June 25, 2026
Drone Elevation Mapping for Field Drainage and Tile Planning
How a centimetre-grade drone elevation survey turns a wet, drowned-out quarter into a drainage plan a contractor can actually build to.
What It Is
Every farm has a quarter that drowns out in a wet spring — the low corner that stays black into June, the flat that ponds after every big rain, the slough margin that never quite dries. The hard part is not knowing the field is wet. The hard part is knowing, to the centimetre, which way the water actually falls, so that a drainage fix moves it somewhere useful instead of just shifting the problem.
A drone elevation survey answers that. Flying a field with an RTK-corrected drone captures thousands of ground-elevation points and turns them into a digital elevation model (DEM) — a continuous, centimetre-grade surface of the field. On top of that model, a drainage analysis derives slope, flow direction, flow accumulation, and pond/depression locations. The result is a map that shows where water sits, where it wants to go, and where a tile run or surface ditch will actually drain.
This is mapping, not application — it is a survey-and-analysis service, completely separate from any spray or spread work, and it is one of the most established legal uses of an agricultural drone in Canada.
Who It's For
Central Alberta grain and oilseed growers losing acres to water in wet years, anyone planning a tile-drainage project who needs a base elevation model before a contractor will quote, and growers weighing surface drainage (ditches, grassed waterways, land-forming) who want to see the water's path before they move dirt.
If you have a field where the same low spots flood, seed late, or fail to mature every wet year, an elevation map is usually the cheapest first step — it tells you whether the fix is a few hundred metres of surface drainage or a full tile system, before you spend on either.
How It Works
A drone drainage survey runs in four stages:
- RTK flight. The field is flown at altitude on a mapping grid with RTK (real-time kinematic) GNSS correction, which holds positional accuracy to the centimetre rather than the metre-plus of an uncorrected drone. Ground control points are tied in where centimetre-true vertical accuracy matters most. A drone mapping flight covers a large field in a fraction of the time of a walking survey.
- Build the elevation model. The overlapping imagery is processed into a digital surface model and a bare-earth digital elevation model (DEM/DTM) — the continuous ground surface the rest of the analysis runs on.
- Derive the drainage layers. From the DEM, the analysis produces contours, slope, flow direction, flow accumulation (where water concentrates), and depression/pond locations. This is what converts a pretty 3D surface into a drainage decision.
- Deliverables a contractor can use. Outputs typically include contour lines, a depth-to-drain / pond-depth map, and the elevation surface in a standard format (GeoTIFF, shapefile contours, or a point cloud) that a tile-drainage contractor's design software can ingest directly — so the survey shortens their design step instead of duplicating it.
The survey does not design the tile system itself; it produces the trustworthy base surface that a drainage engineer or tile contractor designs against, and that you keep as a record.
Key Dates
- Best survey window:Bare ground — spring before seeding or after harvest
- Tile-drainage service:UAV AG tile drainage planning
- Field mapping service:UAV AG field mapping
How UAV AG Can Help
For a drone drainage survey, UAV AG delivers the analysis, not just raw imagery:
- →An RTK-corrected flight with ground control where vertical accuracy matters, so the elevation model is trustworthy enough to design drainage against.
- →A processed DEM plus the derived drainage layers — contours, flow direction, flow accumulation, and pond/depression mapping — not just an orthophoto.
- →Deliverables in formats a tile-drainage contractor or drainage engineer can load directly into their design tools.
- →Honest scoping: if your field has obvious surface drainage that a ditch or grassed waterway solves, we will say so before anyone prices a tile system.
A Note From Us
An elevation map is the cheap part of a drainage project; the dirt and tile are the expensive part. Flying the field first means the expensive part is designed against real, centimetre-grade ground truth instead of a guess from the cab — which is the difference between drainage that pays back and drainage that just relocates the wet spot.
This is a mapping and survey service. It is separate from spreading and spraying, and unlike pesticide application by drone, it carries no PMRA question — it is squarely within what agricultural drones are used for in Canada today. For the spreading side of the business, see our note on granular vs liquid application.
Frequently asked questions
How accurate is a drone elevation survey for drainage work?
With RTK (real-time kinematic) correction and ground control points, a drone elevation survey reaches centimetre-grade accuracy — accurate enough that a tile-drainage contractor or drainage engineer can design against it. An uncorrected consumer drone is accurate only to a metre or more vertically, which is not good enough for drainage, so RTK is the part that matters.
When is the best time to fly a drainage survey?
On bare or near-bare ground — in spring before the crop is up, or after harvest. A standing crop hides the soil surface, so the elevation model would read the canopy, not the ground. Bare-ground timing gives the cleanest digital elevation model.
Does UAV AG design the tile system?
No. We produce the trustworthy base elevation model and the drainage analysis (contours, flow direction, flow accumulation, pond mapping). A tile-drainage contractor or drainage engineer designs the actual system against that surface. The survey shortens their design work rather than replacing it.
What formats do I get the survey in?
Typical deliverables are contour lines, a pond-depth / flow map, and the elevation surface as a GeoTIFF, shapefile contours, or point cloud — standard formats that drainage-design software can ingest directly. Tell us what your contractor uses and we will match it.
Is drainage mapping by drone legal in Canada?
Yes, without qualification. Aerial mapping and survey are established legal drone services in Canada and do not touch the PMRA pesticide question at all — that question only applies to spraying and applying product. Drainage mapping is purely a survey-and-analysis service.
Can the same flight give me other field data?
Often yes. The same imagery used for the elevation model can also produce an orthomosaic of the field, and a separate multispectral flight can map crop vigour (NDVI). If you want both, we can plan the flights together to save a mobilization.