数字水准仪编码水准尺的图像处理是实现数字水准仪自动读数的关键技术。
Image processing for coded level ruler of digital levels is the critical technology to realize the automatic reading of digital levels.
电子水准仪的出现是水准测量技术一次大的变革。
The emergence of electronic level is a great technique change of level survey.
数字水准仪在1990年推出，它的问世革新了传统意义上的水准测量。
The digital level was pushed out in 1990; its appearing has reformed leveling method to traditional meaning.
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