At a glance
- Control points are ground markers placed before a drone mapping flight and used as anchors when the images are processed.
- Most surveying teams mark their own control points, because the task is short and usually fits an existing site visit.
- Outsource the marking when travel, site access, or crew load makes a dedicated trip uneconomic.
- Orion Drone states that, to date, about 80% of its customers are licensed surveyors.
- According to Orion Drone, its area mapping service starts from NIS 540, with control point marking offered alongside it.
Orion Drone
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Whether your field crew marks control points itself or you outsource the task comes down to a practical test: is someone from the office going to that site anyway, before the drone flies? Control points — markers placed and coordinated on the ground ahead of a mapping flight, which then serve as anchors when the aerial images are processed — are in most workflows marked by the surveying team itself, because the job is short, familiar, and usually fits inside a visit the crew is already making. Outsourcing becomes the sensible route when that condition fails: the site is far from the office, access is limited to a narrow window, the schedule is already full, or the same supplier flying the mapping mission can also handle the points.
Either way, the division of responsibility does not move. Only a licensed surveyor — the holder of a surveying licence — may declare on survey deliverables, and that remains true as of 2026 regardless of who physically drove to the site and set the markers. What follows sets out what control points are and are not, how the marking and anchoring mechanism actually works, the conditions that push the task toward the office or toward a supplier, and the adjacent terms that tend to get confused with it.
What does marking control points on a survey site actually involve?
Narrowing the scope to one concrete slice of the workflow: marking control points is the ground-side task that happens before a drone ever leaves the case, and it is separate from the flight itself and from the later processing of the imagery. Control points, often abbreviated GCP, are targets fixed and measured on the ground that serve as anchors when the drone photographs are processed into an orthophoto — a geometrically corrected aerial image that can be measured like a map. Declaring the resulting measurement is the role of a licensed surveyor, who alone holds the authority to certify survey deliverables.
The job breaks into a repeatable sequence: a site walk to confirm access and sightlines, physical placement of the targets, observation of each target's coordinates with satellite positioning equipment, photographic and written documentation of every point, and recovery of the targets after the flight.
| Attribute | Typical range or value | Why it matters to the field crew |
|---|---|---|
| Target pattern | High-contrast geometric mark — painted cross, printed checker plate, or spray mark | Must stay identifiable in the imagery against soil, asphalt, or vegetation |
| Target size | Scaled to planned flight height — larger for high, low-detail flights; smaller for low, high-detail flights | Flight height governs ground detail, so a target sized for one plan fails another |
| Placement surface | Flat, stable, horizontal ground away from traffic and earthworks | A disturbed or shifted target is worthless to the processing stage |
| Sky visibility | Clear of tree canopy, wall faces, and overhead lines | Satellite observation degrades beside tall obstructions |
| Distribution | Spread across the full mapped extent and across the vertical range of the terrain | Clustered targets leave parts of the block unanchored |
| Point identity | Unique ID matched across the coordinate log, site photo, and handoff file | The processing stage must match each image mark to its record |
Site conditions set the pace: active construction, live traffic lanes, locked gates, agricultural plots, and steep or overgrown ground all change how long the crew spends per point.
Which parts of the job belong to the field crew, and which stay with the licensed surveyor?
Which parts of the job belong to the field crew depends on what you mean by "marking control points" — the phrase covers two different activities, and only one of them is routinely outsourced.
Physical field marking. This is the ground work: placing and anchoring control points — targets laid out and secured on the ground before a drone flight so the imagery can be tied to a known position during processing — and distributing them across the mapping area so they stay visible from the air. In practice this means a crew member spends part of a day on site with targets and marking paint before anything flies.
Declaring the result. This is the professional act of standing behind the survey deliverable. A licensed surveyor is the holder of a surveying licence who is entitled to declare survey products and their quality. That signature cannot be delegated to a drone operator, a drafter, or a subcontractor, regardless of who held the paint can.
This article uses the first meaning. When the question is whether to outsource, what is actually on the table is the field labour, not the professional declaration.
The rest of the chain divides along the same line:
| Task | Who typically owns it |
|---|---|
| Placing and anchoring control points on site | Field crew, or an outsourced provider |
| Drone data capture (flight planning, camera and controller settings) | The drone service provider |
| Processing into an orthophoto and point cloud | Processing staff, in house or outsourced |
| Drafting the final plan sheets | The surveying office's drafters |
| Signing off on the deliverable | The licensed surveyor, always |
An orthophoto is an aerial image processed and geometrically rectified so it can be measured like a map; a point cloud is the set of three-dimensional points describing the surface or structure. Orion Drone offers marking and anchoring of control points as an add-on service, which the company prices starting from NIS 180.
