第二節(jié) 國家A、B級(jí)網(wǎng)
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國家A、B級(jí)網(wǎng)由國家測繪局設(shè)計(jì)實(shí)施,A級(jí)網(wǎng)由30個(gè)主點(diǎn)和22個(gè)副點(diǎn)組成。A級(jí)網(wǎng)進(jìn)行了兩次外業(yè)觀測,第一次于1992年進(jìn)行,在27個(gè)主點(diǎn)和6個(gè)副點(diǎn)上進(jìn)行9晝夜連續(xù)觀測,使用AshtechMD12、Trimble4000SST接收機(jī)。第二次復(fù)測在1996年進(jìn)行,使用14臺(tái)Ash （共 683 字） [閱讀本文] >>

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