893: 887: 881: 879: 869: 865: 858: 855:of an object 854: 850: 846: 842: 838: 834: 830: 827:(in symbols, 826: 822: 817: 788: 785: 778: 774: 770: 766: 762: 758: 754: 750: 746: 743: 736:, denoted by 735: 727: 723: 719: 715: 710: 703: 692: 690: 689:approximately 685: 683: 677: 675: 671: 667: 664: 660: 656: 646: 644: 640: 636: 634: 630: 626: 622: 618: 614: 610: 600: 598: 594: 590: 586: 575: 570: 568: 563: 561: 556: 555: 553: 552: 545: 542: 540: 537: 535: 532: 531: 525: 523: 520: 519: 515: 513: 510: 509: 505: 503: 500: 499: 495: 493: 490: 489: 485: 483: 480: 479: 475: 473: 470: 469: 465: 463: 460: 459: 455: 453: 450: 449: 445: 443: 440: 439: 435: 433: 430: 429: 425: 423: 420: 419: 415: 413: 410: 409: 405: 403: 400: 399: 391: 390: 383: 380: 378: 372: 370: 364: 362: 356: 354: 350:BeiDou (BDS) 348: 346: 340: 338: 335: 333: 330: 329: 323: 322: 315: 312: 310: 307: 305: 302: 300: 297: 295: 292: 290: 287: 284: 280: 276: 274: 271: 269: 266: 264: 261: 259: 256: 252: 251:circumference 248: 243: 240: 238: 235: 233: 230: 229: 223: 222: 215: 212: 210: 207: 205: 202: 200: 197: 196: 190: 189: 185: 181: 180: 177: 174: 173: 167: 162: 152: 149: 141: 130: 127: 123: 120: 116: 113: 109: 106: 102: 99: â€“  98: 94: 93:Find sources: 87: 83: 77: 76: 71:This article 69: 65: 60: 59: 50: 45: 41: 40: 35: 30: 21: 20: 1813: 1796: 1790:. Retrieved 1770: 1764: 1754: 1740: 1736: 1731: 1722: 1712: 1692: 1686: 1674:. Retrieved 1667:the original 1662: 1653: 1645: 1633:. Retrieved 1629:Photojournal 1628: 1618: 1537: 1535: 1472: 1396: 1342:is given by 1339: 1331: 1325: 1318: 1271: 1148: 1146: 1126: 1116: 1108: 1102: 1095: 1090: 1087: 1060: 1046: 1001: 986:Geopotential 980:Geopotential 956:acceleration 955: 951: 947: 940: 937: 933: 916:, or simply 909: 900: 891: 882: 874: 860: 818: 745:acceleration 731: 688: 686: 678: 665: 652: 643:geopotential 637: 621:spirit level 606: 593:geopotential 584: 583: 326:Technologies 281: / 193:Fundamentals 144: 138:October 2021 135: 125: 118: 111: 104: 92: 80:Please help 75:verification 72: 48: 37: 1676:22 December 1635:30 December 767:). It is a 749:gravitation 609:theodolites 204:Geodynamics 1845:Gravimetry 1840:Geophysics 1824:Categories 1792:2023-07-26 1610:References 1579:Gravimetry 1569:Geophysics 1473:so-called 1328:geophysics 1123:plumb line 763:(from the 759:) and the 613:plumb line 108:newspapers 1787:195290884 1518:Δ 1485:Δ 1444:− 1428:Δ 1412:Δ 1375:ρ 1369:π 1300:γ 1297:− 1285:Δ 1258:‖ 1252:∇ 1249:‖ 1243:‖ 1237:→ 1234:γ 1228:‖ 1222:γ 1202:‖ 1196:→ 1187:‖ 1158:Δ 1065:, symbol 1057:Sri Lanka 1008:per unit 990:potential 804:‖ 792:‖ 773:plumb bob 740:, is the 639:Levelling 633:elevation 615:or local 283:Longitude 209:Geomatics 1548:See also 1477:. Here, 1018:gradient 1002:negative 841:kilogram 821:SI units 674:kilogram 462:ISO 6709 360:(Europe) 358:Galileo 344:(Russia) 342:GLONASS 279:Latitude 268:Geodesic 226:Concepts 1835:Gravity 1830:Geodesy 1109:height 1053:Ireland 1004:of the 992:of the 988:is the 861:little 837:newtons 755:within 695:Gravity 670:newtons 597:geodesy 522:Geo URI 492:NAVD 88 402:NGVD 29 376:(Japan) 368:(India) 352:(China) 214:History 199:Geodesy 176:Geodesy 122:scholar 44:Discuss 39:Geodesy 1785:  1699:  1584:LAGEOS 1111:datums 924:weight 851:, the 769:vector 751:(from 682:joules 659:second 655:metres 629:zenith 625:angles 512:GCJ-02 502:ETRS89 482:WGS 84 472:NAD 83 452:GRS 80 412:OSGB36 366:NAVIC 247:radius 124:  117:  110:  103:  95:  34:merged 1783:S2CID 1670:(PDF) 1659:(PDF) 1125:, is 1049:geoid 1041:EGM96 1031:Geoid 1025:Geoid 994:Earth 948:force 930:, or 853:speed 757:Earth 714:GRACE 649:Units 442:SAD69 422:SK-42 237:Geoid 129:JSTOR 115:books 36:into 1697:ISBN 1678:2023 1637:2013 1397:The 1010:mass 952:mass 922:The 875:big 839:per 777:norm 732:The 672:per 657:per 432:ED50 249:and 166:NOAA 101:news 1775:doi 1729:". 1326:In 1133:). 1107:or 996:'s 959:). 880:). 819:In 742:net 84:by 42:. ( 1826:: 1795:. 1781:. 1771:74 1769:. 1763:. 1661:. 1627:. 1544:. 1114:. 1085:. 954:Ă— 950:= 936:= 898:, 816:. 728:). 599:. 1777:: 1747:. 1744:n 1741:g 1726:n 1723:g 1705:. 1680:. 1656:" 1652:" 1639:. 1538:H 1521:g 1496:A 1493:F 1489:g 1457:, 1452:B 1448:a 1439:A 1436:F 1432:g 1425:= 1420:B 1416:g 1381:, 1378:H 1372:G 1366:2 1363:= 1358:B 1354:a 1340:H 1303:. 1294:g 1291:= 1288:g 1272:g 1255:U 1246:= 1225:= 1193:g 1184:= 1181:g 1161:g 1073:N 1043:) 982:. 968:. 945:( 941:a 938:m 934:F 918:g 913:0 910:g 904:e 901:g 895:n 892:g 877:G 871:G 863:g 833:s 831:/ 829:m 798:g 789:= 786:g 738:g 704:. 666:G 627:( 573:e 566:t 559:v 253:) 245:( 168:) 151:) 145:( 140:) 136:( 126:· 119:· 112:· 105:· 78:. 46:)

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