Cut & Fill Analysis
Know exactly how much material moved — not how much you think moved. BWM Geospatial Solutions measures the ground surface before and after earthwork and reports the difference, giving you defensible quantities for billing, progress payments, and design verification.
The Problem with Truck Counts
Most earthwork gets quantified by counting loads. It's fast, everyone does it, and it drifts. Loads aren't uniformly full. Material bulks up when you dig it and compacts when you place it, at ratios that vary by soil type and moisture. Nobody logs every load perfectly on a busy day.
By the time a dispute reaches a progress meeting, neither side has a measurement — both have an estimate, and the argument is about whose estimate to believe.
A cut and fill survey replaces the estimate with a measurement. We capture the ground surface at the start, capture it again after the work, and compute the volumetric difference. The result is what actually changed on the ground, independent of how it was hauled or logged.
What the Analysis Gives You
- Total cut volume
- Total fill volume
- Net material balance — how much needs to come in or go out
- Cut/fill heat map showing where material moved across the site
- Comparison against design surface, if you supply the design file
- Progress quantities for a defined pay period
How It Works
1. Baseline survey. We capture the existing ground surface before work begins, tied to ground control. If work has already started, we can baseline from your original topo or the last available survey.
2. Earthwork proceeds. Your crews work normally. We're not on site.
3. Follow-up survey. After the work — or at each pay period — we re-fly and capture the new surface.
4. Surface comparison and quality control. The two surfaces are compared and volumes computed. Every dataset gets reviewed by a person before it goes out; automated processing catches most problems but not all of them.
5. Report delivery. Volumes, cut/fill map, and the underlying survey data.
Accuracy
Volume accuracy comes down to surface accuracy, and surface accuracy comes down to ground control and sensor choice. With control established on a cleared, actively worked site, aerial measurement produces quantities suitable for progress payment and design verification.
Vegetation is the variable that trips people up. Photogrammetry measures the top of whatever it can see, including grass and brush, so a vegetated site reads high. On sites where that matters, we fly LiDAR instead — it captures ground surface through cover. See topographic surveying for how that works.
We'll tell you which sensor your site requires before we quote it.
Deliverables
- Cut and fill volume report
- Cut/fill heat map, color-coded by depth of change
- Digital terrain models for both surfaces
- Contour maps at your specified interval
- Cross sections along defined alignments
- Orthomosaic of the site
- Point cloud data on request
Who Uses This
General contractors — verifying subcontractor earthwork quantities before paying
Site and excavation contractors — documenting completed work for billing
Owners and developers — independent verification of what they're paying for
Civil engineers — confirming grading matches design intent
Landfills — airspace consumption and cell capacity tracking
Municipalities — public project quantity verification
What Drives Cost
Cut and fill work is quoted per project based on site size, how many surveys the schedule requires, whether LiDAR is needed for vegetation, and whether you want comparison against a design surface. Projects flown on a recurring pay-period schedule are priced per visit.
Call with your site size and pay schedule and we'll quote it.
Cut & Fill Surveys in New Jersey
BWM Geospatial Solutions provides earthwork verification for contractors, owners, and engineers throughout New Jersey and the surrounding region.