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national astro-geodetic network
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national astro-geodetic network
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大地起算数据
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national astro-geodetic network
国家天文大地网
在中国领土范围内,由互相联系的大地测量点(简称大地点)构成的网,大地点上设有固定标志,以便长期保存和使用。简称国家大地网。建立国家大地网的经典方法是边角测量,需要采用天文观测方法测定天文经纬度和方位角,所以又称为天文大地网。
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