Houston, TX & the I-10 corridor

Drone Topographic Mapping in Houston, TX

Developers, builders and engineers on the Houston side need terrain data for tracts that nobody can see into: pine regrowth, yaupon and tallow thick enough that a ground crew has to cut lines for days before a single shot is taken. We fly drone LiDAR over those tracts east of Houston, along the Interstate 10 corridor through Chambers and Liberty counties and on into the Golden Triangle, and the deliverable is control-checked terrain data your licensed Texas surveyor can review and seal.

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16
returns per laser pulse, for terrain under dense brush
Seal-ready
control-checked data for your licensed Texas surveyor to review and seal
A few cm
vertical accuracy in open ground, checked against ground control
I-10
corridor from Beaumont west through Chambers and Liberty counties

Drone Topographic Mapping

What This Is and Who It Is For

A topographic survey on wooded Gulf Coast ground usually starts the slow way. A crew cuts sight lines through the brush, walks the tract with a rover, and shoots points where it can get to them. On a few hundred acres of thicket that takes days, and the gaps are wherever the brush won.

Aerial LiDAR takes the brush out of the equation. The scanner fires hundreds of thousands of laser pulses a second, and the pulses that slip through gaps in the canopy come back off the dirt. Classified and filtered, those ground returns become a bare-earth terrain model of the whole tract, not just the parts a crew could reach: ditches, old channels, low spots, berms, and the drainage paths that decide where a pad, a road or a detention pond can go.

What You Get

  • Seal-ready topographic data for your licensed Texas surveyor
  • Bare-earth surface, contours and breaklines
  • Drainage paths, low spots and spot elevations
  • Ground control and independent checkpoints
  • CAD-ready data for your engineer
  • Option to clear, grade and re-fly the tract
That matters more on this ground than most. The coastal plain between Houston and Beaumont is flat enough that a few tenths of a foot decides where water goes, and Harvey showed the whole region what happens when that is guessed at. Engineers designing drainage, fill and detention need real elevations under the trees, and they need them early.
We are clear about who does what. We fly, process and classify the LiDAR and imagery. The topographic survey itself, the part with a seal on it, is prepared and sealed by your licensed Texas surveyor, who reviews our data and control and takes responsibility for the result. We fly and process; we do not practice surveying. You get drone speed and a survey you can build on. Because we are also a land clearing and excavation company, we can clear the tract after it is mapped and fly it again, so the before and after come from one crew.

How It Works

From First Call to Delivered Data

  1. It starts with what the survey is for: a feasibility look, drainage design, a pad and road layout, or volumes for fill. That sets the accuracy, the flight height and how much ground control is needed.

  2. Ground control points and checkpoints are set and measured with survey-grade GPS so the LiDAR ties to real coordinates and can be checked independently. We fly the tract, then classify the point cloud into ground and non-ground, and build the bare-earth surface, contours and breaklines. Your licensed surveyor reviews the control, the checkpoints and the surface, adds anything that has to be measured on foot, and prepares and seals the survey.

  3. You receive the surface, contours and control report in formats your surveyor's and engineer's CAD and design software can use, ready for the seal.

The Equipment

What We Fly for This Work

Terrain under canopy is flown with a DJI Matrice 400 carrying a Zenmuse L3 LiDAR scanner, which records up to 16 returns per laser pulse. More returns per pulse is what gets ground points down through dense understory instead of mapping the top of the brush. A 100 MP mapping camera flies in the same pass, and a DJI D-RTK 3 base station ties the data to real coordinates.

Aircraft

DJI® Matrice 400

Aircraft

Flown for: Canopy mapping, thermal and storm flights on private and development land

Show specs (8)
Flight time
Up to 59 min (with H30T, 10 m/s, no wind)
Max takeoff weight
15.8 kg (34.8 lb)
Max payload
6 kg (13.2 lb), third connector, sea level
Weather rating
IP55
Wind resistance
12 m/s (27 mph), takeoff and landing
Operating temperature
-20° to 50° C (-4° to 122° F)
RTK positioning
1 cm + 1 ppm horizontal, 1.5 cm + 1 ppm vertical
Max speed
25 m/s (56 mph), no wind
Payload

