... ground control approach n. 地面控制进场 ground control map (航测)地面控制图 ground control survey of tunnel 隧道地面控制测量 ...
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The BS will send these information to main control PC computer on the ground through CAN bus, and the PC processes the data to get the MS location and displays it on the electronic map.
固定信息站通过CAN总线把位置信息上传到井上主控PC机，在PC机上进行处理并在电子地图上显示出来。
When the precise geometric rectification of TM imagery was made with the ground control points selected from topographic map in scale of 1:100000, the accuracy of half a pixel is high.
由1：10万地形图选取平面控制点对TM磁带进行精处理，平面定位精度为半个象元，精度较高；
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