2.2 Standards, ALTA, BLM, FEMA, and Accuracy

Why standards matter on the PS exam

Standards convert professional judgment into repeatable requirements. They define scope, required documentation, accuracy language, certification wording, and the evidence a surveyor must consider. On the PS exam, standards questions often ask what the surveyor must include, what is optional, what standard controls, or what information is missing from a deliverable.

NCEES states that standards listed for the PS exam are supplied electronically during the exam along with the PS Reference Handbook. The important exam habit is to use the specific standard and revision year supplied by NCEES when a question depends on a standard of practice. A locally preferred rule or an older standard may not receive credit if the question is anchored to the NCEES list.

The supplied-standard mindset

Use this decision table before answering a standards question:

ALTA/NSPS 2021: purpose and complete survey

An ALTA/NSPS Land Title Survey supports title insurance and commercial real estate due diligence. It is not just a boundary survey with an ALTA label. The 2021 standard describes a complete ALTA/NSPS Land Title Survey as including required on-site fieldwork, a plat or map showing the results and relationship to supplied or obtained documents, any selected Table A items, and the prescribed certification.

The standard requires written authorization and a request that specifies an ALTA/NSPS Land Title Survey. It also expects appropriate records, including the current record description, title commitment or other title evidence, current adjoiner descriptions where required, and recorded easements or covenants that benefit or burden the property.

Boundary work under ALTA/NSPS still uses boundary law and evidence. The 2021 standard explicitly separates measurement precision from boundary correctness. A survey can meet a tight relative positional precision and still be wrong if the surveyor ignored controlling evidence, occupation, adjoiner descriptions, or applicable boundary law.

ALTA/NSPS items to remember

Table A is optional scope, not automatic scope

Table A contains optional survey responsibilities and specifications. The exam trap is assuming that every Table A item is included in every ALTA/NSPS Land Title Survey. It is not. Table A items must be selected, negotiated, and authorized. Any negotiated changes or additional items should be identified and explained as the standard requires.

Examples: flood zone classification, vertical relief, zoning information, parking count, observed utilities, offsite easements, wetlands markings, and professional liability insurance are not automatically included just because the survey is an ALTA/NSPS survey. The client, lender, insurer, and surveyor should define them before fieldwork so that fees, access, data sources, and deliverables are clear.

BLM Manual and PLSS evidence

The BLM Manual of Surveying Instructions is central for Public Land Survey System (PLSS) retracement and restoration. BLM describes the 2009 edition as the most recent Manual and as guidance for original surveys and resurveys of public lands. It is strongest for official federal cadastral surveys, but its principles are also broadly important for surveyors working with PLSS evidence.

For the PS exam, distinguish evidence categories:

• Existent corner: the original position can be identified by direct evidence of the monument, accessories, record, or reliable evidence.
• Obliterated corner: the original monument is gone, but the position can be restored from collateral evidence such as accessories, testimony, occupation, or acceptable records.
• Lost corner: evidence is insufficient after a diligent search, so the position must be reestablished by approved proportionate methods.

A common exam trap is proportioning too soon. Proportionate measurement is a restoration tool for a lost corner after evidence fails. It is not a shortcut around a serious search for monuments, accessories, field notes, witness evidence, and accepted local evidence.

FEMA elevation certificate work

FEMA elevation work tests vertical discipline. The surveyor must know what elevation is being reported, what datum it is tied to, and what flood source or map controls the comparison. A FEMA Elevation Certificate can support floodplain management, flood insurance rating, or map change requests. That means datum mistakes and incomplete structure elevations can have regulatory and financial consequences.

Important FEMA concepts include:

• Base Flood Elevation (BFE): the regulatory flood elevation used for comparison in many zones.
• Lowest floor elevation: building elevation item used in many flood determinations.
• Lowest adjacent grade (LAG): lowest ground touching the structure, which can affect zone and compliance analysis.
• Vertical datum: elevations and BFE must be compared in the same vertical datum or converted with a documented source.
• Benchmark used: the certificate should identify the benchmark and vertical reference basis for the reported elevations.

If a scenario gives a building elevation in one datum and a BFE in another, do not compare the raw numbers. Convert or obtain compatible elevations first.

Accuracy standards: say what was tested

National accuracy standards give surveyors a way to report positional quality without vague claims like accurate or subfoot. The FGDC National Standard for Spatial Data Accuracy uses root-mean-square error (RMSE) and reports positional accuracy at the 95 percent confidence level. It also expects testing against independent, higher-accuracy positions where practical and documentation in metadata.

The U.S. National Map Accuracy Standards are older map-scale standards. They are still important in PS study because NCEES lists them and because topographic or planimetric map questions may refer to well-defined points, map scale, and tested point tolerances.

Accuracy reporting checklist

1. State the coordinate reference system, datum, realization or epoch when relevant, projection, units, and vertical datum.
2. State whether values are grid or ground and give any scale or combined factor used.
3. State the test method, check points, confidence level, and whether accuracy was tested or compiled to meet a standard.
4. Separate horizontal and vertical accuracy when both matter.
5. Match the standard to the deliverable: title survey, federal cadastral survey, flood elevation, geospatial dataset, topographic map, or control network.

Professional judgment point

Standards do not remove judgment. They tell the surveyor what minimum process or reporting is required. The surveyor still has to identify the governing scope, evaluate evidence, document assumptions, and apply the stricter applicable requirement when ALTA/NSPS, jurisdictional rules, client scope, or agency standards overlap.