Ib cov kab uas tsis yog-xwm txheej
Ob peb xyoos dhau los, ntawm lub rooj sib tham txhua xyoo ntawm "Sourveying thiab Mapping"los ntawm Tebchaws Meskas kuv nco qab ua tim khawv ib qho ntawm cov pa luam yeeb uas ua rau koj hais tsis tau lus, thiab tsis yog vim peb cov lus Askiv kawm tsis hloov mus rau gringo caliche. Nws yog hais txog kev nthuav qhia ntawm Kevin Sahr, Jon Kimerling thiab Denis White hauv lawv qhov kev nthuav qhia "Ib qho Geodesic Discrete Global Grid Systems", uas nyob rau hauv peb cov lus Latin txhais tau tias:
Lub tswv yim tsis raws cov duab.
Kev ua haujlwm zoo ntawm cov neeg tsim khoom ntawm geodesy yog los hloov qhov chaw hemispherical mus rau qhov khoom kawg ntawm cov duab plaub, yuav luag txhua qhov kev kwv yees geodesic tau xav txog hauv lub hauv paus ntsiab lus uas lawv tau tsim, thiab nws yog "los luam daim duab qhia chaw", uas yog. yog vim li cas uas yuav luag tag nrho cov approximations ntawm lub ellipsoids, nyob rau hauv lub zos ua ib tug yuav luag daim duab plaub thiab nws lub ntsiab yog vim li cas kaum tsib xyoo dhau los yog yuav tsum tau luam tawm ob daim ntawv qhia nyob rau tib lub teev thiab yuav tsum tau mus koom nyob rau hauv lawv cov npoo.
Lub tswv yim ntawm cov txiv neej no yog raws li kev sib cav hais tias nyob rau hauv no point nyob rau hauv technology, luam ntawv tsis yog tib yam vim li cas peb faib lub quasi-spherical geometry ntawm lub ntiaj teb no, tab sis theej rau geolocation lub hom phiaj; Raws li GIS / CAD cov cuab yeej pom kev pom thiab cov ntawv thov txawb hloov mus rau kev siv, tsis muaj qhov xav tau rau kev suav cov geolocation nyuaj. Qhov kev tsom xam no ua rau kev cog lus los txiav txim siab txog qhov tsawg kawg nkaus ntawm geodesic qhia nyob rau hauv daim duab peb sab nrog nkhaus npoo, uas yog qhov kev hloov kho uas daim duab peb sab yuav tau txais vim lub ntiaj teb curvature, yog li ntawd nws tsis muaj dab tsi ntau tshaj li ib ntu ntawm qhov chaw, ntawm cov npoo kho. mus rau curvature ntawm lub ntiaj teb thiab nws qhov chaw sib raug mus rau ib qho kev xav hauv nruab nrab ntawm lub ntiaj teb, los yog polar kab ntawm lub spheroid.
Ib tug zoo haus luam yeeb uas tawm tsam dab tsi nws raug nqi rau peb to taub lub ntsiab cai ntawm Mercator nyob rau hauv cov chav kawm Geodesy hehe.