DJI® Zenmuse® L3

Aerial LiDAR scanner

Flown for: Terrain under dense brush: bare earth, contours, drainage and volumes

Show specs (8)
Laser
1535 nm
Returns per pulse
Up to 16 (at 100 and 350 kHz)
Pulse rates
100 / 350 / 1000 / 2000 kHz
Detection range
950 m at 10% reflectivity (100 kHz)
Accuracy at 120 m
3 cm vertical, 4 cm horizontal (RMSE)
Accuracy at 300 m
5 cm vertical, 7.5 cm horizontal (RMSE)
Mapping camera
100 MP, 4/3 CMOS
Weather rating
IP54
Payload

DJI® D-RTK 3

Base station and GNSS rover

Flown for: Ties every DJI flight to real, checkable coordinates

Show specs (5)
Rover accuracy (RTK fixed)
0.8 cm + 1 ppm horizontal, 1.5 cm + 1 ppm vertical
Base accuracy (network RTK calibrated)
1.0 cm + 1 ppm horizontal, 3.0 cm + 1 ppm vertical
Run time
7 hr as base · 10 hr as rover
Weather rating
IP67
Operating temperature
-20° to 55° C

Specifications are the manufacturer's published figures under the manufacturer's test conditions, from enterprise.dji.com, store.freeflysystems.com and gremsy.com, checked September 2026. Flight times carry their conditions on purpose: the Astro Max's 43 minutes is the bare aircraft, and a heavy sensor cuts it to 20. The Astro Max LiDAR payload is not listed because it is not settled; its figures go up when it is. Accuracy on a real job depends on canopy, ground control, weather and flight plan, and what we deliver is mapping data, not a survey. DJI, Matrice and Zenmuse are trademarks of SZ DJI Technology Co., Ltd.; Freefly and Astro are trademarks of Freefly Systems; Gremsy and VIO are trademarks of Gremsy. TRP Land Clearing & Excavation is not affiliated with or endorsed by any of them.

Why TRP

Why Hire a Clearing Company That Flies

We clear this kind of ground for a living, so we know what a thicket does to a survey, and we know what the data is for because we are usually the ones about to put a dozer on it.
The survey is sealed by your licensed Texas surveyor. Nobody is practicing outside their license, and you get one point of contact from flight to delivered data.
We work east of Houston and along the Interstate 10 corridor through Chambers and Liberty counties, and the same crew can clear, grade and re-fly the tract after the survey.

From thicket to subdivision

One Tract, Scanned, Designed, Cleared and Built

LiDAR is not a separate service bolted onto land clearing. It is how a wooded tract becomes a property you can sell lots on: the scan feeds the design, the design drives the clearing, and you see the finished layout before the first tree comes down.

  1. Aerial photo of a densely wooded tract in Hardin County, Texas, solid canopy with no ground visible
    1

    The thicket

    What most raw land here looks like: pine regrowth, yaupon and tallow so thick nobody can see the ground, let alone where the water goes.

  2. LiDAR bare-earth elevation of the same tract showing a ridge of high ground and a branching drainage network
    2

    Scan it with LiDAR

    One flight takes the trees off. The bare-earth model shows the ridge, every drainage channel and the low ground, with no sight lines cut.

  3. Contour map of the tract with an illustrative road, lots, greenbelt and detention pond drawn to fit the terrain
    3

    Design on the real ground

    Contours go to the surveyor and engineer. Roads and lots go on the high ground, drainage follows the channels, detention sits at the natural low.

  4. The same aerial photo with the illustrative subdivision layout overlaid: lots, road, greenbelt and pond
    4

    See it before a tree is cut

    The proposed layout drawn over your own aerial. Owners, buyers and lenders see the finished property before a machine moves.

  5. Dozer clearing a wooded tract in Southeast Texas
    5

    Clear to the plan

    We clear, mulch and grade exactly what the plan calls for. The greenbelt stays standing, and nothing gets cleared twice.

  6. LiDAR elevation of the tract with the plan outline overlaid, representing an as-built check
    6

    Fly it again

    A second flight checks grades and measures what was moved against the design, so the before and after come from one crew.

