S+SNZ Professional Examination — Spatial Measurement Option (New Zealand)

A surveyor uses a retroreflective prism with a physical offset (prism constant) of -30 mm. If the total station is accidentally set to a prism constant of 0 mm, what will be the effect on the recorded distance?

• AThe measured distance will be 30 mm too short.
• BThe measured distance will be 30 mm too long.
• CThe measured distance will be correct, as the instrument self-calibrates.
• DThe measured distance will have an error that scales proportionally with the distance.

When conducting high-precision digital leveling over a distance of 2 km, which of the following field procedures is most effective in eliminating the combined effect of Earth's curvature and atmospheric refraction?

• AKeeping backsight and foresight distances equal.
• BUsing a high-quality invar leveling rod.
• CTaking measurements only at midday when the air is stable.
• DPerforming a two-peg test before starting the run.

A total station is set up, and a distance of 1,200 m is measured at a temperature of 35°C and an atmospheric pressure of 1,005 hPa. If the instrument's internal atmospheric correction was left at standard conditions (15°C and 1013 hPa), what is the approximate error introduced into the measurement?

• AThe measured distance will be approximately 24 mm too short.
• BThe measured distance will be approximately 24 mm too long.
• CThe measured distance will be approximately 5 mm too short.
• DThe measured distance will be approximately 5 mm too long.

Under the Cadastral Survey Rules 2021, what is the measurement purpose of referencing specified boundary points to permanent reference marks (PRMs)?

• ATo provide physical evidence of the boundary line's position for landowners.
• BTo preserve independently measured relationships from which the boundary point can be rel…
• CTo serve as the primary coordinate control station for the Landonline database.
• DTo satisfy local authority requirements for road alignment setbacks.

Which of the following GNSS errors is local to the receiver station and cannot be mitigated or canceled out by differential positioning (RTK) techniques?

• AIonospheric delay
• BTropospheric delay
• CSatellite clock error
• DMultipath interference

A surveyor performs a two-peg test on a dumpy level. Setup A shows a height difference of 1.505 m between Peg 1 (backsight = 2.105 m) and Peg 2 (foresight = 0.600 m) with the instrument placed exactly midway. Setup B (instrument close to Peg 1) shows a backsight of 1.850 m and a foresight of 0.355 m to Peg 2. What is the collimation error of this instrument?

• AZero collimation error
• B+0.010 m (pointing upwards)
• C-0.010 m (pointing downwards)
• D+0.020 m (pointing upwards)

Which GNSS observation strategy is most appropriate when a control-network specification requires the highest relative baseline precision and a defensible post-survey quality assessment?

• ANetwork RTK (VRS)
• BPrecise Point Positioning (PPP)
• CLong-duration static session with post-processing
• DSingle-frequency DGPS

How does the presence of dense tree canopy affect the quality of GNSS measurements, and what is the best field mitigation strategy?

• AIt causes attenuation, loss of lock, and multipath; move to a clearer site or use an inde…
• BIt has no effect on GNSS signals, as trees are transparent to L-band microwave frequencie…
• CIt introduces a systematic clock bias; mitigate by applying a differential correction fro…
• DIt increases the ionospheric delay; mitigate by using dual-frequency receivers.

Which workflow correctly reduces a raw total-station slope distance to a grid distance on NZTM2000?

• AApply the instrument/target corrections, reduce the corrected slope distance to an ellips…
• BApply grid scale factor, apply atmospheric correction, apply prism constant, reduce slope…
• CApply prism constant, apply atmospheric correction, apply grid scale factor, reduce slope…
• DReduce slope to horizontal at ground level, apply grid scale factor, apply prism constant…

For precise trigonometric heighting across a valley, which observation design best controls the effect of uncertain vertical refraction?

• AObserve one direction once and apply a universal refraction coefficient.
• BObserve only near midday because the refraction coefficient is then constant.
• CUse reciprocal, preferably near-simultaneous observations and compare independent height…
• DIgnore refraction whenever the line of sight is steeper than 10 degrees.

What is the primary function of the 'compensator' in a modern total station or digital level?

• ATo adjust the EDM signal frequency for atmospheric density changes.
• BTo automatically correct the horizontal and vertical angle readings for minor mis-levelin…
• CTo calculate the earth curvature correction based on the measured distance.
• DTo align the GNSS receiver phase center with the optical line of sight.

