18.1 ALTA/NSPS, Topographic Maps, 3D Models, and Construction Reports

The January 2025 BPELSG Professional Land Surveyor test plan puts Mapping and Document Preparation at 16 percent of the 4-hour Prometric exam. This section teaches remaining Domain V professional activities 3 through 6 and 8: prepare and analyze 3D models (BIM, DTM, point clouds); prepare topographic maps from photogrammetry, field survey, LiDAR, GIS, UAS, and hydrography; prepare control maps or reports (local, geodetic, monitoring); prepare maps, plats, and exhibits (court, easement, ALTA/NSPS, boundary); and prepare construction reports (cut-sheets, plots, verification reports, quality assurance, ADA reports, form/pad certifications). Knowledge items C, D, N, O, T, BB, and CC ride with those products: ALTA/NSPS Land Title Survey related to State law; basis of control on maps; surveyor reports; digital terrain models; methods for topographic maps; depiction of physical evidence that may indicate unwritten rights; and easements, rights-of-way, leases, and other encumbrances.

Legal descriptions and State-regulated maps (Records of Survey, corner records, parcel and final maps) belong in Chapters 16 and 17. Independent OpenExamPrep teaching here is how a California licensee issues mapping products and construction documents. It is not a claim of Board approval, partnership, or official sponsorship.

ALTA/NSPS 2026 related to California law

This subsection is independent teaching of the published Minimum Standard Detail Requirements for ALTA/NSPS Land Title Surveys. OpenExamPrep is not affiliated with the American Land Title Association or the National Society of Professional Surveyors and does not claim their approval.

ALTA and NSPS adopted the 2026 standards (ALTA October 8, 2025; NSPS October 17, 2025). They are effective February 23, 2026. As of that date they supersede the 2021 ALTA/NSPS standards and all earlier ALTA/ACSM versions. The client request must specify that a "2026 ALTA/NSPS LAND TITLE SURVEY" is required and which optional Table A items, if any, are incorporated. A complete ALTA/NSPS Land Title Survey includes four pieces:

1. Fieldwork required by Section 5
2. A plat or map prepared under Section 6 showing fieldwork and its relationship to the Section 4 documents
3. Any Table A items the client requested
4. The Section 7 certification

Section 3.B is the California hook. Many states have statutes and administrative rules that regulate surveying. In addition to the ALTA/NSPS document, the surveyor must also meet applicable jurisdictional requirements. Where they conflict, the more stringent must apply. California still requires a Record of Survey when Business and Professions Code (BPC) 8762 is triggered (Chapter 17). California still requires monuments sufficient in number and durability under BPC 8771. California still requires name, license number, signature, and seal on final land-surveying documents under BPC 8761. Showing California Coordinate System values still pulls in Public Resources Code (PRC) 8815–8815.5. Delivering an ALTA plat does not waive those duties.

Section 3.D requires boundary lines and corners to be established or retraced under appropriate boundary law principles from the facts and evidence. Section 3.E then defines Relative Positional Precision (RPP) as the length of the semi-major axis of the error ellipse of the line connecting monuments or witnesses marking adjacent corners, at the 95 percent confidence level. The 2026 maximum allowable RPP is 2 cm (0.07 feet) plus 50 parts per million, based on the direct distance between the two corners being tested. RPP measures how precisely the surveyor monumented and reported the corners the surveyor decided were the boundary. It is not a substitute for those boundary-law decisions. A corner can have a tiny RPP and still be in the wrong place if the retracement used the wrong controlling monument.

Worked RPP check (teaching numbers, not a Board-published cut): two adjacent corners are 400.00 feet apart. Fifty ppm of 400.00 feet is 400 × 0.000050 = 0.020 feet. Maximum allowable RPP = 0.07 + 0.020 = 0.090 feet. If site conditions force a larger RPP, Section 6.B.x requires a note on the face of the plat explaining those conditions. The 2026 standards list four uncertainty sources—monument integrity, record ambiguity, occupation that differs from written title, and RPP—and say only RPP is statistically controllable.

Records, fieldwork, and what the 2026 plat must say

Section 4 expects a current title commitment or other title evidence satisfactory to the insurer, the current record description (or parent-parcel description for an original survey), and recorded easements that benefit or burden the property. If those documents are not provided, the surveyor must still do the research California statutes and administrative rules require, plus any extra research the contract negotiates. Chapter 5 already taught that a California preliminary report is an offer to insure, not an abstract. On an ALTA job that distinction still matters: you plot what the commitment and the public record show, and you tell the insurer if you find a recorded easement the commitment omitted (Section 6.C.viii).

