测量基准，又称大地原点，是测量的参照点。在大地测量学及测量中，大地原点是一组用来对照测量点的地球坐标，往往与地理测量体系的参考椭球体模型有关。
... measuring appliance 测量器具，测量设备 measuring basis 测量基准 measuring bridge 测量电桥 ...
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... 测量基线 reference line for measurement 测量基准 measuring datum 测量基面 reference plane for measurement ...
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... 测量基准 Geodetic datum ; datum ; Geographic datum ; Geodetic origin 压铸件测量基准 MEASURE DATUMS 世界辐射测量基准 WRR ...
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测量基准建立 Measurement Datum Setup
测量基准点 datum mark
执行效果测量基准 control baseline ; progress baseline ; performance measurement baseline ; BCWS
绩效测量基准 Performance Measurement Baseline ; PMB
世界辐射测量基准 WRR
大地测量基准 geodetic datum
水准测量基准点 Leveling reference point ; Level surveying datum point
横贯大陆三角测量基准 Transcontinental Triangulation Datum
压铸件测量基准 MEASURE DATUMS
Meanwhile, the way advanced previously that the collimation beam of light acts as measuring basis and the four-quadrant photocell as receiver is not applied practically. Moreover, laser interferometer is too expensive to be extended.
传统的直线度检测方法,如平尺法、水平仪、钢丝法等,虽然检测器具简单,实际中常被采用,但各自都存在一定的局限性,测量精度不高,效率低,性能无法保证；与此同时,以准直光束为测量基准,四象限光电池为接收器件的方法由于种种原因一直未能实用化,而激光干涉仪测量法则由于其价格过高,而难以得到推广。
参考来源 - 大长度导轨直线度视觉测量方法的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
七岁时进行的测试为孩子在学校中的学习发展提供了一个测量基准。
Tests at the age of seven provide a benchmark against which the child's progress at school can be measured.
测量时用作测量基准的参考点。
时间的测量最早发源于地球围绕它的轴自转并以其为测量基准。
The measurement of time first originated and is based on the earth's motion upon its axis.
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