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Construction GNSS settings are ready for fieldwork only when they match the deliverable’s horizontal and vertical tolerances and have been checked against reliable control. Before collecting points, verify the coordinate system and correction source, confirm antenna height and pole setup, assess satellite conditions, and make an independent check measurement. A receiver’s precision estimate or an RTK solution label alone does not prove that a point is correct.
Use the checklist below to catch configuration errors before they become layout or as-built errors. The numerical thresholds cited from the Oregon Department of Transportation are construction-survey guidance, not universal requirements; the project contract and applicable specifications take priority.
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What accuracy does the construction deliverable require?
Start with the deliverable, not the receiver menu. Identify the required horizontal and vertical accuracy separately, then choose a receiver, correction method, observation procedure, and quality checks capable of meeting those requirements.
Accuracy requirements vary with the work. Esri gives examples ranging from damage-assessment points that may tolerate errors of about 10 feet to underground-pipeline management that may require a few centimeters. Those examples illustrate the range; they are not acceptance standards for every construction project. Confirm the project’s contract, survey specifications, and intended use before setting a tolerance.
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Also distinguish absolute accuracy from relative repeatability. Absolute accuracy is how close a point is to its correct position in the project coordinate system. Repeatability is how closely repeated observations agree with one another. A rover can produce a tight cluster of repeat measurements and still be offset if its base coordinates, datum, projection, geoid, or site calibration are wrong. A repeat observation is useful evidence, but it does not replace a check against known control.
Write down the tolerances and the acceptance method before field collection. For example, establish what evidence is required for a point—such as an independent check, repeated observation, or adjustment report—and whether horizontal and vertical limits differ. If the specification is unclear, resolve it before crews begin collecting detail.
Which coordinate and correction settings should you verify?
Check the project coordinate framework and the correction workflow together. A reliable GNSS solution in the wrong coordinate system, or one tied to incorrect base coordinates, can produce consistently misplaced construction points.
- Confirm the datum and projection. Load the project’s verified datum and map projection, including the correct zone or local grid definition where applicable. Make sure the field controller and the data-processing workflow use the same coordinate framework.
- Confirm the geoid model and height convention. Check whether the deliverable calls for ellipsoidal or orthometric elevations and whether the configured geoid model is the one specified for the project. Do not treat a plausible-looking elevation as proof that the vertical reference is correct.
- Verify base coordinates and setup. Use verified control coordinates. The American Society for Photogrammetry and Remote Sensing (ASPRS) recommends uploading verified NAD83 coordinates and ellipsoidal height, setting up the base on a stable, level location, and independently checking antenna height. Incorrect base-station data is a recognized source of RTK error.
- Verify any site calibration or localization. A site calibration establishes the relationship between global GNSS coordinates and the project’s local grid and elevations. Confirm that the calibration belongs to the active project and that its control and residuals meet the project’s requirements; do not assume the receiver’s global coordinates automatically equal the construction grid.
- Check the correction source and survey style. Make sure the controller’s survey style matches the connected receiver and the intended workflow. In RTK, base-station observations or corrections are sent to the rover, which calculates a position in real time. Confirm that the intended correction source is connected, the expected constellations are enabled, and the controller displays the solution state required by the project.
The GNSS survey workflow guidance describes RTK as a real-time process using base observations or corrections at the rover. The site-calibration explanation describes how calibration relates GNSS coordinates to local grid coordinates and elevations. These are related but distinct checks: an active correction feed does not validate a local transformation, and a valid calibration does not prove the base coordinates are correct.
What satellite and signal conditions are acceptable?
Review satellite geometry, satellite health, and the site’s sky view before accepting a point. A high satellite count alone is not enough: geometry and signal quality also matter, and obstructions or reflections can degrade the position.
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The Oregon Department of Transportation’s Construction Surveying Manual for Contractors (October 2025) specifies these construction-survey thresholds:
| Check | ODOT manual threshold | How to apply it |
|---|---|---|
| Receiver accuracy | ±0.02 feet ± 1 ppm or better | Use this as the cited manual’s receiver-accuracy requirement, subject to stricter contract requirements. |
| PDOP | No greater than 6 | Reject or defer observations when the geometry exceeds the stated limit or the project’s stricter limit. |
| Healthy satellites | At least four | Confirm the satellites counted are healthy and usable, not merely visible. |
| Elevation mask | At least 10 degrees | Check the configured mask against the field procedure and project requirement. |
These are source-specific thresholds, not a universal GNSS rule. Apply the project contract if it sets stricter limits or a different acceptance procedure. The ODOT guidance’s field elevation-mask threshold should not be confused with ASPRS’s recommendation for a base station: ASPRS recommends a clear, unobstructed view of the sky above a 15-degree elevation mask for base setup.
PDOP (position dilution of precision) describes how satellite geometry affects the position solution; lower values generally indicate more favorable geometry. Treat it as one quality indicator alongside the receiver’s estimated precision, solution state, healthy-satellite count, and actual check measurements. Follow the project’s settings and acceptance criteria rather than adjusting a mask or threshold simply to make a marginal observation appear acceptable.
How should you set up the antenna and pole?
Measure and enter the antenna height using the correct measurement method, then keep the antenna upright and stable while observing. A wrong height entry shifts the point even if the GNSS solution otherwise looks good.
- Measure the actual antenna height. Use the measurement reference and method required by the receiver and project workflow. Enter the measured value and units carefully; check whether the setup expects a vertical or slant measurement rather than assuming.