Which of the following describes the correct procedure for checking the circular bubble vial on a prism pole?

• AHold the pole on a point, center the bubble, rotate the pole 180 degrees, and check if th…
• BCompare the bubble to a total station's electronic tilt sensor over a 100 m baseline.
• CCenter the bubble, lay the pole flat on the ground, and measure the deflection.
• DPlumb the pole using a calibrated bipod, then adjust the vial screws until the bubble is…

When measuring horizontal angles for control networks, why is it standard practice to observe in both Face Left (FL) and Face Right (FR) instrument positions?

• ATo double the number of observations, which reduces random error by half.
• BTo reverse face-dependent instrumental effects so paired observations can expose them and…
• CTo prevent the total station's battery from discharging unevenly.
• DTo allow the instrument to reset its internal horizontal circle encoder.

A GNSS survey is planned to establish boundary witness marks. The rover receiver displays a GDOP of 7.5. What does this value indicate, and what is the best course of action?

• AExcellent geometry; proceed with the measurements immediately.
• BPoor satellite geometry; wait for the satellite configuration to improve to achieve a low…
• CA high level of multipath interference; move the receiver away from metallic surfaces.
• DThe receiver has lost its RTK correction link; check the cellular modem settings.

Why must curvature and refraction be modelled or controlled when a total station is used for precise trigonometric heighting over long sights?

• ABecause the vertical circle encoder of the total station loses resolution beyond 300 m.
• BBecause their vertical effect grows approximately with the square of sight length and can…
• CBecause the EDM laser beam diverges, making it impossible to target the prism.
• DBecause Landonline automatically rejects every vertical vector longer than 300 m.

When using an RTK GNSS receiver, what is the significance of a 'Fixed' solution compared to a 'Float' solution?

• AA 'Fixed' solution means the carrier-phase ambiguities have been resolved to integers; it…
• BA 'Float' solution means the receiver is floating on a network connection, providing mill…
• CA 'Fixed' solution indicates the receiver coordinates are permanently written to Landonli…
• DA 'Float' solution is only used when the base station is set up on a boat or moving platf…

A surveyor needs to establish vertical control on a project site using a digital level. What is the correct field check to perform before starting the survey?

• APerform a collimation test (two-peg test) to check the instrument's line of sight.
• BCalibrate the digital level against a total station EDM over a 500 m line.
• CSet the level on a tripod and check if the battery voltage is exactly 12V.
• DPerform a three-point resection using GNSS coordinates.

Why are continuous or long-session static GNSS observations post-processed for regional deformation monitoring instead of relying only on an RTK coordinate?

• ABecause RTK signals cannot cross international boundaries.
• BBecause post-processing preserves the raw observations and supports precise orbit/clock p…
• CBecause passive stations do not require electrical power to operate.
• DBecause Landonline only accepts post-processed baseline data.

When measuring a traverse, which of the following is a classic example of an 'independent check' on horizontal orientation?

• AMeasuring the distance to the backsight station twice.
• BPerforming a closed loop or closing onto a known reference mark with verified coordinates.
• CRe-leveling the instrument at each station.
• DUsing the same prism for all measurements.

How can a strong near-ground temperature gradient affect a leveling run, and what field practice helps control it?

• AIt causes horizontal refraction; minimize by leveling only on asphalt roads.
• BIt causes vertical refraction and shimmer; raise the line of sight above the strongest gr…
• CIt changes the physical length of the leveling rod; minimize by using timber rods.
• DIt introduces a systematic circle graduation error; minimize by observing in both faces.

When historical survey data are relevant to a New Zealand boundary definition, what is the sound measurement-analysis approach?

• AThe physical coordinates stored in the digital Landonline database.
• BGather all relevant evidence, assess its reliability under the applicable law, and test t…
• CThe current fencing and occupation lines established by landowners.
• DThe coordinates generated by a localized RTK GNSS survey.

Which of the following describes 'multipath' in GNSS, and what is its signature in field observations?

• AThe satellite signal traveling through multiple atmospheric layers; signature is a system…
• BThe satellite signal reflecting off objects near the antenna; signature is coordinate noi…
• CThe receiver tracking multiple satellite constellations; signature is a rapid drop in GDO…
• DA failure in the base station radio path; signature is a complete loss of signal.

