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Bahan-GG-4

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Sudut Zenit• Hasil pengukuran sudut zenit hanya dipengaruhi oleh efek gravimetrik.• Agar sudut zenit mengacu ke arah normal ellipsoid, sudut tersebutharus dikoreksi oleh efek defleksi vertikal.θ = defleksi vertikalP 2θz 12topografiuz 12P 1zz( ξ cosα+ η α )12 = z12u + 1 12 1sinu12= sudut zenit ukuran di P 112a rahg ayaberatnormalellipsoidξ 1 ,η 1 = komponen defleksi vertikal di P 1α 12 = asimut geodetik sisi P 1 P 2

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