IA Land Surveyor common mistakes
IA Land Surveyor · Understand the traps and how to avoid them.
Treating a recorded plat, deed call, or monument as controlling without first checking whether the record itself is internally consistent and whether the monument was set by the original surveyor or by a later party.
Candidates memorize the hierarchy of evidence (natural monuments, artificial monuments, courses and distances, area) as a list and then apply it mechanically, skipping the threshold question of whether a given monument is an original corner or a subsequent replacement. Exam items often plant a later-set rebar or a deed that conflicts with the plat to test exactly this distinction.
What to do instead
Before assigning weight to any call, walk through three questions in writing: is this monument original or re-established, does the record description close and agree with itself, and is there a senior right or boundary line that governs. Practice with conflicting-record scenarios where the correct answer turns on provenance of the monument rather than on the general hierarchy.
Confusing the different standards of evidence for boundary location (preponderance versus clear and convincing) and the different roles of the surveyor as fact witness versus expert when a boundary dispute reaches litigation.
Iowa boundary cases and the board's rules on professional conduct are tested through scenario questions, and candidates who studied only measurement technique have no framework for the legal-procedure side. They answer based on what seems fair rather than on the evidentiary standard the question names.
What to do instead
Build a one-page table mapping each proceeding (quiet title, injunction, board complaint, criminal trespass) to its burden of proof, the surveyor's role, and the admissibility issues for survey evidence. Review Iowa boundary-case reasoning at the level of holding and rationale, not just outcome.
Mixing horizontal and vertical datums, or reporting coordinates without stating the realization, epoch, and projection, so that a computed position is off by meters or the wrong sign.
NAD83(2011) versus NAD83(NSRS2007) versus the planned modernized terrestrial reference frame, and NAVD88 versus a local assumed datum, appear in questions that look like simple coordinate lookups. Candidates who treat 'NAD83' as a single undifferentiated datum miss the offset and the epoch-dependence of the answer.
What to do instead
For every control problem, annotate the datum, realization, epoch, units, and projection on the sketch before computing. Practice converting between State Plane Iowa North and Iowa South and between geographic and projected coordinates, and state the realization explicitly in every answer you write.
Misidentifying or misordering the NGS accuracy standards (order and class for horizontal, and the vertical network order/class scheme) and applying a GPS-derived position as if it automatically satisfied a given order.
Candidates conflate the older triangulation-era order/class designations with modern GNSS-derived positional accuracy, and they forget that accuracy classification depends on the network design, redundancy, and check ties, not just on the equipment used.
What to do instead
Memorize the horizontal order/class accuracy ratios and the vertical order/class millimeter standards as separate tables, then work problems that ask what field procedure and redundancy are needed to claim a specific order. Note explicitly that a single RTK fix does not establish order-level control.
Carrying a misclosure forward into the adjusted coordinates without first checking whether the misclosure is within the allowable tolerance for the traverse type, and without identifying a blunder before adjusting.
Adjustment software will happily distribute a blunder across the whole traverse, producing plausible-looking coordinates. Candidates who trust the software output skip the diagnostic step of comparing angular and linear misclosure against expected precision and of looking for a single large residual.
What to do instead
Adopt a fixed sequence: compute angular misclosure, compare to the allowable based on instrument and number of angles, distribute angles, compute linear misclosure and precision ratio, then test each residual for a blunder before any coordinate adjustment. Work several examples where the correct answer is 'reject and re-observe' rather than 'adjust'.
Applying a scale factor, temperature correction, or sea-level reduction to the wrong quantity, or omitting one of them, so that a distance is off by tens of parts per million.
Each correction has its own trigger condition and sign, and exam items combine them. Candidates remember that corrections exist but not which measurement they attach to or whether they apply before or after the grid-to-ground conversion.
What to do instead
Write out the full reduction chain from observed slope distance to ground distance to grid distance, labeling each step with its formula and sign convention. Practice problems that give a raw observation and ask for the ground or grid distance, and check units at every step.
Treating the PLSS as a uniform grid and computing aliquot-part areas or corner positions without accounting for the specific township's history, including correction lines, standard parallels, and the fact that sections in the north and west tiers are often short or irregular.
Textbook diagrams show idealized 36-section townships, and candidates apply that geometry to real Iowa townships where the original survey was run under a particular set of instructions and where fractional lots and meander lines exist. The exam tests whether the candidate knows that the idealized model is not the record.
What to do instead
Work problems using actual plats or reconstructed township diagrams that include fractional lots, closing corners, and correction lines. Practice aliquot-part subdivision where the parent section is irregular, and always ask whether the description is by aliquot part, by lot, or by metes and bounds before computing area.
Restoring a lost corner by proportioning when the evidence supports a better method, or proportioning between the wrong pair of corners (for example, using the nearest found corners rather than the correct controlling corners for that corner type).
Proportionate measurement is the fallback, not the default, and the rules differ for lost interior, lost quarter-section, and lost meander corners. Candidates memorize 'proportion' as the answer without learning the conditions that make it appropriate or the correct endpoints for the proportion.
What to do instead
For each corner type, write the decision tree: what evidence to search for, what constitutes a lost versus obliterated corner, and which corners control the proportion. Drill with scenarios that give partial evidence and ask for the restoration method and the controlling corners.
Submitting a plat or subdivision design that ignores the jurisdiction's ordinance requirements for lot area, frontage, setback, floodplain, and stormwater, or that fails to show the required dedication and easement information.
Candidates focus on the geometry and drafting and treat the regulatory checklist as boilerplate. Exam items present a proposed subdivision and ask what must change before approval, and the answer turns on a specific ordinance or statutory requirement rather than on design preference.
What to do instead
Maintain a checklist keyed to Iowa subdivision and platting requirements plus typical local ordinance items, and run every practice plat through it. Include floodplain, easement, monument, and dedication notes in your standard plat template so omissions become obvious.
Answering ethics and Iowa statutes-and-rules questions from general professional intuition rather than from the specific rule text, especially on licensure exemptions, responsible charge, continuing education, and mandatory reporting of violations.
The board's rules contain specific definitions and thresholds that differ from what a reasonable practitioner would assume, and candidates who never read the actual rule text default to common-sense answers that are subtly wrong.
What to do instead
Read the Iowa administrative rules governing land surveying and the board's statutes directly, and build flashcards on the exact definitions of responsible charge, the exemption boundaries, the continuing education hour requirements, and the complaint process. For each practice question, cite the rule section that supports the answer.