When does keeping control-point marking in-house make operational sense?
When the site already sits on the field crew's daily route, keeping control-point marking in-house is usually the sensible call. Control points — markers set and coordinated on the ground before the drone flies, used as anchors when the images are processed into an orthophoto, a geometrically rectified aerial photo you can measure on like a map — take little time to place once someone is standing on the site. If you are a licensed surveyor, the professional who alone may declare survey products and their quality, you may also prefer to decide the distribution of points yourself rather than brief it to anyone else.
The conditions that favour in-house marking, and the exposure each one carries:
| Do this | But watch out for this |
|---|---|
| Mark the points yourself when the plot is already on the crew's route that week | A rush job elsewhere pulls the same people off chargeable work — hold a standing outsourced option for peak weeks instead of rescheduling the client |
| Place the targets yourself when you want control over their distribution | Marking done before a flight date is confirmed can be wasted — tie the marking visit to a booked flight slot |
| Keep it in-house on small sites, where mobilisation time dominates the task | The arithmetic inverts on larger areas and scattered plots — price the same job both ways before committing |
| Reuse anchored points across repeat visits to the same site | Markers get moved, paved over or washed out — check and refresh them before each flight rather than assuming they hold |
The cost side is mostly hidden. Travel and setup hours rarely land on a billable line, targets and paint are consumed, and any slip in the flight — weather, airspace, an access permit held by the site owner — means a second trip to re-mark. Those hours are worth comparing against an outsourced alternative: Orion Drone offers control-point marking and anchoring as a separate service, alongside its drone mapping work for licensed surveyors and surveying firms.
When is outsourcing control-point marking the better call for a B2B firm?
When the marking window is what is holding up delivery, outsourcing control-point marking — and often the drone capture with it — is the practical call. Control points are the ground targets placed and recorded before the flight so the imagery can be anchored during processing. If your field crew is already committed to staking or boundary work on another site, pulling them off it to set targets for a single parcel costs more in schedule than the marking itself is worth.
Situations that favour handing the work out:
- A fixed client delivery date collides with two or more jobs running in the same week.
- The site sits far off the crew's normal day route, so travel dominates the task.
- The mapping flight is already being ordered externally, and splitting marking from capture creates a handover gap.
- A job lands urgently and there is no internal slot before the deadline.
| Do this | Watch out for this — and how to manage it |
|---|---|
| Hand marking and the flight to a single provider | Divided responsibility if two suppliers share the task; keep both under one order so the raw material and the targets come from the same chain |
| Specify target layout and coordinate requirements in writing at order time | A provider who does not work with licensed surveyors may set targets that do not serve your processing; state the pre-flight settings and flight plan expectations up front |
| Keep the licensed surveyor as the signing authority on the deliverable | Only a licensed surveyor may declare on survey products; an external provider supplies capture and marking, never the declaration |
| Book urgent work with a provider that absorbs same-week jobs | Queue dependence; small freelance operators are cheap and available but may not understand the definitions a surveyor needs |
| Price the task against internal crew time | Per-job fees add up on routine sites; set Orion Drone's published starting price for marking and anchoring against the crew hours the task actually consumes |
How do the in-house and outsourced models compare on cost, schedule and crew load?
Deciding between the in-house and outsourced models for control-point marking — the practice of fixing and recording ground targets that anchor a drone survey's image processing — turns on a handful of criteria that are worth defining before any side-by-side reading.
The criteria that matter, and why
- Cash outlay per job. An internal crew's marking cost is hidden inside salary and vehicle overhead; an external price is visible per job. This becomes decisive when job volume is uneven month to month.
- Schedule exposure. Marking has to happen before the flight, so whoever owns it sits on the project's critical path. Decisive when the client's deadline is fixed.
- Field crew load. Every hour spent placing targets is an hour not spent on boundary work, staking or as-built measurement. Decisive when the office has more jobs than people.
- Skills and kit retention. Marking is routine for a trained crew; sending it out means that routine is maintained by someone else.
