Home Forum Download Account
ҤǨʹʵ觻
ѡ
· ˹á
· дҹ
· ŢͧҤ
· ǹ
· 
· ǹŴ
· ẺǨ
· ԷԹԨͧҤ
· 
· ʹԵԴѹѺ
· ͧ
· ͧѺ
· 
· ʶԵԡҪ
· ش
· Ǣͧ
͡
͡ٻẺ:

ҤǨʹʵ觻: кҵ˹

Ǣ͹:   
[ Ѻ价˹á | س͡Ǣ ]


Location Based Services (LBS) description

ҹ͸ԺǡѺкҡ

http://www.vcharkarn.com/varticle/40674 ѧ͸Ժ

д application ҹ Google ҹ Iphone

кҵ˹

ѹ֡ admin ظ 06 .. 11@ 14:08:47 ICT (1000 )
(ʴ? | ṹ: 0)



Tip: ҵ˹觴 ͶẺ GPS

кҵ˹

ѹ֡ admin ҷԵ 03 .. 10@ 08:54:28 ICT (1755 )
(ʴ? | ṹ: 3.5)



How GPS works

кҵ˹

ѹ֡ admin ҷԵ 29 .. 10@ 20:07:54 ICT (1327 )
(յ... | 846 亵 | ʴ? | ṹ: 0)



ѧѴҧʵ

..ġ ª

ѧѴҧҵ͡ѧѴ 躹ҡ ѡá͡ѧѴġ 觨褧 ˹ º͹ѺѧѴк GPS ¹ к GPS ѡ÷Һ˹觴 ѧѴзҧҡ֧ͧѺѭҳ ѧѴʵ ѡҵ˹觢ͧǨҡ ش Astronomy Alamac Ҥ еԨٴ Right Ascention ͧԨٴ Declination ͧ ǹѴШҡǶ֧ǡͧ繡ѧѴ ٧ ҡͺҶ֧Ǵ 繡ѧѴҷǼҹ ᷹

кҵ˹

ѹ֡ admin ҷԵ 07 .. 10@ 11:18:28 ICT (2765 )
(յ... | 3378 亵 | ʴ? | ṹ: 4)



Ǩҧ GEODETIC

..ġ ª

ǨҧзӺšǹǢͧѺҹἹ еͧա÷͹ҷѧѴŧѡҹö令ӹdzͧҡ 鹼šͧٻç͹ٻçҧâҤԵ ٵСäӹdz͹ Ǩա÷͹ŧ鹼ѡҹ͹ ٻç WGS84 ¡ Ǩҧ GEODETIC

Ǩҧ GEODETIC Ǩ شѡҹҧҺ Ǩҧ СǨ çǧͧš Gravity

кҵ˹

ѹ֡ admin 30 .. 09@ 09:37:47 ICT (2748 )
(յ... | 2134 亵 | ʴ? | ṹ: 4.42)



Network RTK

..ġ ª

͹ҧ⪤ҧ ˹ҷçҹͧǢͧѺ෤ҧ ҧҧ觷ҡФ鹤ҡ ҧҧ繡觷ͧ 㨵ͧ

ҡ͹ Ԫ GPS ҡͧ GPS Ẻ˹ԸաҤҾԡѴẺó(Absolute) ͧ GPS ẺѧѴաѧѴẺѹ (Relative) ෤շ¡ RTK ͡ѧѴẺѹẺѹշѹ(Real time)觤һѺ´٧繡ûѺҴ͹ͧ鹺ҡȴеͧѺͧ GPS ẺѧѴԴͧ ҧҡԸա DGPS 繡觤ѺҴ͹ͧҡ仴 ֧繡ûѺѺͧͪԴͧͪԴ Code ͧ GPS Ẻ˹繵ҵ˹ ´ҹҡ http://www.resgat.net/modules.php?name=News&file=article&sid=4

кҵ˹

ѹ֡ admin ҷԵ 14 .. 08@ 15:21:55 ICT (2898 )
(յ... | 2523 亵 | ʴ? | ṹ: 5)



ǷҧҤ٧¨ҡѧѴͧ GPS ẺѧѴ

..ġ ª

Ҥ٧¹ѺԸաѧѴ¡ԹдѺ¶ дѺӷŻҹҧ 繵᷹ͧͧ鹼 㹻Ҷ ӷŻҹҧѡ .ШǺբѹ繨ش鹢ͧҹǨѡҹҧԸաҤ٧ԸաԹдѺ Ф繨ӹǹҡ 繡ǨẺͧ

Ǩͧ GPS ẺѧѴ ١ͧ٧Ҥ٧ҡͧѧѴк GPS 繤Ҥ٧˹ͷç 觡Ҥ٧ Ƿҧ¹Ҥ٧˹ͷç 繤٧ҧ ֧繷ùҨ֡

ٻʴѹ鹰ҹҧ šԧ зçҧԧ: H = h + N

Ѩغѹ Ƿҧ¹Ҥ٧˹ͷç 繤٧ ¡ѹ 5 Ըմѧ

1.ǷҧẺͧҡ EGM96

2.ǷҧẺͧҡ EGM2008

3.ǷҧẺͧҡ EGM96 ѺشдѺͻѺբ

4.Ƿҧ㹡Ẻͧҡ EGM96 Ѻ鹼(Correction surface)

5.Ƿҧ Local Geoid Ѻ

кҵ˹

ѹ֡ admin ѹ 10 .. 08@ 12:45:50 ICT (2544 )
(յ... | 2295 亵 | ʴ? | ṹ: 5)



GPS Base Station

..ġ ª

ôԹ кҵ˹ к GPS դ١ͧ٧ ѧѴẺѹ СѧѴẺ ͧ ͧ GPS ͧͧ ͧ˹觵躹شҺ˹(BASE STATION) աͧ˹觵躹شҺ˹(ROVER) ôԹҵ˹觷١ͧ ͧʶҹ ROVER öз ͧԸդ

1. Ըա÷¡ Post processing 繡ûѺ ѧѧѴ

2. աԸ˹觡͡觢ŤԴҴѧʶҹ ROVER Ẻѹѹͷ¡ DGPS ѺѧѴẺ CODE RTK ѺѧѴẺ Phase (ҹ ´ԸաѧѴ http://www.resgat.net/modules.php?name=News&file=article&sid=4 )

кҵ˹

ѹ֡ admin ظ 23 .. 08@ 09:14:20 ICT (3921 )
(յ... | 2501 亵 | ʴ? | ṹ: 3.5)



ٻçͧ GEOID ·ɮբͺࢵͧ STOKES

.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

кҵ˹

ѹ֡ admin ʺ 03 .. 08@ 15:09:48 ICT (3961 )
(յ... | 9684 亵 | ʴ? | ṹ: 4)



Gravity,GEOID ellipsoid

..ġ ª

繷Һ šѹѹ ç֧ٴ gravitation þ觷躹š ͡ҡ͡šç§ҡٹҧ centrifugal potential ç֧ٴšҡѹdzš ҡ¢Ѻ šҵ

кҵ˹

ѹ֡ admin ѧ 12 .. 06@ 15:20:27 ICT (3970 )
(յ... | 6324 亵 | ʴ? | ṹ: 5)