| 1. | Usually GPS is somewhat less accurate than traditional precise leveling, but may be similar over long distances.
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| 2. | Ground deformation ( precise leveling and tilt meters ) during the 3rd week of August 2014 recorded edifice inflation.
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| 3. | When precise leveling, a series of measurements between two points are taken using an instrument and a measuring rod.
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| 4. | PHIVOLCS also deploys electronic distance meters ( EDMs ), precise leveling benchmarks, and portable fly spectrometers to monitor the volcano's daily activity.
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मोबाइल