Digital levels use electronic image processing to test the special bar-coded staff reading, this bar-coded pattern is converted into elevation and distance values using a digital image matching procedure within the instrument.
Advantages of digital level
1- Correction of collimation error: Can be reliably determined and saved using the four integrated Check and Adjust procedures or it can be entered manually
2- Minimize human error: Fatigue-free observation as visual staff reading by the observer is not required.
3- User-friendly menus with easy to read, digital display of results.
4- Earth curvature correction: The measurements made are automatically free of the influence of the earth’s curvature.
5- Measurement of consistent precision and reliability due to automation.
6- Automatic data storage eliminates booking and its associated errors.
7- We can operate in low light conditions.
manufacturers have claimed 8- Fast, economic surveys resulting in saving in time
9- Data on the storage medium of the level can be downloaded to a computer enabling quick data reduction for various purposes.
Components of digital level
Main components of the digital level consist of two parts: Hardware (Digital level and levelling staff) and Software.
1- Both digital level and associated staff are manufactures so that they can be used for both conventional and digital operations.
2- Typically digital level has the same optical and mechanical components as a normal automatic level.
3- However, for the purpose of electronic staff reading a beam splitter is incorporated which transfers the bar code image to a detector diode array.
4- The light, reflected from the white elements only of the bar code, is divided into infrared and visible light components by the beam splitter.
5- The visible light passes on to the observer, the infrared to diode array.
6- The acquired bar code image is converted into an analogous video signal, which is then compared has a stored reference code within the instrument.
Types of digital levels
1- Spinter 50
2- Spinter 150
3- Spinter 150m
4- Spinter 250m
5- Leica DNA10 Digital Level
6- Leica DNA03 Digital Level