Types of land surveys: boundary, ALTA, topographic and construction
Key takeaways
- A boundary survey establishes legal property lines, while topographic and construction surveys describe and shape the land inside them.
- An ALTA/NSPS survey is a boundary survey built to a national standard, with extra items lenders and title insurers ask for.
- Surveyors determine property lines by combining deed research, recovered survey monuments and precise field measurement, not by GPS coordinates alone.
- Modern land surveying equipment centres on GNSS RTK receivers and total stations, supported by levels, tripods, prisms and data collectors.
- Consumer handheld GPS units are accurate only to a few metres, so they cannot be used to fix a legal boundary.
What is a land survey and what does it do?
A land survey is the measurement and documentation of a parcel of land: where its boundaries run, what stands on it and how its surface rises and falls. A licensed surveyor turns field measurements and legal records into a signed plan or plat that owners, lenders, designers and authorities rely on.
Land surveying is both legal and technical: it interprets deeds and evidence, and measures positions to centimetres or better.
What a land survey tells you depends on its type. A boundary survey answers "where does my property end?", a topographic survey answers "what is the shape of the ground?" and a construction survey answers "where exactly should this building go?"
What are the main types of land surveys?
Most land surveying work falls into a handful of property survey types, each defined by its purpose and deliverable. The three types most people mean are boundary, topographic and construction surveys, with the ALTA/NSPS survey as a specialised boundary survey for commercial property.
| Survey type | Main question answered | Typical deliverable | Common users |
|---|---|---|---|
| Boundary survey | Where are the legal property boundaries? | Plat showing lines, corners, monuments, encroachments | Owners, buyers, fencing and building permits |
| ALTA/NSPS survey | What affects title to this commercial site? | Detailed plat to national standard plus optional Table A items | Lenders, title insurers, commercial buyers |
| Topographic survey | What is the terrain and what features exist? | Contour plan, spot levels, features, utilities | Architects, civil engineers |
| Construction survey | Where must the design be built? | Stakes, offsets, grade marks, as-built records | Contractors, site engineers |
| Lot or plot survey | Where does the house sit within the lot? | Plot plan with setbacks | Permit offices, lenders |
| Subdivision survey | How will a parcel be divided? | Subdivision plat with new lots and easements | Developers, planning authorities |
| Control or geodetic survey | What are the precise reference coordinates? | Control network, coordinate list | Large projects, mapping agencies |
Many projects combine several kinds of land survey. A commercial land survey for a new development often starts with an ALTA survey, adds topography and ends with construction staking.
Boundary survey: how do surveyors determine property lines?
A boundary survey establishes the legal limits of a parcel by retracing the original survey from the best available evidence. Surveyors find property lines by weighing records and physical monuments, then measuring precisely between them.
- Research records. The surveyor collects the deed, the recorded plat, neighbouring deeds, earlier surveys and easement documents.
- Establish control. A GNSS RTK receiver or total station is set up on known points so every measurement shares one coordinate system.
- Search for monuments. The crew looks for iron pins, concrete markers, stones or other survey monuments called for in the records.
- Measure and compare. Recovered monuments are measured and compared with the record bearings and distances to detect disturbed or missing marks.
- Resolve conflicts. Where evidence disagrees, the surveyor applies the legal priority of evidence, which usually ranks original monuments above recorded distances.
- Mark the corners. Missing corners are reset with new markers, and survey lines may be flagged on the ground.
- Draw and certify the plat. The final plan shows property boundaries, monuments found and set, improvements and any encroachments.
This is why a legal boundary survey is more than GPS coordinates. Coordinates help retrace the lines, but the boundary itself is defined by the legal record and the evidence on the ground.
ALTA survey vs boundary survey: what is the difference?
An ALTA/NSPS Land Title Survey is a boundary survey performed to minimum standards set jointly by the American Land Title Association and the National Society of Professional Surveyors. It is mainly used for commercial property survey work in the United States, where lenders and title insurers need a consistent product.
What does an ALTA survey include?
Beyond the boundary, an ALTA land survey typically shows the following, depending on the agreed scope:
- Recorded and observed easements and rights of way
- Buildings, structures and their distances to the lines
- Access to public roads and visible evidence of use by others
- Encroachments in either direction
- Optional Table A items chosen by the client, such as flood zone, zoning setbacks, parking counts, utilities or topography
When is each survey used?
A basic boundary survey suits most residential sales, fences and permits. The ALTA vs boundary survey choice is usually made by the lender: commercial loans and title policies often require ALTA. Because of its added research and detail, an ALTA survey generally costs several times more than a basic boundary survey of a similar parcel.
Topographic and construction surveys for new construction
A topographic survey maps the shape of the land and its features, while a construction survey transfers a design back onto the ground. Together they form the land survey for new construction, from early design to final as-built checks.
The topographic survey records spot heights, breaklines, trees, buildings, kerbs, drainage and visible utilities, then generates contour lines. Our guide to topographic survey deliverables and equipment covers the workflow in detail. Some firms add a 3D property survey from a laser scanner when a surface model is needed.
Construction surveying starts with control points around the site. Crews then stake out building corners, grid lines, road centrelines and grades, and later check that what was built matches the design. Accuracy demands are tight, often at the millimetre-to-centimetre level, which is why total stations still dominate structural layout. See construction layout and stakeout with GNSS and total stations for typical methods.
