NV Land Surveyor common mistakes
NV Land Surveyor · Understand the traps and how to avoid them.
Computing a traverse closure or area, then reporting the raw unadjusted value instead of the adjusted one, or adjusting the angular closure by distributing it equally to all angles including the fixed backsight.
Candidates memorize the arithmetic steps (sum of interior angles = (n-2)×180°, latitude/departure sums) but never internalize that the exam question usually asks for the adjusted coordinates or the balanced area. The angular misclosure must be distributed only among the measured angles, not the fixed control direction, and this distinction is easy to blur under time pressure.
What to do instead
Before computing, write down what quantity the question asks for (adjusted coordinates, linear misclosure, precision ratio, or area) and work backward from that. Practice a fixed routine: compute angular misclosure, distribute it across measured angles only, recompute bearings from the corrected angles, then compute latitudes/departures, then apply the compass (Bowditch) rule proportionally to line length. Verify that the adjusted sums equal zero before computing area by coordinates.
Applying a scale factor or grid-to-ground correction in the wrong direction, or omitting the combined factor entirely when converting between ground distances and state plane coordinates.
The combined factor is a product of the map projection scale factor and the elevation (sea-level) factor, and candidates often cannot recall whether to multiply or divide, or which factor is less than one. Because both factors are near unity, a wrong-direction error produces a small discrepancy that looks plausible and escapes a sanity check.
What to do instead
Anchor the concept physically: grid distance is always shorter than ground distance for points above the ellipsoid, so ground = grid ÷ combined factor and grid = ground × combined factor. Compute the elevation factor as R/(R+h) with R ≈ 6,371,000 m and h the average ellipsoid height. Always state the direction in words in your scratch work before touching the calculator, and check that the result moved in the expected direction.
Confusing the roles of the horizontal and vertical axes of a total station or theodolite when reducing field observations, e.g., reading a zenith angle as an elevation angle or misidentifying which motion is the tangent screw versus the clamp.
Instrument nomenclature and angle conventions are learned hands-on, and candidates who studied from text alone conflate zenith (measured from vertical, 0–180°) with altitude (measured from horizontal, −90° to +90°). The arithmetic difference between the two conventions is exactly 90°, so the error silently propagates into every vertical reduction.
What to do instead
Memorize the definitions cold: zenith angle + altitude = 90°. When a problem gives a zenith angle, immediately write the equivalent altitude before computing slope or vertical distance. Build a one-page instrument reference covering circle conventions, clamp vs. tangent screw function, and face-left/face-right averaging, and rehearse it until recall is automatic.
Treating a level-loop misclosure as acceptable without comparing it to the allowable tolerance derived from the specified accuracy standard (e.g., 0.05 ft√M or a mm√km criterion), and failing to distribute the misclosure before reporting adjusted elevations.
Candidates compute the raw misclosure and stop, because the tolerance formula and the proportional distribution step feel like separate topics. The exam frequently supplies a closure standard in the stem and expects the candidate to both test it and, if acceptable, adjust the loop elevations proportionally to cumulative distance or number of setups.
What to do instead
Adopt a fixed three-step template for every leveling problem: (1) compute misclosure = observed − known; (2) compare |misclosure| to the allowable tolerance using the stated standard and the total loop length or setup count; (3) if within tolerance, distribute with opposite sign in proportion to cumulative distance (or setups) and report adjusted elevations. Write the tolerance formula at the top of your scratch page before starting.
Mixing units mid-calculation - feet and meters, degrees-minutes-seconds and decimal degrees, or chains and feet - and carrying the mixed value into the final answer without conversion.
Surveying problems legitimately mix unit systems (state plane in meters, field notes in feet; bearings in DMS, trigonometric functions in decimal degrees). Under time pressure, candidates convert the first quantity and forget the second, or convert at the wrong stage so rounding compounds.
What to do instead
Convert everything to a single working unit system in a labeled first step, before any trigonometry or coordinate geometry. Use the exact conversion factors (1 m = 3.28083333 US survey feet; 1° = 60′ = 3600″) and record them on your reference sheet. When converting DMS to decimal degrees, keep at least six decimal places and round only the final answer.
