Mapping & survey

Know the land before you buy it

A drone flight early in a land deal shows slope, drainage, tree cover and access across the whole parcel. It helps you decide whether to buy, what to design and what your surveyor, engineer and planner need to look at first.

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Where it fits

Cheap information, early

Land deals go wrong on things you could have seen from above: a wet corner that turns out to be a watercourse, a slope that eats half the buildable area, a stand of protected trees along the frontage, an access road that is steeper than the listing photos suggest. Walking the site shows some of it. A map of the whole parcel shows all of it at once, to scale.

A drone flight produces an orthomosaic (a measurable aerial photo), a surface model and, from that, a terrain model and contours. Where the site is wooded, LiDAR can reach the ground through gaps in the canopy, which photogrammetry cannot. The files are delivered by link as GeoTIFF, DXF and LAS or LAZ, so your consultants can load them straight into their own design and GIS software.

One thing a drone map is not: a legal survey. Property boundaries in British Columbia are established by a BC Land Surveyor, and every other province and US state has its own licensed surveyors. The drone gives you context and quantities. Your surveyor gives you the line.

How the work is done

From offer to rezoning

Pre-purchase flight

During the due-diligence period, fly the parcel for an ortho, rough contours and aerial photos of neighbours, access and views. Get the owner's permission to be on the land, and check airspace for the location.

Read the site together

Share the map with your civil engineer, planner and architect. Mark slopes, low areas, trees, rock, access and anything that looks like a watercourse.

Controlled topography

If the deal proceeds, fly again with ground control tied to your surveyor's datum, so the terrain model can feed concept grading and servicing studies.

Supporting studies

Arborist, geotechnical, environmental and traffic consultants each get the same base map, so their reports line up.

Rezoning and public process

Aerial context photos and, through our sister studio BDM3d Studios, renderings set into real site photography help council, staff and neighbours understand the proposal.

What goes wrong

Surprises a map would have shown

Buildable area smaller than expected

Steep ground, setbacks and protected areas cut the usable footprint after the price is agreed.

How we handle itSlope and contour mapping during due diligence, reviewed by your engineer before waivers. →

Drainage found late

A seasonal channel or a ponding low spot shows up in the first wet season, and with it environmental review and redesign.

How we handle itA terrain model shows flow paths and low points; fly after heavy rain if you can. →

Trees drive the design

Tree protection bylaws in many municipalities require arborist reports, retention plans and replacement trees.

How we handle itA canopy map and tree locations from the ortho give the arborist a base plan. They still assess each tree on the ground. →

Consultants on different bases

The architect uses one aerial, the civil engineer another, the arborist a sketch. Nothing overlays.

How we handle itOne project record, one georeferenced base map, shared with every consultant. →

Trees, water and rezoning

The rules that shape a parcel

Trees. Many Canadian municipalities, including several around Victoria and Vancouver, have tree protection bylaws. They typically protect trees above a trunk size or of certain species, and require permits and an arborist report before removal. A drone orthomosaic and canopy height model show where the trees are and how big the crowns are. Species, trunk diameter and health still come from an arborist on the ground.

Water. In BC, development near streams and wetlands can trigger the Riparian Areas Protection Regulation, which calls for an assessment by a qualified environmental professional. Other provinces have their own regimes, such as conservation authority permits in Ontario, and in the US federal and state wetland rules may apply. A terrain model helps a consultant see where water goes; it does not decide what is regulated.

Rezoning. A rezoning or development permit asks staff, council and neighbours to picture something that does not exist yet. Accurate site context helps: current aerial photos, heights and views from nearby streets, and massing placed on real terrain. Check your municipality's current process, since several provinces have recently changed how housing applications and public hearings are handled.

The rules that shape a parcel: Illustration

The people around the job

Who uses the base map

Land surveyor

They need from you: To set boundaries and control, and to know how drone data will be used.
You need from them: Legal survey, control points and their review of drone topography.
On the DroneLink record: Flights use their control; their legal survey stays the authority.

Civil engineer

They need from you: A terrain model for grading, servicing and stormwater concepts.
You need from them: Early advice on what is feasible.
On the DroneLink record: DTM and contours delivered as standard files for civil design software.

Planner or municipality

They need from you: Clear site context for staff reports and council.
You need from them: Pre-application feedback and the current application requirements.
On the DroneLink record: Aerial photos, orthos and renderings on real terrain. See developers.

Neighbours

They need from you: To understand height, views and traffic.
You need from them: Their trust, and no surprises.
On the DroneLink record: Honest visuals from real viewpoints. Fly respectfully and follow privacy law.

What to prepare

Before the first flight

Written permission from the current owner to enter and fly the land during due diligence.
The parcel boundary as a PDF or GIS file, even if it is only the title plan.
Your surveyor's control and datum, if they have been engaged.
The questions you need answered: slope, drainage, trees, access, views.
Known hazards: livestock, tenants, power lines, water.
Read preparing a site for a flight for access and airspace basics.

Questions

Can a drone survey replace a land surveyor?

No. A licensed land surveyor establishes legal boundaries and usually sets the survey control. Drone mapping adds dense topography and imagery, and works best tied to the surveyor's control and reviewed by them.

How accurate is drone topography for site design?

As general industry knowledge, drone topography with RTK or PPK positioning and ground control is typically accurate to a few centimetres on open ground. Accuracy drops under trees and in tall grass, where LiDAR or ground survey fills the gaps. See mapping accuracy.

Can a drone map show drainage on a property?

Yes. A terrain model shows slopes, flow paths and low points. It shows where water is likely to go, not whether a watercourse is regulated; that needs a qualified environmental professional.

Can a drone count trees for a tree bylaw?

A drone map shows tree locations and crown sizes, and gives an arborist a base plan. Tree bylaws usually need species, trunk diameter and health assessed by an arborist on the ground.

Do I need the owner's permission to fly a drone over land I want to buy?

Get written permission to enter and fly the property. Pilots also have to follow Transport Canada or FAA rules and privacy law, especially near neighbouring homes.

How long does drone mapping of a development site take?

A small parcel is often flown in one visit. Processing time depends on size, method and control. We confirm the schedule when we scope the job.

Is drone imagery useful for a rezoning application?

Yes. Current aerial photos and accurate terrain help staff and council understand the site and the proposal. Check your municipality's submission requirements.

Keep reading

For developers

Tell us about your site.

An address and what you need is enough to start. We reply with what it will take and when we can fly.