The Great Trigonometrical Survey waxay ahayd mashruuc loogu talagalay in lagu cabbiro dhamaan qaarada Hindiya oo dhan si sax ah oo cilmiyaysan. Waxaa bilaabay 1802 sarkaalkii lugta William Lambton, oo hoos imaanaya shirkadda East India Company. Hogaamintiisa ku xigtay, George Everest, mashruucan waxaa loo sameeyay mas'uuliyadda Sahanka Hindiya. Everest waxaa ku guuleystey Andrew Scott Waugh ka dibna 1861 mashruuca waxaa hogaaminayay James Walker, oo arkay dhammaystirka ugu horeeya ee 1871. Su'aal: Muxuu ahaa ujeedada Sahanka Trigonometrical Great?
waxay cabireysaa dhulka hoostiisa ee Hindiya.