- Check the pole and bubble. Hold the pole as vertical as possible and keep its tip on the intended point. For measured placement, the manufacturer’s guidance recommends a survey range pole with a calibrated bubble for best accuracy. Inspect the bubble and pole before relying on them.
- Keep the setup stable. Avoid leaning the pole, letting its tip move, or allowing a loose tripod or base to shift during observation. Recheck the point and pole if the setup is disturbed.
- Wait for the required precision to converge. In obstructed conditions, allow extra time for the solution to stabilize before logging. Record only after the controller’s precision estimate and solution state meet the project’s criteria.
Guidance on achieving the best possible GNSS accuracy emphasizes entering the actual antenna height, carrying the receiver upright, keeping the pole vertical, and monitoring the precision estimate. A precision estimate is a useful signal, but it should be supported by control and independent checks.
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How do buildings, trees, and equipment affect GNSS?
Buildings, tree cover, vehicles, cranes, walls, and other reflective or obstructive surfaces can block or reflect satellite signals. This can worsen geometry, reduce usable satellites, or cause multipath—signals reaching the antenna after reflecting from nearby surfaces.
Before collecting a point, assess the sky view and nearby reflective surfaces. Where possible, move to a location with a clearer view while maintaining the intended point setup, or use a different survey method if the location cannot support reliable GNSS. RICS guidance recommends clear sky views where possible and identifies alternatives such as laser-distance and compass offsets for wooded or enclosed environments.
Do not force a point into the map just because the background appears convincing. If a known checkpoint appears displaced, investigate the coordinate reference, calibration, base coordinates, correction state, and local signal environment before continuing. A map display cannot establish that the GNSS observation is correct.
How can you prove the rover is accurate enough before leaving?
Use known control, independent checkpoints, and repeat observations to test the setup before and during detail collection. The check should be independent enough to reveal a bad configuration rather than merely repeat the same potentially incorrect assumption.
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- Collect independent checkpoints. Check points not used to create the calibration or set the base can help reveal coordinate or transformation problems. Record the differences and compare them with the horizontal and vertical tolerances.
- Repeat selected observations. Reobserve points when practical, particularly after a setup change or a questionable signal condition. Compare repeated positions and record the standard deviation or other required repeatability evidence.
- Check after loss of lock or reinitialization. If the rover loses lock, reconnects, or reinitializes, revisit a previously coordinated point and confirm it still meets the required check before resuming detail collection.
- Stop and investigate failures. If checks disagree beyond tolerance, do not average away the discrepancy or continue collecting as if the setup were sound. Verify the base, coordinate system, geoid, calibration, antenna height, correction source, and observation conditions, then repeat the check.
RICS notes that real-time systems can indicate whether data has been captured at a suitable precision before the surveyor leaves the site, while absolute accuracy still depends on appropriate control and checks. In practice, use the controller’s real-time indicators to make field decisions, and use independent control evidence to support the position’s relationship to the project grid.
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What metadata should you retain?
Keep enough information to reconstruct how each coordinate was produced and assess whether it met the project requirement. A coordinate without its reference system, observation conditions, and correction context can be difficult to defend or troubleshoot later.
Retain point identifiers; coordinate and angular/distance units; datum, projection, geoid, and calibration details; antenna height and measurement method; receiver and survey-style information; correction source and relevant correction settings; satellite count, DOP, estimated precision, and solution state where available; atmospheric conditions; and raw observation files. Include adjustment outputs and confidence regions when the workflow requires them.
The ODOT manual specifically calls for observation data, units, correction information, atmospheric conditions, and least-squares adjustment outputs with confidence regions. Follow the project’s record-retention requirements as well, including any required field notes, check-point records, and calibration documentation.
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A short pre-collection review helps catch configuration mistakes while they are still easy to correct. Confirm each item with the active project and field controller, not from memory.
- The horizontal and vertical tolerances and acceptance method are understood.
- The datum, projection, geoid model, and local calibration match the project.
- The base coordinates and base setup are verified, stable, and level.
- The intended correction source is connected and the controller reports the expected solution state.
- The required constellations are enabled and satellite geometry, health, PDOP, and elevation-mask settings meet the applicable specification.
- The antenna height is measured, entered in the correct units and method, and independently checked.
- The pole or tripod is stable, the antenna is upright, and sky visibility is suitable for the observation.
- Known control and independent checkpoints pass before detail collection begins.
- Metadata, raw files, and adjustment or confidence reports will be retained as required.
If any check fails, resolve it before logging construction points. The time spent confirming a coordinate framework or reinitialization check is less consequential than carrying a systematic offset through layout or as-built records.
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Frequently Asked Questions
Does an RTK fixed solution guarantee a correct construction point?
No. A fixed solution describes the rover’s real-time solution state, but it does not by itself establish that the base coordinates, local calibration, or project coordinate system are correct. Compare the setup with verified control and independent checkpoints.
Can I use GNSS under trees or beside a building?
Sometimes, but obstructions and reflective surfaces can block or distort signals, so the observation may not meet the project tolerance. If a suitable sky view is unavailable, consider an appropriate alternative such as a measured offset method rather than accepting a questionable GNSS position.
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Why can two repeated GNSS measurements agree but still be wrong?
Repeated observations can be consistently displaced when they share an error, such as incorrect base coordinates or a mismatched calibration. Repeatability tests consistency; checks against verified control provide evidence of position relative to the project framework.
Should the antenna height be entered as slant or vertical height?
Use the measurement type and reference point required by the receiver workflow and project procedure; do not substitute one for the other. If the method is uncertain, verify the instrument’s instructions and confirm the entered value before collecting points.
