Key takeaways
- A reclamation certificate is granted on assessment work done on the ground by qualified professionals. Drone data is supporting evidence in that file, never the assessment itself.
- Where aerial capture earns its place is the dated, measurable surface record: footprint, access, drainage, surface cover and how all of it changed between phases.
- The flights that matter most are the ones nobody books, because they happen before the disturbance and immediately after equipment leaves, when nothing looks worth documenting yet.
- Fly the same plan every time. A record that cannot be compared to the previous one is a photo album, not evidence.
- HEADS UP: this article describes the process directionally and points readers to the regulator for current criteria. It does not quote assessment criteria or thresholds, deliberately. If you want it to name specific criteria, that needs a review by someone who works these files.
Every so often a client asks whether a drone survey will help them get a reclamation certificate. The honest answer has two halves, and leaving out either one causes a problem later.
The first half: no. A reclamation certificate is granted on the strength of assessment work carried out on the ground by qualified professionals, against published provincial criteria. Soil, subsoil, contamination, vegetation composition and land capability are established by people with augers, pits, lab results and professional liability. No aerial sensor replaces any of that, and no operator should suggest otherwise.
The second half: yes, and more than most people expect. Reclamation files are built over years, often by staff who were not there at the start, and they are judged in part on a record of what was disturbed, what was put back, and what the surface did afterwards. That record is exactly what aerial capture is good at, and it is usually the weakest part of the file.
What the certificate actually turns on
In Alberta, reclamation certificates for upstream oil and gas sites are administered by the Alberta Energy Regulator, against criteria published by the province. The assessment work behind an application is done by qualified professionals, and the requirements are revised from time to time. Before you plan anything around this, confirm the current criteria and process with the regulator or with the consultant who will sign the assessment. Nothing in this article is a substitute for that.
What matters here is the shape of the thing. The decision rests on conditions measured at and below the ground surface, compared against a standard, and documented by someone accountable for the finding. An orthomosaic does not measure any of that. It sits alongside it.
Where aerial capture genuinely helps
There are five contributions worth paying for, and they all share a property: they are about the surface, they are measurable, and they are time stamped.
- The disturbed footprint, measured rather than estimated. Lease area, access road, borrow and spoil areas, remote sumps, lay-down and anything that crept outside the original boundary. Measured off a georeferenced surface, this is a number rather than a recollection.
- Surface cover and how far the revegetation actually extends. Not species identification, which is ground work, but extent, patchiness and where bare ground persists. Flown in the same part of the growing season each year, the change between captures is the useful part.
- Drainage, grading and erosion. A surface model shows where water is going, where a contour was left running the wrong way, and where rilling has started. These are the items that quietly turn into a rejected application or a return visit years later.
- Equipment, debris and infrastructure removal. A dated overhead record of a cleared site is simple, cheap and unarguable in a way that a memory from four seasons ago is not.
- Change between phases. This is the real product. Pre-disturbance, post-abandonment, post-contouring, post-topsoil, and then the growing seasons after. Each is unremarkable on its own and the sequence is the evidence.
What it cannot do, stated plainly
Being clear about this protects the file more than overselling the flight does.
- It does not assess soil. Not depth, not horizon reconstruction, not compaction, not salinity, not any of it.
- It does not detect contamination. Thermal and multispectral sensors respond to surface temperature and to how vegetation is reflecting light, and reading either as a contamination finding is not defensible.
- It does not identify species or assess land capability. Both are ground assessments by people qualified to make them.
- It does not see under canopy, under water or below grade, which is covered in more detail in our piece on the honest limits of aerial capture.
- It is not a legal survey. Boundaries, title and anything requiring a licensed surveyor's seal are a separate scope, which our article on who signs off drone survey data goes through.
The right framing on a file is that aerial capture documents surface condition and surface change, and that the assessment of what those conditions mean belongs to the professional who signs it.
When in the sequence to fly
The flights that carry the most weight are the ones nobody thinks to book, because at the time there is nothing interesting to look at.
- Before disturbance. The baseline that every later capture is compared against. Almost nobody has one. If a site is going in next season, this is the cheapest flight on the whole file and the only one that cannot be recovered later.
- Immediately after equipment leaves. Before contouring, while the footprint is still visible. This is the capture that settles arguments about what was actually disturbed.
- After contouring and topsoil replacement. The as-left surface, which is what the drainage and erosion question gets judged against for the next several years.
- Through the growing seasons that follow. Same window each year, so the comparison is real rather than seasonal noise.
- Before the application goes in. A current record, and a last chance to see a problem from above before an assessor sees it from the ground.
On a portfolio of sites this is much less expensive than it sounds, because the cost that dominates a drone visit is getting to the site, not the flying. Several sites in one area on one trip changes the arithmetic entirely.
What to ask for in the deliverable
A capture that cannot be compared to the next one is worth very little on a file that runs for years. Five things make the record durable:
- A stated coordinate system and vertical datum, held constant. Get this from whoever holds the site data before the first flight, not after the fifth. Our article on which coordinate system your survey should be in covers the choice.
- A stated ground sample distance and how accuracy was verified. Both belong in writing, not in an email thread.
- The flight plan itself, retained and reused. Same altitude, same overlap, same boundary. This is the single cheapest thing you can do to make years of captures comparable.
- Date stamps on everything, including the raw imagery. The date is half the evidentiary value.
- Clear ownership and retention terms. A file that outlives the consultant, the contractor and the drone operator needs the data to survive all three. Our piece on data ownership and retention covers what to write down.
The problem this actually solves
Reclamation files fail slowly. A site is abandoned, the people who worked it move on, the contractor who did the earthworks is no longer in business, and five years later somebody is assembling an application from a folder of scanned scale tickets and three photographs taken on a phone. The assessment can still be done, because it is done on current conditions. What is gone is the ability to show what was there before and what changed.
A georeferenced, dated surface record costs very little at the time it can be captured and cannot be created afterwards at any price. That is the whole argument, and it is worth making to whoever owns the closure budget rather than to whoever books the flights.