When a traverse is also carrying trigonometric heights, why must instrument height (HI) and target height (HT) be measured and recorded to a precision consistent with the vertical tolerance?

• ATo comply with Landonline database schema requirements.
• BTo ensure horizontal distances are correctly reduced to the ellipsoid datum.
• CTo ensure vertical heights (Z coordinates) are correctly transferred through the traverse.
• DTo prevent collimation errors from affecting horizontal angle readings.

A total station EDM specification is stated as ±(1 mm + 1.5 ppm × distance). What specified one-distance uncertainty applies at 2,000 m?

• A1.5 mm
• B3.16 mm
• C4.00 mm
• D2.50 mm

Under rule 17 of the Cadastral Survey Rules 2021, how must specified points and marks on a primary parcel being created be connected to the cadastral survey network?

• AOnly if a first-order geodetic mark is within 500 m.
• BBy one or more adopted or measured vectors to a cadastral survey network mark within 1,00…
• COnly for parcels larger than 100 hectares.
• DOnly when the boundary is class A; class B and C surveys are exempt.

What is the primary advantage of using a 'choke ring' antenna in permanent GNSS installations?

• AIt amplifies weak signals from low-elevation satellites.
• BIt suppresses multipath signals reflecting from the ground and nearby structures.
• CIt protects the antenna from lightning strikes and extreme weather.
• DIt reduces the power consumption of the GNSS receiver.

A 2 mm lateral centering offset affects one direction observed over a 50 m sight. Using the small-angle approximation, what angular direction error does that offset represent?

• AApproximately 8 seconds of arc
• BApproximately 1.6 seconds of arc
• CApproximately 16 seconds of arc
• DApproximately 4 seconds of arc

When a retroreflective target sheet is observed at a steep angle, what must the surveyor control to avoid a systematic offset?

• ANothing; all target sheets have zero offset under every viewing geometry.
• BUse the defined target centre/reference surface and account for any offset between that s…
• CIncrease laser power until the sheet's physical surface coincides with the mounting point.
• DApply a projection grid scale factor to remove the target eccentricity.

Which statement correctly reflects rule 36 of the Cadastral Survey Rules 2021 for a new boundary mark?

• AEvery wooden peg must show the surveyor's licence number and both adjoining lot numbers.
• BA compliant wooden peg may be used; other peg/mark types must be clearly labelled as a bo…
• CEvery mark must carry a broad arrow and year of placement.
• DColour alone is the only identification required for every boundary mark.

Which of the following field practices is most critical when using an optical plummet to set up a total station over a control mark?

• AUsing the optical plummet only after the tribrach has been leveled.
• BChecking the optical plummet calibration by rotating the tribrach 180 degrees on the trip…
• CLooking through the optical plummet with both eyes open.
• DSetting the tripod legs at different widths to increase stability.

When planning a GNSS survey in a deep valley, which constellation configuration is most likely to improve positioning availability?

• AUsing GPS-only tracking with a high elevation mask.
• BMulti-GNSS tracking (GPS + GLONASS + Galileo + BeiDou) to maximize the number of visible…
• CObserving only at night when satellite signals are stronger.
• DReducing the receiver epoch interval to 0.1 seconds.

In total station EDM measurements, what is 'phase shift' technology used to measure?

• AThe atmospheric pressure at the target point.
• BThe distance to the prism, by comparing the phase of the transmitted and returned light w…
• CThe temperature of the total station's internal battery.
• DThe tilt of the horizontal axis.

What is the primary function of a 'ground plane' accessory when attached to a GNSS receiver antenna?

• ATo provide a stable leveling platform on soft ground.
• BTo block reflected signals coming from below the antenna, reducing multipath interference.
• CTo ground the antenna to prevent static electrical buildup.
• DTo increase the receiver's battery capacity.

Why does a surveyor measure the vertical index error of a total station, and how is it corrected in the field?

• ATo correct for earth curvature; corrected by entering the local latitude.
• BTo align the zero-point of the vertical circle with the true zenith; controlled by observ…
• CTo align the horizontal circle with geodetic north; corrected by astronomical observation…
• DTo correct for prism constant variations; corrected by entering the offset value.