Choosing the wrong boundary evidence hierarchy - accepting a found monument over a written deed call, or ignoring an uncalled-for monument - instead of applying the accepted order of evidence (natural monuments, artificial monuments, lines of adjoiners, courses and distances, area).
Candidates learn the hierarchy as a list but cannot apply it when the fact pattern is ambiguous, especially when a monument conflicts with a distance call or when a monument is mentioned but not called for in the deed. The exam tests judgment about which evidence controls, not just recitation of the list.
What to do instead
Drill the controlling principle: monuments called for in the deed control over courses and distances; natural monuments control over artificial ones; lines of adjoiners control over area. When a monument is not called for, treat it as evidence of possession or intent rather than a controlling call, and explain the reasoning. Practice short fact patterns where two evidence types conflict and state which controls and why.
Reporting an area computed from unadjusted coordinates, or computing area by the wrong formula (using the sum of cross products without halving, or applying DMD/Double Meridian Distance signs incorrectly).
The coordinate (shoelace) method and the double-meridian-distance method both require careful sign handling, and candidates who memorize one formula often apply it to a figure traversed in the opposite direction, producing a negative area or a doubled value that they fail to catch.
What to do instead
Use the coordinate method as the default: A = ½|Σ(X_i·Y_{i+1} − X_{i+1}·Y_i)| with the traverse closed back to the first point. Traverse the figure consistently (clockwise or counterclockwise) and take the absolute value. As a check, confirm the area is plausible against a bounding rectangle, and confirm the sign convention by testing a simple known triangle.
Ignoring the distinction between geodetic and plane surveying assumptions - applying plane trigonometry to a long baseline or high-latitude problem, or failing to account for convergence of meridians and curvature when the problem specifies a large area.
Most textbook problems are plane-survey problems, so candidates default to plane formulas even when the stem explicitly gives a long distance, a large latitude span, or asks about grid azimuth versus geodetic azimuth. The curvature and convergence corrections are small but decisive when the question is designed to test them.
What to do instead
Read the stem for triggers: distances over roughly 10–12 miles, areas spanning degrees of latitude, or explicit mention of ellipsoid, geoid, grid, or convergence. When triggered, apply the appropriate correction (curvature and refraction for leveling/trig leveling; convergence = Δλ·sin φ for azimuth conversion). Otherwise state explicitly that plane assumptions are valid and proceed.
Overlooking the statutory and ethical layer - treating a boundary survey as purely a mathematical exercise while ignoring record-research obligations, mandatory filing or monumentation requirements, or the duty to disclose a discovered conflict rather than silently resolving it.
Candidates focus preparation on computations because those are objectively gradable, and treat professional practice as common sense. Exam items that embed an ethical conflict (a client asking to move a line, a discovered discrepancy with an adjoiner's deed, an unrecorded prior survey) require recognizing the affirmative duty, not just avoiding outright fraud.
What to do instead
Build a short ethics checklist: research the public record before fieldwork; disclose material discrepancies to the client and, where required, to affected parties; do not alter a boundary to satisfy a client; sign, seal, and file as statute requires; and document the basis of the boundary determination. For each practice question, identify the specific duty triggered and the required action, not just whether the conduct was 'wrong'.
Rushing the final step - selecting an answer that matches an intermediate result or a distractor computed with a common sign or unit error, rather than verifying the answer against the question asked.
Multiple-choice formats are engineered so that common errors appear among the options. A candidate who computes a value and immediately scans for it will find it, confirm the error, and move on without checking units, sign, or whether the question asked for a bearing versus an azimuth or an angle versus its supplement.
What to do instead
Reserve the last step of every problem for a verification pass: re-read the question stem, confirm the requested quantity and units, and check the answer's order of magnitude against a rough estimate. Where possible, back-substitute into the original equations. Treat any option that matches your intermediate value as suspect until verified.