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2. Water level (device) - Wikipedia

   en.wikipedia.org/wiki/Water_level_(device)

   The water level at each end of the tube will be at the same elevation, whether the two ends are adjacent or far apart, so a line between them will be horizontal at its midpoint and a shed base, building foundation or similar structure laid out using several such lines will be "horizontal" within building tolerances on any scale over which use ...

3. Topographic Abney level - Wikipedia

   en.wikipedia.org/wiki/Topographic_Abney_Level

   An Abney level and clinometer is an instrument used in surveying which consists of a fixed sighting tube, a movable spirit level that is connected to a pointing arm, and a protractor scale. An internal mirror allows the user to see the bubble in the level while sighting a distant target.

4. Level (optical instrument) - Wikipedia

   en.wikipedia.org/wiki/Level_(optical_instrument)

   The surveyor does this with the use of a bull's eye level built into the instrument mount. The surveyor looks through the eyepiece of the telescope while an assistant holds a vertical level staff which is graduated in inches or centimeters. The level staff is placed with its foot on the point for which the level measurement is required.

5. Hydrographic survey - Wikipedia

   en.wikipedia.org/wiki/Hydrographic_survey

   This method revolutionized hydrographic surveying, as it allowed a quicker, less laborious, and far more complete survey of an area than did the use of lead lines and sounding poles. From a navigational safety point of view, a wire-drag survey would not miss a hazard to navigation that projected above the drag wire depth.

6. Levelling - Wikipedia

   en.wikipedia.org/wiki/Levelling

   Turning is a term used when referring to moving the level to take an elevation shot from a different location. To "turn" the level, one must first take a reading and record the elevation of the point the rod is located on. While the rod is being kept in exactly the same location, the level is moved to a new location where the rod is still visible.

7. Inclinometer - Wikipedia

   en.wikipedia.org/wiki/Inclinometer

   The Abney level is a handheld surveying instrument developed in the 1870s that includes a sighting tube and inclinometer, arranged so that the surveyor may align the sighting tube (and its crosshair) with the reflection of the bubble in the spirit level of the inclinometer when the line of sight is at the angle set on the inclinometer.

8. Drone pilot can't offer mapping without North Carolina ...

   www.aol.com/news/drone-pilot-cant-offer-mapping...

   A North Carolina board that regulates land surveyors didn't violate a drone photography pilot's constitutional rights when it told him to stop advertising and offering aerial map services because ...

9. Category : Bodies of water of Hampton County, South Carolina

   en.wikipedia.org/wiki/Category:Bodies_of_water...

   Category: Bodies of water of Hampton County, South Carolina. ... South Carolina (1 C, 3 P) This page was last edited on 25 June 2017, at 22:42 (UTC). Text ...