Digital Level Surveying

Digital levels use electronic image processing to evaluate 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

• Correction of collimation error: Can be reliably determined and saved using the four integrated Check and Adjust procedures or it can be entered manually
• Minimize human error: Fatigue-free observation as visual staff reading by the observer is not required.
• User friendly menus with easy to read, digital display of results.
• Earth curvature correction: The measurements made are automatically free of the influence of the earth’s curvature.
• Measurement of consistent precision and reliability due to automation.
• Automatic data storage eliminates booking and its associated errors.
• We can operate in low light conditions. 
• Fast, economic surveys resulting in saving in time (up to 50% less effort has been claimed by manufacturers).
• 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 digital level consist of two parts: Hardware (Digital level and levelling staff) and Software.

1. Both digital level and associated staff are manufactured 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 with 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 

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