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Desvio da vertical. Elipsóide. Geóide. Normal. Vertical. DATUM. Montanha. Oceano. Oceano. DATUM HORIZONTAL Medidas referenciadas a Vertical do lugar não a Normal (correção do desvio da vertical) Adoção de ponto onde o Elipsóide e o Geóide são tangentes. Vértice Astro Chuá ou SAD-69.

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DATUM

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  1. Desvio da vertical Elipsóide Geóide Normal Vertical DATUM Montanha Oceano Oceano DATUM HORIZONTAL • Medidas referenciadas a Vertical do lugar não a Normal (correção do desvio da vertical) • Adoção de ponto onde o Elipsóide e o Geóide são tangentes. • Vértice Astro Chuá ou SAD-69 DATUM VERTICAL • NMM  comum para todo o mundo • Determinação da média dessa variação em locais especiais com pouca amplitude de Maré (uso de Marégrafos) • Marégrafo de Imbituba-SC

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