Based on GPS technology and digital leveling,the measurement and data-handling of the repetition of datum are presented.

Some Points in Using Digital Level;

Function Characters and Surveying Principle of Digital Level of DiNi Series;

Aiming to read data automatically with digital level, the localization algorithm of the double sinusoid barcode staff was studied according to coding principle that different widths of bar code represent different altitudes of staff, which was used in digital leveling to accomplish automatic staff reading.

Algorithm in image recognition for coded level ruler of digital levels;

Introduction to digital levels and measurement algorithm;

Image processing for coded level ruler of digital levels is the critical technology to realize the automatic reading of digital levels.

The electronic digital level DL-101C is introduced in this paper.

The behavior,the characteristics,and the prospects for the application of electronic digital level is introduced briefly in this paper,as the example of electronic digital level DL - 101c which is made by Topcon Corporation of Japan.

It is discovered in the actual observations that the Angle i error of DiNi12 Digital Leveller is unstable and changeable and has the trend of changing with the rise of temperature.