Lurid X Aerial Inspections

Railroad Spur Site Model

The same single drone flight that produced the contour map and the grade compliance report — kept as a model you can walk, cut and interrogate, instead of a picture of one.

Client: Withheld
Site: Aggregate facility, southwestern U.S.
Extent: 21.3 acres · 3,364 × 318 ft
Source: RTK aerial survey, 0.15 ft surface model
Field time: One flight, under two hours on site
Datum: Local — lowest index contour = 100.00 ft

The corridor, in three dimensions

Drag to orbit · scroll to zoom · shift-drag to pan

Surface Vertical exaggeration 8× Findings

Plan workbench

Click anywhere on the surface to query it · drag to pan · scroll to zoom

Base Layers Contours Grade classes Excluded objects Assessed strip Stations Cross-corridor scale 1×

Station: —
Offset from line: —
Surface elevation: —
Surface slope: —
Running grade (50 ft base): —
Classification: Click the model

Cut a section anywhere along the pad

The station you choose drives both panels

Station 43 Section vertical exaggeration 12×

Cross-section at Sta 43

Cut straight from the surface model, across the full 318 ft corridor.

Centreline profile and running grade

Elevation along the pad centreline, and the longitudinal grade over a 50 ft base length against the 2% spec.

What the model already knows

Every figure below came out of this surface. The model is not a second opinion on the report — it is the thing the report was written from.

✓

Pass — the pad is within spec end to end

The running grade stays below 2% along the entire measured stretch. The steepest point is +1.90% at Sta 43, a short pull at the start; across the rest of the pad the grade is typically under 0.9%. End to end the pad rises 5.90 ft over 2,248 ft — a grade of 0.26%.

End-to-end grade

0.26%

5.90 ft rise over 2,248 ft

Steepest running grade

1.90%

spec is 2.00%

Pad area under 2%

99.94%

54,156 sq ft of 54,188 assessed

Check against ground control

0.7 cm

largest difference at either control point

Where the pad works hardest

The five steepest points, each at least 200 ft apart. All are within spec — use the station control above to go and look at any of them.

Station	Running grade	Reading

The 32 sq ft that classifies in the 2.0–2.5% band sits in two patches — Sta 36–44 and Sta 267–276 — both outlined on the plan by the 2% boundary line. Nothing on the pad reaches 2.5%.

Why this is a model and not a map

A contour sheet answers the questions you thought to ask when it was drawn. A site model answers the ones that come up on Thursday.

Any station, any section. The cross-section above is cut live from the surface at whatever station you pick — not from a set of sections chosen in advance. Every one of the 2,248 stations along this pad is already in here.
Every point carries its own number. Click anywhere and the model returns the elevation, the surface slope and — on the pad — the running grade and how it classifies. A marginal patch off to one side cannot hide inside an average.
The exclusions are visible, not buried. The 0.33% of the strip that was set aside as material or equipment is a layer you can switch on, so anyone can see what was left out of the assessment and decide whether they agree.
It stays useful after the question changes. The spec on this pad was 2%. When the next question is a different spec, a different alignment or a different corner of the yard, the flight does not have to be repeated.
One flight, many deliverables. The contour map, the grade compliance report and this model are three views of a single two-hour visit.

This is a photogrammetric model derived from aerial imagery. It is not a topographic survey and does not constitute the practice of land surveying. Contours and elevations follow the visible surface — vegetation, vehicles and stockpiles are included as ground, and the model is not bare earth. Elevations are on a local datum for publication. It shows where a surface meets a grade spec and where it does not; it does not replace a staked ground check.

Want your site kept as a model?

Grade compliance, stockpile volumes, contour mapping and progress documentation — RTK-flown, checked against ground control, with the accuracy stated on every drawing. Southwestern US.

bill@luridx.com · 602-639-1700