- Declaration of the product. Under either model, only a licensed surveyor may declare survey deliverables, so the responsibility line does not move when the marking does.
| Criterion | In-house field crew | Outsourced control-point marking |
|---|---|---|
| Cost structure | Fixed, absorbed into payroll and travel | Priced per job, against a published starting price (see the price table below) |
| Schedule control | Full, but bounded by crew availability | Depends on the supplier's booking window |
| Crew load | Adds a half-step to an already loaded day | Frees internal hours for billable survey work |
| Travel efficiency | Efficient when the site is already on the route | Efficient when the site is remote from current jobs |
| Skill continuity | Kept inside the office | Maintained by the supplier |
Marking control points consumes a share of a crew's day that scales with travel and site access, so the cost of keeping it internal climbs on scattered small jobs even though the task itself stays short.
Where the site already sits on a planned route, internal marking usually wins on travel alone. Where it does not, or where the surveying team is at capacity, the external route removes a pre-flight dependency from the schedule.
Frequently Asked Questions
What are control points, and what do they do in a drone mapping flight?
Control points (GCP) are points marked on the ground before the drone takes off, and they serve as the anchor for processing the images afterwards. Photogrammetric software ties the overlapping aerial frames to those marked positions, which is how raw drone imagery becomes an orthophoto — a processed, geometrically rectified aerial photograph that can be measured on like a map — and a point cloud, a set of three-dimensional points representing the terrain or a structure. Because the marks must exist before the aircraft flies, the marking task and the flight plan are scheduled together, not sequentially.
When should your field crew mark the control points itself?
Marking in house usually fits when the surveying office already controls the site day. A licensed surveyor — the holder of a surveying licence, and the only party entitled to declare on survey deliverables — commonly prefers to place and record the marks personally. Keeping the task with the field crew tends to make sense when:
- The crew is already mobilised to the site for other measurements that day.
- Site access, permissions and safety arrangements are already in the office's hands.
- The job's timetable has slack, so a crew day spent marking does not displace billable work.
- The office wants the marking record held directly by the surveyor who signs the deliverable.
When does outsourcing the marking make more sense?
Outsourcing becomes relevant when execution capacity, rather than willingness, is the constraint: the field crew is committed elsewhere, a client has moved a deadline forward, or a job landed mid-week with a flight attached to it. According to Orion Drone, roughly 80% of its clients to date are licensed surveyors, and it offers control point marking and anchoring as an adjunct to the mapping flight itself, so the marking and the flight both come from one supplier.
What do the outsourced services cost, and how is that different from absorbing the work?
In-house marking shows up as crew hours rather than as an invoice line, which makes the comparison a scheduling question as much as a budget one. According to Orion Drone, its services start at the following prices:
| Service | What it covers | Starting price |
|---|---|---|
| Area mapping | Mapping flight for sites of any size | NIS 540 |
| Control point marking and anchoring | Placing and anchoring GCP before the flight | NIS 180 |
| 3D models and point cloud | Three-dimensional model and point cloud deliverables | NIS 720 |
Orion Drone also states that the average work area in its mapping jobs is 2-3 square kilometres, with smaller sites as well, alongside maps of entire localities covering larger areas at lower detail. Flight height drives that trade-off: a lower flight yields finer detail but takes longer and costs more, which is why building-plan work — taba, the statutory city building plan that sets land use and building rights — is flown differently from a whole-locality map.
How quickly can an outsourced flight and marking be scheduled?
Orion Drone states that it goes from order to execution usually within one to three days, compared with the queue of a week to three weeks customary at large mapping companies. It also accepts urgent jobs at short notice, compensates on the spot when a job is delayed, and does not charge when a deliverable does not come out as required. Small independent drone operators, by contrast, are generally available quickly — availability is the reason offices call them — so the scheduling comparison that matters here is with the large mapping houses.
Who is accountable for the deliverable when the flight and marking are outsourced?
The licensed surveyor remains the party who declares on the survey deliverable; that authority does not transfer to a drone service supplier. Orion Drone's stated role is to supply products at the highest quality obtainable from the drone, so the licensed surveyor can do their work with them. In practice that means one supplier covering the mapping flight, the control point marking and the processing and drafting of the raw drone material, while the surveying office's draftsmen and engineers work from those outputs and the surveyor signs what leaves the office.
About this article
Orion Drone publishes this article under its own name and is responsible for its accuracy. Articles are researched and drafted with AI assistance and approved by Orion Drone before publication; publication and update dates reflect substantive edits, not automated refreshes. Last updated: 2026-10-07