Real ground, illustrative plan: a wooded tract near Lumberton, Hardin County, from USGS 3DEP LiDAR and NAIP aerial imagery (public domain), rendered by TRP. The subdivision layout is drawn to show the method. It is not a real plan and not a TRP project. Surveys and engineering are prepared and sealed by licensed professionals.

How LiDAR works

How does drone topographic mapping work?

A LiDAR scanner on the drone fires hundreds of thousands of laser pulses a second. Each pulse can bounce back several times: off the top of a tree, off branches, and, through the gaps, off the ground. The scanner records every return with its exact position.

Back in the office, the returns are classified. Everything that came off trees, brush and buildings is set aside, and the ground returns become a bare-earth surface of the whole tract. From that surface come the contours, spot elevations, drainage lines and volumes an engineer designs from, and the licensed surveyor checks it against measured control before sealing the survey.

The example here is real public LiDAR data from Hardin County, north of Beaumont. It is not our flight, but it is the same kind of ground, and it shows exactly what a thicket hides.

Diagram: laser pulses from a drone return from treetops, from branches, and last from the bare ground under the brushAerial LiDARhundreds of thousands of pulses a secondFirst return: treetopsMiddle returns: branches, brushLast return: bare groundlow spot hidden by brush
Diagram: each laser pulse returns several times. The first returns hit the canopy; the last ones reach the ground through the gaps.
Diagram: on the left an aerial photo shows only treetops; on the right the LiDAR bare-earth model of the same tract shows contours, an old ditch and a low spotWhat a photo seestreetops onlyWhat LiDAR deliversground, old ditch, low spot
Diagram: the same strip of land as a photo sees it, and as the bare-earth surface once the vegetation returns are filtered out.
Aerial photo of a wooded tract near Lumberton in Hardin County, Texas: solid tree canopy with a few clearings and homesWhat the camera sees
LiDAR bare-earth elevation of the same tract, showing a branching network of drainage channels, old ponds and road beds hidden under the treesWhat LiDAR shows

Real Southeast Texas example, about 2 km across, near Lumberton in Hardin County. The photo shows nothing but trees. The LiDAR of the same ground shows what is under them: every branching drainage channel, the old ponds and the road beds. Blue-green is low ground, tan is high.

USGS National Map: 3DEP LiDAR elevation and NAIP aerial imagery (public domain). Rendering by TRP. Not a TRP project.

Contour map of the same Hardin County tract generated from LiDAR bare-earth elevation, half-meter contour lines with heavier lines every two and a half metersContours from the bare earth

The same ground as contours: a line every half meter of elevation, a heavier line every two and a half. This is the kind of surface a surveyor and an engineer design drainage, pads and roads from.

USGS National Map: 3DEP LiDAR elevation and NAIP aerial imagery (public domain). Rendering by TRP. Not a TRP project.

TRP Land Clearing & Excavation

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Drone Topographic Mapping FAQ

Is a drone topographic survey as accurate as a ground survey?
For terrain across a whole tract, drone LiDAR with proper ground control is typically accurate to within a few centimeters vertically in open ground, and it measures far more of the surface than a ground crew can reach. Under very dense brush, fewer pulses reach the ground. The licensed surveyor checks the result against independent checkpoints before sealing it.
Who seals the survey?
Your licensed Texas surveyor. They review our data, control and checkpoints, add any measurements that have to be taken on foot, and prepare and seal the survey. We fly and process the aerial data; if you do not have a surveyor yet, we can point you to ones we work alongside.
Can you map land that has not been cleared yet?
That is exactly what this is for. LiDAR records multiple returns from each laser pulse, and the last returns often reach the ground through gaps in the canopy, so you get terrain under the trees without cutting sight lines first.
Is this a boundary survey?
No. A topographic survey shows the shape and elevation of the ground. A boundary survey locates property lines and corners from deeds and records, and it is separate work done by a licensed surveyor.
How far do you travel?
We work from Beaumont west along the Interstate 10 corridor through Chambers and Liberty counties toward Houston, and across the Golden Triangle. For large tracts further out, call and ask.

Karl Gillihan, Owner

TRP Land Clearing & Excavation

Updated September 2026

TRP Land Clearing & Excavation

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