Survey monuments, benchmarks and geodetic markers
Survey monuments are physical marks that fix a point on the ground so later surveys can find it again. Benchmarks are monuments with a published elevation, and geodetic markers carry precise coordinates in a national reference system.
Permanent survey monuments include iron pipes or rebar with plastic caps, concrete posts, brass or aluminium disks set in rock or concrete, and nails in pavement. Disturbing a boundary marker is an offence in many jurisdictions, which is why good survey markers and monumentation last for decades.
In the United States, many older brass disks were set by the US Coast and Geodetic Survey, the predecessor of today's National Geodetic Survey. Survey benchmark locations and datasheets for those marks can be searched online, and a surveyor can occupy a benchmark with a GPS receiver to check heights or tie a local job to the national datum.
What land surveying equipment do surveyors use?
Modern land surveying equipment is built around two instruments: GNSS RTK receivers for open-sky positioning and total stations for precise angles and distances anywhere. Levels, tripods, prisms and data collectors complete the kit.
| Land survey instrument | Typical accuracy | Best for |
|---|---|---|
| GNSS RTK receiver | About 1 cm horizontal, 2 cm vertical (typical) | Boundary corners, topo, control in open areas |
| Total station | Angles of 1"–5", distances of a few mm | Urban boundaries, layout, under canopy |
| Auto or digital level | About 1–2 mm per km double-run (typical) | Benchmarks, heights, drainage |
| Handheld GIS receiver | Sub-metre to centimetre, model-dependent | Asset mapping, not legal boundaries |
| Consumer handheld GPS | Roughly 3–5 m | Navigation only |
GPS for land surveyors means survey-grade RTK, not a hiking unit. A receiver such as our E1 GNSS RTK receiver tracks all major constellations with 1408 channels and IMU tilt up to 60°, so poles need not be levelled on every corner. Where a corner sits against a wall, the L1 Laser GNSS Receiver measures it without contact. For dense urban lots, a 2" instrument such as the TS1000 total station, with 2 mm + 2 ppm prism accuracy, is the usual tool. The surveying instruments list covers the full crew kit, and survey accessories such as tripods and tribrachs matter as much as the instruments.
What does a land survey look like, and how much does it cost?
A finished land survey is usually a scaled plat or map with a title block, north arrow, legal description, bearings and distances on each line, and symbols for monuments found or set.
Owners who need an existing survey can usually find one with the county recorder or land registry, the title company from their purchase, their mortgage lender, or the surveyor who prepared it. Some local authorities publish plats and parcel maps online, although parcel maps are approximate and do not replace a survey.
Land survey cost varies widely with parcel size, terrain, the quality of records and monuments, local regulations and survey type. Broadly, a basic residential boundary survey costs far less than an ALTA survey of a commercial site, and rural or wooded land costs more than an urban lot. Always ask local surveyors for a written land survey quote and scope.
Sourcing land survey tools for your firm
Survey firms equipping crews usually buy a GNSS base and rover pair, a total station and a set of accessories per crew.
Mars Geosystems supplies GNSS RTK receivers, total stations, theodolites and accessories with an MOQ of one unit, OEM branding from 10 units and a one-year warranty. Send your crew size and project types through our quote request page and we will suggest a matching kit.
Frequently asked questions
What are the three types of land surveys?
The three most common types of land surveys are boundary surveys, which establish legal property lines; topographic surveys, which map terrain, contours and features; and construction surveys, which stake out designs and verify what was built. ALTA/NSPS, subdivision, lot and control surveys are specialised variations used for commercial transactions, land division and large projects.
How do surveyors find property lines?
Surveyors find property lines by researching deeds, plats and earlier surveys, then searching the ground for monuments such as iron pins or concrete markers. They measure recovered marks with a total station or GNSS RTK receiver, compare them with the record, resolve conflicts using legal rules of evidence and set new markers where corners are missing.
Can I survey my own property with GPS?
You can locate approximate boundaries yourself using a parcel map and a phone, but consumer GPS is only accurate to a few metres and has no legal standing. A DIY property survey cannot settle disputes, support permits or move a fence line. Only a licensed surveyor using survey-grade equipment and record research can produce a legal boundary survey.
What does a boundary survey include?
A boundary survey typically includes the property's legal description, bearings and distances for every line, monuments found and set, the location of buildings and fences relative to the lines, visible encroachments, and recorded easements. It ends with the surveyor's signed certification and notes on the datum, basis of bearings and records used.
How do surveyors mark property lines?
Surveyors mark property corners with permanent monuments, most often iron rods or pipes with a plastic or aluminium cap stamped with their licence number. In paved areas they use nails, disks or drill holes. Lines between corners may be shown temporarily with wooden stakes, flagging tape or paint, which fade, while the corner monuments are intended to remain.
Where can I find a copy of my property survey?
Check the documents from your property purchase first, as the title company or lender often holds a copy. Then contact the county recorder or land registry, the local planning office, or the surveyor named on any earlier plat. Some jurisdictions publish recorded plats online for free, although private surveys are not always recorded.
What is the best GPS device for land survey work?
For land survey work, choose a multi-constellation GNSS RTK receiver that delivers centimetre accuracy using a base station or network corrections. Look for full-signal tracking, IMU tilt compensation, a long battery life and an IP67 or IP68 rating. Handheld recreational units are unsuitable because their typical accuracy of several metres is far too coarse for boundaries.
Need equipment for this work?
Tell us the job, the country and the quantity. An engineer replies with a configuration and price within one business day. MOQ is one unit; OEM is available.
