Levels are used to measure relative differences in height, i.e. altitude. The accuracy of the altitude measurement depends on the quality of the instrument, environmental conditions, measurement methods, and the used measuring or surveying equipment.
GLM distinguishes between self-leveling (automatic) and digital levels. Automatic levels allow users (person at the instrument) to read off values by looking through the eyepiece (ocular) and record these values themselves. With digital levels, users focus the instrument on the target and then trigger the measurement. This value is determined electronically. This is possible by using a barcode stake. Data is stored and can be read on-site and/or at the office.
The following is needed to measure with a level:
- A level
- A tripod
- A level rod or stake
- A bottom plate (Frosch)
Division into three classes:
Accuracy: up to +/- 10 mm on 1 km
Accuracy: +/- 3 - 5 mm on 1 km
Accuracy: +/- 0.1 - 1 mm on 1 km; (this type of instrument is now increasingly used in industrial surveying applications)
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