Under the Cadastral Survey Rules 2021, what is the appropriate treatment when marking a new boundary point is impracticable because of an obstruction?

• AThe boundary point must be omitted from the survey plan.
• BLeave it unmarked under the applicable rule, but still define, reference, record, and rep…
• CThe boundary line must be bent to clear the obstruction.
• DThe surveyor must obtain permission to demolish the obstruction.

In high-precision vertical control surveys, why is 'double-run' leveling (forward and backward runs) standard practice?

• ATo double the height of the control marks.
• BTo detect and isolate mistakes (blunders) and ensure the leveling run meets accuracy tole…
• CTo verify the horizontal scale factor of the leveling rods.
• DTo satisfy local authority planning requirements.

For a short, well-modelled carrier-phase GNSS baseline, which errors commonly remain most site-specific after differential processing?

• AIonospheric delay
• BSatellite orbit errors
• CAntenna phase-centre effects and multipath
• DSatellite clock bias

When measuring a traverse, what workflow best reduces manual transcription errors while retaining an auditable field record?

• AUse an electronic data collector or direct instrument download, then verify identifiers,…
• BWriting all readings down in a field book using a soft pencil.
• CMemorizing the readings and entering them into the office computer later.
• DHaving a field assistant read the screen and write down the numbers.

A total station is setup over control mark A and backsights mark B. The surveyor notices that the optical plummet crosshairs are slightly offset from the mark. How does this setup error affect the observed horizontal angles?

• AIt introduces an eccentricity error that varies with the direction and distance to the ta…
• BIt only affects the measured distances, not the angles.
• CIt causes a constant angular shift on all observations.
• DThe internal compensator automatically corrects this setup error.

Which of the following classes of errors behaves in accordance with mathematical and physical laws, allowing them to be modeled and corrected?

• AGross errors (blunders)
• BSystematic errors
• CRandom errors
• DRedundant errors

In a closed five-station traverse, five equally weighted internal angles sum to 539°59'30". If the misclosure is within tolerance and an equal correction is specified, what is the misclosure and correction?

• AThe misclosure is +30", and 6" should be added to each angle.
• BThe misclosure is -30", and 6" should be added to each angle.
• CThe misclosure is -30", and 6" should be subtracted from each angle.
• DThe misclosure is +30", and 6" should be subtracted from each angle.

When performing a least squares adjustment on a survey network, what is the primary role of the 'redundancy' (degrees of freedom)?

• AIt represents the number of extra observations beyond the minimum required to define the…
• BIt is a measurement of the instrument's battery life.
• CIt defines the maximum allowable scale factor in Landonline.
• DIt is the number of control points held fixed during the adjustment.

If a single distance measurement has a standard deviation of ±5 mm, what is the standard deviation of the sum of three independently measured, adjacent distances?

• A±15.0 mm
• B±5.0 mm
• C±8.7 mm
• D±10.0 mm

Which of the following adjustments distributes the coordinate misclosure of a traverse proportionally based on the length of each traverse line?

• ATransit Rule
• BBowditch (Compass) Rule
• CLeast Squares Adjustment
• DCrandall Method

In statistics, how is the 'Standard Error of the Mean' related to the standard deviation of a single observation, and why is this important to surveyors?

• AIt is equal to the standard deviation divided by the square root of the number of observa…
• BIt is equal to the standard deviation multiplied by the number of observations; it shows…
• CIt is independent of the number of observations, representing a constant instrument limit…
• DIt is the log of the standard deviation, used to plot error ellipses in Landonline.

A 1,500 m traverse has a linear misclosure of +0.030 m in Easting and -0.040 m in Northing. If this project's specified minimum closure ratio is 1:20,000, what is the achieved ratio and does it pass?

• AClosure ratio is 1:30,000; it meets standard specifications.
• BClosure ratio is 1:21,428; it does not meet standard specifications.
• CClosure ratio is 1:37,500; it meets standard specifications.
• DClosure ratio is 1:15,000; it does not meet standard specifications.

How does a Least Squares Adjustment handle observations with different 'weights'?

• AIt treats all observations equally, regardless of weight.
• BIt gives higher priority to observations with lower weights to balance the network.
• CIt minimizes the weighted sum of squared residuals, with weights normally derived from th…
• DIt rejects any observation that has a weight below a user-defined threshold.