CM 2105 DELATTE FINAL QUESTIONS
& ANSWERS(RATED A+)
Differential Global Positioning System (DGPS) - ANSWEROffers enhanced locational
measurements through radio beacons that provide corrections
Global Navigation Satellite System (GNSS) - ANSWERAllows us to locate things on the
surface of the Earth with extraordinary accuracy using a network of 24 satellites that
continuously transmit high-frequency radio signals
Line of Sight - ANSWERAt least three satellites must be in view of a receiver to
calculate longitude and latitude, as a fourth satellite calculates altitude
Static Operational Method - ANSWERProcess used to establish reference points such
as the CORS location used by NGS
Real Time Kinematic (RTK) - ANSWERA process where corrections are transmitted in
real-time from a reference receiver at a known location to one or more remote rover
receivers
GPS Orbiting Error - ANSWEROccasionally a satellite's reported position doesn't match
its actual trajectory
Visible Light and electronic level - ANSWERTwo types of general lasers
Horizontal Plane and Vertical Plane - ANSWERWhat are the two types of rotating
lasers?
Multi-path signals - ANSWERSignals may be reflected off objects
Atomic Clock - ANSWERThis is a highly accurate timekeeping device powered by a
hydrogen atom
Cesium atom-powered clock - ANSWERPossesses an error of about one second in 1
million years
Constellation - ANSWERThe network of orbiting global navigation satellites
Satellite Based Augmentation System (SBAS) - ANSWEREmploys a network of
geostationary satellites and ground stations that enhance a GNSS
Orbiting Errors - ANSWERWhich type of interference needs to be considered when
using GPS for construction layout and surveying?
, Fixed - ANSWERWhat type of laser does not have to be checked for calibration?
Hydrogen - ANSWERAn atomic clock is a highly accurate timekeeping device powered
by a __________ atom.
Normal-tension - ANSWER__________ tension is the tension required to cancel out
sag and tension correction.
0.01/100 ft - ANSWERThe rule of thumb with maintaining precision is that forward and
back measurements should be within __________ measured agreement.
engineer's chain - ANSWERThe __________ is much easier to use and is significantly
easier when measurements are added or subtracted.
metric - ANSWER__________ chains are generally available in lengths of 5, 10, 20,
and 30 meters.
chain - ANSWERBreaking __________ is a process that is used to measure up steep
slopes. This involves measuring in lengths shorter than the full chain length.
True - ANSWERThe shortest distance between two points is a straight line, so measure
straight between two points.
False - ANSWERChain length is used to express the distance measured in thousandths
of feet.
True - ANSWERPossibly the greatest source of error in chaining is that the users are
not familiar with the chain.
Step 1 - ANSWERLocate two objects about 250 feet apart where it would be possible to
glue onto or nail into a 2-foot or 1-meter section of an old rod. This could be old power
poles, light poles, buildings, bridge piers, etc. Obtain permission to do this from the
owner.
Step 2 - ANSWERSet up the leveling instrument precisely between these two objects,
make sure it is level, and sight towards each object, and mark the line of sight on the
object. Because of the geometry of the instrument, these marks will be the same
elevation.
Step 5 - ANSWERCompare the readings. The decimal part of the reading should be the
same if the instrument is in proper adjustment. If the decimal parts are different, the
instrument needs adjusting.
& ANSWERS(RATED A+)
Differential Global Positioning System (DGPS) - ANSWEROffers enhanced locational
measurements through radio beacons that provide corrections
Global Navigation Satellite System (GNSS) - ANSWERAllows us to locate things on the
surface of the Earth with extraordinary accuracy using a network of 24 satellites that
continuously transmit high-frequency radio signals
Line of Sight - ANSWERAt least three satellites must be in view of a receiver to
calculate longitude and latitude, as a fourth satellite calculates altitude
Static Operational Method - ANSWERProcess used to establish reference points such
as the CORS location used by NGS
Real Time Kinematic (RTK) - ANSWERA process where corrections are transmitted in
real-time from a reference receiver at a known location to one or more remote rover
receivers
GPS Orbiting Error - ANSWEROccasionally a satellite's reported position doesn't match
its actual trajectory
Visible Light and electronic level - ANSWERTwo types of general lasers
Horizontal Plane and Vertical Plane - ANSWERWhat are the two types of rotating
lasers?
Multi-path signals - ANSWERSignals may be reflected off objects
Atomic Clock - ANSWERThis is a highly accurate timekeeping device powered by a
hydrogen atom
Cesium atom-powered clock - ANSWERPossesses an error of about one second in 1
million years
Constellation - ANSWERThe network of orbiting global navigation satellites
Satellite Based Augmentation System (SBAS) - ANSWEREmploys a network of
geostationary satellites and ground stations that enhance a GNSS
Orbiting Errors - ANSWERWhich type of interference needs to be considered when
using GPS for construction layout and surveying?
, Fixed - ANSWERWhat type of laser does not have to be checked for calibration?
Hydrogen - ANSWERAn atomic clock is a highly accurate timekeeping device powered
by a __________ atom.
Normal-tension - ANSWER__________ tension is the tension required to cancel out
sag and tension correction.
0.01/100 ft - ANSWERThe rule of thumb with maintaining precision is that forward and
back measurements should be within __________ measured agreement.
engineer's chain - ANSWERThe __________ is much easier to use and is significantly
easier when measurements are added or subtracted.
metric - ANSWER__________ chains are generally available in lengths of 5, 10, 20,
and 30 meters.
chain - ANSWERBreaking __________ is a process that is used to measure up steep
slopes. This involves measuring in lengths shorter than the full chain length.
True - ANSWERThe shortest distance between two points is a straight line, so measure
straight between two points.
False - ANSWERChain length is used to express the distance measured in thousandths
of feet.
True - ANSWERPossibly the greatest source of error in chaining is that the users are
not familiar with the chain.
Step 1 - ANSWERLocate two objects about 250 feet apart where it would be possible to
glue onto or nail into a 2-foot or 1-meter section of an old rod. This could be old power
poles, light poles, buildings, bridge piers, etc. Obtain permission to do this from the
owner.
Step 2 - ANSWERSet up the leveling instrument precisely between these two objects,
make sure it is level, and sight towards each object, and mark the line of sight on the
object. Because of the geometry of the instrument, these marks will be the same
elevation.
Step 5 - ANSWERCompare the readings. The decimal part of the reading should be the
same if the instrument is in proper adjustment. If the decimal parts are different, the
instrument needs adjusting.