Fieldwork that later appears on the map includes monuments found and set, rights of way and access, buildings, cemeteries, and water features. Two 2026 fieldwork rules are easy to miss on the exam:

• Section 5.C.i requires the character and location of evidence of possession or occupation along the perimeter, by occupants of the surveyed property and by adjoining properties, regardless of proximity to the perimeter boundary lines.
• Improvements (walls, buildings, fences) within five feet of each side of the boundary are located unless physical access is restricted; utility features on or within five feet, and utility poles on or within ten feet, are located under Section 5.E.iv.

Section 5.E.ii requires evidence of undocumented use (the standards’ heading uses “prescriptive easements” as the example class): roads, paths, utilities, locate markings with the source of the markings (and a note if unknown), and similar uses by someone other than the apparent occupants. Section 6.D.ii.(l) requires notation of parol statements by interested landowners or occupants as to title or boundary issues. Those notes are how unwritten-rights evidence reaches the plat. They are not a quiet-title decree. The 2026 standards repeatedly say to locate potential encroachments without expressing a legal opinion as to ownership or nature. California knowledge BB is the same idea on any map, not only an ALTA sheet: depict the fence, the worn path, the patio that crosses the record line. Do not stamp “adverse possession proven.”

Basis of control, encumbrances, and Table A

Knowledge D is basis of control elements and their relation to maps—basis of bearings and benchmark. On an ALTA plat, Section 6.B.iv requires the direction, distance, and curve data needed to compute a mathematical closure, a note if the record description does not close, the basis of bearings, and, where it differs from the record basis, the difference. Dimensions on the survey and in any new description must be horizontal ground dimensions unless otherwise noted. If CCS83 or CCS2022 coordinates appear, California adds statutory labels: PRC 8815 requires the suffix CCS27, CCS83, or CCS2022; PRC 8815.1 requires the CCS83 datum realization tag and epoch (decimal year to two places), for example CCS83 (2011) epoch 2010.00; PRC 8815.5 requires a mapping angle, combined grid factor, and the elevation used to determine that factor at least at one representative point. PRC 8816 still makes State Plane Coordinates optional. Using them is a mapping choice; once they are on the sheet, the notes are not optional.

Water as a title line gets a date of measurement, which attribute was located (top of bank, edge of water, high water mark), and a caveat that the boundary is subject to change due to natural causes (Section 6.B.vi). That is the same discipline a California hydrographic or tideland exhibit needs (Chapter 10 collected the field evidence; this chapter puts it on a product).

Knowledge CC is encumbrances on maps. Section 6.C.ii requires a summary of rights of way, easements, and other survey-related matters burdening the property from the title evidence. For each matter the summary states record information, whether it lies within or crosses the surveyed property, and which of these conditions apply: location shown; location cannot be determined from the record; no observed evidence at fieldwork; blanket easement; does not affect the surveyed property; limits access to an otherwise abutting right of way; documents illegible; or information that it may have been released. Deeds of trust and tax liens are title encumbrances that often are not plottable as lines; the consulting point is to avoid drawing a fake geometry for a blanket or non-locatable burden. Leases and appurtenant offsite easements appear when they are plottable and, for offsite appurtenant easements, when Table A Item 18 is selected.

Table A is optional. The 2026 note says the first twenty items may be selected, wording and fee are negotiable, and additional negotiated items are identified as 21(a), 21(b), and so on, with notes under Section 6.D.ii.(g). Do not invent Table A numbers. Items that commonly collide with California practice include Item 1 (monuments placed at major corners unless already marked—California monument law may still require setting even if Item 1 was not checked), Item 5 (vertical relief with source, contour interval, datum, originating benchmark), Item 11 (underground utilities from client plans and/or private locates, with the printed warning that lacking excavation the exact location cannot be accurately, completely, and reliably depicted, and that 811 requests from surveyors may be ignored), Item 19 (professional liability insurance in a stated minimum amount; certificate on request; not addressed on the face of the plat unless the jurisdiction requires it), and Item 20 (a table of observed potential encroachments and related physical conditions, still without a legal-opinion caption).

Section 7 requires only the specified unaltered certification, except as Section 3.B jurisdictional rules require. The certification names the 2026 standards, lists the Table A items included, and states the fieldwork completion date. Adding marketing language or a California “guaranteed boundary” sentence into that block is not a 2026 option.

Topographic maps, 3D models, and control products

Activity V.4 is a topographic map assembled from one or more sources. The product is the map, not the raw flight. Every source needs a source note, a control note, and an accuracy note a later user can test.

