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ติดประกาศ ʺ 03 .. 08@ 15:09:48 ICT โดย admin
ٻçͧ GEOID ·ɮբͺࢵͧ STOKES
кҵ˹


.طԾ ç ..ġ ª

ٻҧԧͧ GEOID 觷ѡԷʵ 鹤ҹҹ ֧ٻҧԧͧ GEOID 觼ŷö֧ çҧšͧ šͧŷԴҡªԴѹ 㹧ҹǨҧ GEODESY ٻҧ GEOID դǢͧ GEOID 繾ҧԧҧ 蹤 ٧ԻȨҧԧ٧˹дѺ GEOID з ҧԧҧҺٻçͧ Ellipsoid 蹤 ˹觾ԡѴҧԧٻç Ellipsoid

·ҹҨʧ ҧԧҧҺ֧鹼 Ellipsoid ᷹繼 GEOID ӵͺ ͧҡ鹼 Ellipsoid ѡɳٻçҧâҤԵ աࡳ ٵѺá˹˹ҡ GEOID ٻҧٵ÷ҧԵʵ㹡äӹdzҧ͹ ͧҡöҺ˹蹢ͧ÷͹ͧš ͧҡҡѺѺ͹ͧԸաäӹdz GEOID ҧȨ֧дѺӷŻҹҧ繼дѺҧԧ٧ 觶§Ѻ GEOID 觼ҧԧҧ觢ͧ ʴѡɳԻ٧ѡɳзؤŷѺ (ҧԧҧ觷Ţͧ 繵ҧ)

ٻҧͧ GEOID ·ɮբͺࢵͧ STOKES ԰ҹ㴹͡ GEOID ѧâͧš˹ GEOID еͧ١غ GEOID ֧öФӹdz GEOID ҡٵâͧⵡ (Stokes formula) §Ѻٵâͧع (Bruns formula) 蹤 ٧GEOID, N, (geoid undulation) ¹



㹡äӹdz٧ GEOID ˹㴵˹˹¡ (1) 鹨еͧŤǧͧǷ駺dzš 㹷ҧԺѵԹöӹdz㹺ǹ鹷ӡѴ ˵عԴšз͡äӹdz ֧ͧԸա÷˵ҷ᷹ѧ СáçҧǤ蹪ǧǢͧGEOID Ҵ 觪ǧǢͧ GEOID öӹdzẺͧ GEOID ҡ, NEGM, ᷹ С÷ͧŤǧ١Ѵ繨شǶء 5- 10 »ҳТҹҴͧ ֧繵ͧäӹdzẺ͹ء᷹Թô 觨çҧǤ蹪ǧҹҧͧ GEOID, NΔg, ǹͧçҧǤ蹪ǧ鹢ͧ GEOID, NDEM, 鹨Ҩҡ DEM դ´ԧ鹷ҳ 90 ٧ çҧ GEOID ǹԴҡ DEM 㹡äӹdzͧҡҾԻ (terrain correction) dzͺ˹觷ӹdzҤ N

㹻 աԨͷ LOCAL GEOID Ѻ 觨繡Ԩҧ Է§СἹ ¡෤Ԥ Remove and Restore Ҥ N ¡§ѺẺͧGEOID ҡ Ҿǧ͹ Ф٧ҡ DEM öʴѹҧѧ÷ (2)

N = NEGM + NΔg + NDEM (2)

д¡§÷ (2) ҡѺšԹдѺǻȢͧἹҧش㹷ҧʶԵ ҴҨз LOCAL GEOID Ѻ 觼ö дѺҡ ҡѧѴ GPS дѺ ӡдѺ +/- 10 .

Ҿ Animate ʴٻҧͧ GEOID

Ҿ Animate ʴٻҧͧ GEOID ẺҺ ҡšѴǧ´ὴ GRACE (Gravity Recovery And Climate Experiment) ͧѰԡ (: http://www.csr.utexas.edu/grace/gallery/animations/ggm01/index.html)

͡ҧԧ

شǨǧʹ §ҹšǨἹʹçഫ

ͿԡШӻ ҳ 2550 ͧഫͿԡ Ἱ ͧѭҡ÷٧ش

Heiskanen, W.A. and H. Moritz (1979): Physical Geodesy. San Francisco (Reprint 1996 by Department of Civil and Environmental Engineering and Geodetic Science, The Ohio State University, Columbus, Ohio).

Moritz, H. (1980): Advanced Physical Geodesy. Herbert Wichman Verlag, Karlsruhe (Reprint 2001 by Department of Civil and Environmental Engineering and Geodetic Science, The Ohio State University,Columbus, Ohio).

Sansó, F. and R. Rummel (1997): Lecture Notes in Earth Sciences: Geodetic Boundary Value Problems in view of the One Centimeter Geoid.Springer.

Wichiencharoen, C. (1982): Fortran program for computing geoid undulations from potential coefficients and gravity anomalies. OSU Report, Department of Geodetic Science and Surveying, The Ohio State University.

http://gge.unb.ca/Research/GRL/GeodesyGroup/tutorial/tutorial.htm

http://gge.unb.ca/Research/GRL/GeodesyGroup/research/geoid.htm



 
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