020301hA - Survey Equipment - Part A
Well above or below eye level, where possible
For safe use, at what height should laser levels be set?
Foresight
From the initial reading turning the instrument to aim at a new point will give the height of that point above or below the instrument. This is called the:
Has a suspended prism.
How does an automatic level compensate for up to 12 degrees out of level?
A plumb bob or optical plummet
How is a transit accurately positioned over a specific point?
Adjusting split bubble
How is fine level adjustments accomplished when using a tilting level?
2
How many people are required when optical levels are used?
Holes in the floors
In very high buildings when transferring a point using a plummet, what special requirement is needed?
Elevation, geodetic
_________ can refer to the height of a point above or below a reference point (a benchmark or datum point) or it can refer to the _______ elevation (height above sea level)
A target rod
A 19 x 38 x 2 metre board, being used to transfer elevations, is what kind of rod?
A barcode staff/rod
A barcode staff/What type of target is required for the digital level?
1. Greater accuracy because many points are recorded. 2. Greater speed in mapping surfaces. 3. Points that are inaccessible with traditional survey methods can be mapped. 4. 3D images can be recorded.
Name four (4) uses for high-definition surveying.
1. Increased speed and accuracy because the instrument interpolates the reading. 2. Data collection and transfer. 3. The ability to measure horizontal distance.
Name three (3) advantages of the digital level.
Starting, datum, permanent, geodetic
Surveying requires a ________ point. This can be a _____ point previously surveyed by the government and is usually marked with a brass pin set in a _________ location. The marker is the ________ elevation.
T
The fixed beam laser level produces only a single beam of light. T or F
It does all data recording and calculations
The greatest advantage of the total station is:
T
The rotary level can produce both horizontal and vertical lines. T or F
Optical and Laser
The two (2) categories of levels are:
Only one person
What does the operation of a laser level require? One or two people
A plumb bob
What does the optical plummet on an instrument take the place of?
Plumb bob
What does the optical plummet on an instrument take the place of?
To measure horizontal and vertical angles.
What is the primary purpose of a transit?
to measure horizontal and vertical angles
What is the primary purpose of a transit?
Establishing horizontal lines and angles.
What is the primary role for transits in construction?
Prisms
What is used in a fixed beam laser to enable the operator to lay out a 90 degree angle?
Produces a point cloud; a dense blanket of points.
What makes high-definition surveying so precise?
Electronic distancing measuring (EDM)
What modern system does the total station use to measure distances?
Prism target
What type of target is used with a Total Station to measure and calculate distances, elevations and angles?
A sensor at the rod location (receiver)
When using a laser level with an infrared laser, what other piece of equipment is required?
Theodolites and laser levels
Which instruments can be used as a reference to accurately plumb the edges of columns?
Laser level
Which type of level will give a constant reference point?
split bubble
A tilting level uses a _____ ______ to make fine adjustments.
foresight
Aiming at a rod on a new point gives a _________ reading.
backsight
Aiming at a rod set on the datum or benchmark fives a _________ reading.
Automatic, level
An _________ level need only be rough-levelled because the suspended _____ compensates for up to 12 degrees out-of-level.
Elevation
By adding or subtracting the backsight and foresight to the benchmark you will get the ____________________of the new point.
An optical plummet
To set up directly over a point, what is built in to many modern instruments that eliminates the need for a plumb bob?
Vertical angles
Two vernier scales are found on a transit, a horizontal and a vertical. For what is the vertical scale used?
Stadia lines
What are the lines called in the telescope of a transit that has a ratio of 1:100?
