📁 农业差异校正
Differential correction can be post-processed or achieved in real-time. In most cases, real-time correction is acquired from a differential correction provider who computes timing errors and transmits the differential correction to GPS receivers in the local area.
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Statistics on Women Obtained Through National Agricultural Censuses and Sample Surveys
http://www.fao.org/DOCREP/x0187e/x0187e00.htm