GIS is a source, not a license to skip field work. Chapter 5 already treated digital-data metadata. On a topographic map, copying a county contour layer without a source date, vertical datum, and RMSE or contour-interval statement is a 476(c)(11) problem waiting to happen (section 18.2). Photogrammetry and UAS still need ground control or a documented GNSS-IMU solution; Chapter 7 covered flight planning. This chapter’s exam move is the face of the map: contour interval, index contours, spot elevations, vegetation or building filters, and the control that holds the sheet to a named benchmark and basis of bearings.

Activity V.3 is prepare and analyze 3D models. A digital terrain model (DTM) is the ground surface after classification and breaklines. A digital surface model (DSM) includes canopy and rooftops. Delivering a DSM to a grading contractor as if it were a DTM is a product error, not a software preference. Point clouds (terrestrial, mobile, UAS, or airborne) are measurements. Analysis includes reduction, classification, extraction of lines and surfaces, and a terrain classification system the office can defend. Building information modeling (BIM) coordination uses the classified as-built cloud or extracted solids against the design model. The surveyor’s professional act is the geospatial location, the control, and the stated uncertainty of the extracted features—not clicking “accept” on an unweighted mesh. Chapter 15 treated DTM and point-cloud analysis; here the deliverable is a signed model or report with units, coordinate system, epoch, and a statement of what was classified as ground.

Activity V.5 is control maps or reports: local project control, geodetic ties, and monitoring. A local control map shows the points the crew will hold for construction or topo, the basis of bearings, the benchmark, the equipment, and closures. A geodetic control report that uses or establishes CCS83 values must meet PRC 8813.1 (field-observed statistically independent connections; two or more horizontal reference stations when the survey establishes CCS83 values on or after January 1, 2023) and, if an accuracy is claimed, an FGDC or FGCS published standard with the PRC 8813.2 residual packet. A monitoring report states epoch-to-epoch change, not a new fee title. If California Coordinate System coordinates appear on a Record of Survey, BPC 8771.5 still requires the control scheme from points of known coordinates. PRC 8817 allows new surveys after January 1, 2025 to be based upon CCS2022; it does not retire CCS83, and it does not make coordinates a substitute for record monuments (PRC 8814 and 8818).

Court, easement, and boundary exhibits (activity V.6 besides ALTA) are still BPC 8761 documents. Interim sheets say preliminary or for examination only. Final sheets bear signature, seal or stamp, and date, at least on the title sheet. A courtroom exhibit that relocates a line is still a land-surveying document. An easement exhibit that will be recorded or attached to a deed should be prepared so a later surveyor can retrace it; the description work itself is Chapter 16.

Construction reports: cut-sheets, QA, accessibility, pad and form certifications

Activity V.8 is the paper the contractor, inspector, and later buyer actually use. These reports are easy to treat as “just staking notes.” BPC 8761 still applies.

A cut-sheet (also called a staking report) is a table, not a novel. For each stake it reports station, offset, design elevation or coordinate, as-staked elevation or coordinate, and cut or fill. Worked teaching row: curb return station 12+48.00, offset 0.00 on the design line, design elevation 412.50 feet, as-staked elevation 412.48 feet, cut 0.02 feet. If the inspector later claims the curb was staked 0.20 feet high, the signed cut-sheet is the professional record. Chapter 8 covered field staking practice; this chapter is the issued report.

Verification and quality-assurance plots compare as-built points to design surfaces or to permitted lines. They state the tolerance from the project specifications or the contract, not from an unpublished Board millimeter. If a point is out of tolerance, the report says so. 16 CCR 476(e) (section 18.2) forbids misrepresenting completeness of documents submitted to an agency or to the client. A QA plot that omits the failed points is an incomplete document dressed as a clean one.

ADA reports on the test plan are construction-measurement products: running slope, cross slope, landing length, and similar as-built geometry the accessibility specifications use. The 2010 ADA Standards for Accessible Design state a ramp running slope shall not be steeper than 1:12. California building-code accessibility provisions (California Building Code Chapter 11B) may be the project’s stated standard instead of, or in addition to, the federal standards. The surveyor measures and reports. The surveyor does not issue a legal conclusion that the building “complies with the ADA.” Worked teaching check: design rise 30 inches at 1:12 needs 30.00 feet of run. Measured run 28.50 feet is 1:11.4, steeper than 1:12. The report shows the measurement, the stated standard, and the arithmetic.

Form and pad certifications state the as-built elevation of a form, footing, or building pad relative to design. Worked teaching check: design pad 100.00 feet, specification tolerance ±0.10 foot, measured 100.06 feet—within tolerance. Measured 99.82 feet—out of tolerance. The certification should name the datum, the benchmark, the date, and the points occupied. It should not silently convert a grid elevation to ground, or a different epoch, without a note.

All of these products share one mapping ethic: show the evidence, name the control, state the uncertainty, and do not let a title block imply a legal determination the surveyor did not make.