该方 法包括：将需要的图纹通过激光全息术记录到感光板上，制得具有全息图纹 的光学掩模板；
The method comprises the following steps: recording a required pattern onto a photographic plate through laser holography and manufacturing an optical mask plate with the holographic pattern;
详细介绍了光学测微法跨江水准测量方法、场地选择、场地布设、砚板制作、观测方法、记录格式等内容。
This paper introduced the field selection, field planning, vane production, observation methods, and record format of river-crossing leveling in detail.
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