Is GPS accurate enough for pad elevation surveys?

Yes. RTK GPS rovers achieve ±0.05 ft (0.6 inch) accuracy under good conditions, which is adequate for pad certification at ±0.10 ft tolerance. The key qualifier is "good conditions" -- RTK requires open sky with no obstructions above 15-30 degrees. Urban infill lots with mature trees, adjacent two-story structures, or canyon topography can degrade RTK accuracy significantly. For these situations, a total station is the appropriate choice.

What accuracy do I need for pad certification?

Most jurisdictions require pad elevations within ±0.10 ft of design. To reliably verify this tolerance, your measurement system should achieve ±0.03 ft or better accuracy. RTK GPS at ±0.05 ft is marginal for this -- you can do it, but there is less margin for error in your setup and data collection. Total stations at ±0.01 ft give you more confidence that your measurements are truly accurate enough to certify.

Can one person shoot pad elevations with a GPS rover?

Yes. Modern RTK GPS rovers are one-person instruments -- you carry the rover, walk to each shot location, wait for a fixed solution (typically 2-5 seconds with network RTK), and record the shot. No rod person required. This is the biggest productivity advantage of GPS over total stations. A one-person GPS crew can shoot 20-30 lots per day; a two-person total station crew typically 8-15 lots per day depending on lot complexity.

GPS Rover vs Total Station for Pad Elevation Survey

Updated May 2026 · 6 min read

Quick Answer

Should I use GPS or a total station for residential pad elevation surveys?

Use GPS rover for open subdivisions with clear sky — 20-30 shots/hour vs 5-10 with a total station, and GPS auto-records coordinates now required by many cities. Use a total station for urban infill with trees, structures, or canyon topography that degrades GPS accuracy. Keep both for mixed situations.

20-30 shots/hr

GPS speed

±0.01 ft

Total station accuracy

±0.05 ft

GPS RTK accuracy

GPS Rover Advantages for Pad Surveys

RTK GPS rovers have transformed pad elevation surveys for residential subdivisions. The one-person operation is the biggest advantage -- no rod person means lower labor cost and faster setup. A single GPS operator can shoot 20-30 lots per day in an open subdivision, compared to 8-15 lots with a two-person total station crew.

GPS also auto-records coordinates (northing, easting, elevation) with every shot, which is increasingly required by California and Arizona building departments. With a total station, you have to add a separate GPS coordinate step if the building department requires coordinates.

RTK accuracy with a good VRS network is ±0.05 ft horizontal and vertical -- adequate for ±0.10 ft pad tolerance but with less margin than a total station. Most RTK networks charge $200-500/month for subscription access.

GPS Rover Limitations

The critical limitation of GPS for pad surveys is sky obstruction. RTK GPS requires clear sky above approximately 15-30 degrees on the horizon. In practice, this means GPS loses accuracy or loses RTK lock entirely in:

Lots surrounded by mature trees (common in wooded infill developments)
Lots adjacent to two-story structures under construction
Canyon locations with steep topography blocking satellite geometry
Urban infill with tall adjacent buildings

When RTK lock is lost, the GPS falls back to SBAS or float solutions with accuracy degraded to ±0.3 ft or worse -- not acceptable for pad certification. You need to recognize when your GPS signal is inadequate and switch to a total station for those lots.

Total Station Advantages

Total stations work anywhere -- under trees, in urban canyons, in covered parking structures during commercial pad surveys, or on any lot regardless of sky view. Accuracy is ±0.01 ft for modern instruments, giving you ample margin for ±0.10 ft tolerance verification.

Total stations do not require network subscriptions -- your only ongoing cost is the instrument and the crew. For a company doing pad surveys exclusively, the total station may be more economical over time than maintaining RTK subscriptions.

Which to Choose

Open subdivision, clear sky: GPS rover every time. The speed and one-person operation outweigh the slight accuracy margin advantage of the total station.

Urban infill with trees or structures: Total station. Don't fight GPS multipath errors on lots where accuracy matters most.

Mixed subdivision: Keep both. Use the GPS rover for the open lots, the total station for the problematic ones. Most field crews do this naturally once they've been burned by a GPS failure on a critical lot.

Equipment

GPS rovers and total stations for pad elevation surveys -- Topcon, Trimble, Leica, and Spectra Precision instruments available.

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