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第一節(jié) 全國GPS一、二級網(wǎng)
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全國GPS一、二級網(wǎng)是由總參測繪局建立(圖4-1)。一級網(wǎng)由45個點(diǎn)組成,較均勻地覆蓋了我國大陸和南海島嶼。除南海島嶼外,其他點(diǎn)均為國家天文大地網(wǎng)點(diǎn),同時是水準(zhǔn)點(diǎn)或水準(zhǔn)直接聯(lián)測點(diǎn),相鄰點(diǎn)間距離最大1667km,最短86km,平均點(diǎn)距約68 （共 736 字） [閱讀本文] >>

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第一節(jié) 全國GPS一、二級網(wǎng) 全球?qū)Ш?

第一節(jié) 全國GPS一、二級網(wǎng)
全球?qū)Ш?