Drone surveys can produce several different types of output.
This is a good thing, because not every project needs the same information. But it can also create confusion when someone is trying to decide what to ask for.
Two of the most common outputs are orthomosaic drone surveys and aerial progress photography.
They sound similar because both are created from drone images. They can also both be useful on construction sites, earthworks projects and development sites. But they are not the same thing and they do not solve the same problem.
In simple terms:
- An orthomosaic drone survey is used when you need a clear, corrected, top-down site view that can be used as a practical reference.
- Aerial progress photography is used when you need clear visual updates that show what the site looks like at a point in time.
Both can be valuable. The important part is choosing the right output for the job.
This article explains the difference.
What Is an Orthomosaic Drone Survey?
An orthomosaic drone survey is created by flying a planned route over a site and capturing many overlapping images.
These images are then processed using photogrammetry software to create one large, corrected top-down image.
The correction matters.
A normal drone photograph contains perspective and distortion. The further features are from the camera, the more the angle of the photograph affects what you see. This is fine for visual updates, but it is not ideal if you need a map-like view.
An orthomosaic is corrected so that it can be used as a more consistent site reference.
This makes it useful for:
- reviewing the whole site
- comparing changes over time
- using as a CAD or GIS background
- planning haul roads and working areas
- creating site records
- supporting reports and meetings
If you need a more detailed explanation, this article explains the basics: What Is an Orthomosaic Drone Survey?
What Is Aerial Progress Photography?
Aerial progress photography is different.
It is not normally processed into a corrected map. Instead, it focuses on capturing clear aerial photographs or videos that show the site visually.
This can be very useful for:
- client updates
- monthly progress reports
- marketing material
- social media
- project records
- stakeholder communication
- before and after comparisons
Aerial progress photography is often easier for non-technical viewers to understand. A good aerial photograph can show the scale of a project, the progress of a build, or the overall condition of a site very quickly.
This is where drone photography is very strong.
A photograph does not always need to be measurable to be useful. Sometimes, the main requirement is to show progress clearly.
This is why aerial progress photography can be a very useful service for construction and development projects.
The Main Difference Between the Two
The main difference is the purpose.
An orthomosaic is more of a survey-style output.
Aerial progress photography is more of a visual communication output.
That does not mean one is better than the other. It just means they should be used for different reasons.
An orthomosaic is useful when the question is:
“What does the whole site look like from directly above, and can we use this as a reference?”
Aerial progress photography is useful when the question is:
“How can we show what is happening on site clearly and visually?”
The difference is subtle, but important.
If you are trying to discuss access routes, boundaries, work zones or completed areas, an orthomosaic may be best. If you are trying to update a client, show progress to stakeholders, or create project images, aerial progress photography may be enough.
When Should You Choose an Orthomosaic?
You should consider an orthomosaic drone survey when you need the site to be shown as one consistent top-down image.
This is especially useful when the output needs to be discussed, marked up, compared or used as a background.
Examples include:
1.) Site planning
An orthomosaic can help teams review haul roads, access routes, compounds, boundaries, working areas and constraints.
2.) Progress tracking
If you capture orthomosaics at regular intervals, you can compare the site from one date to another.
3.) CAD backgrounds
A georeferenced orthomosaic can be used as a background in CAD or GIS software.
4.) Earthworks records
An orthomosaic can be paired with point clouds or elevation data to support earthworks reviews.
5.) Project records
A dated orthomosaic gives a useful record of site conditions.
For projects where the whole site needs to be understood from above, orthomosaic drone surveys are usually the better choice.
Lichfield Survey Supplies also provides more information on its orthomosaic service page.
When Should You Choose Aerial Progress Photography?
Aerial progress photography is usually the better choice when the main aim is communication.
For example, you may want to show:
- the overall progress of a construction site
- the scale of a project
- a completed stage of works
- a before and after comparison
- work taking place on site
- a project update for clients or investors
Aerial progress photographs can be easier to use in presentations, newsletters, websites and reports. They are less technical than an orthomosaic and often more visually engaging.
This does not mean they are less valuable.
In many cases, clients and stakeholders do not need a map. They need a clear view of progress.
A good aerial photograph can do that very well.
Can You Have Both?
Yes, and often this is the best approach.
A single drone visit can sometimes capture both survey-style data and progress photography, depending on the site, the requirements and the flight plan.
For example, a construction site may need:
- an orthomosaic for planning and records
- aerial progress photographs for the client report
- short aerial video clips for a project update
- 360 drone panoramas for remote viewing
This is often a sensible approach because the site is already being visited and the drone is already being operated.
The important thing is to plan this before the flight.
An orthomosaic flight needs consistent image overlap, height and coverage. A progress photography flight may need more creative viewpoints, angles and compositions. These are not always the same flight.
So if both outputs are required, the drone survey should be planned to capture both properly.
You can view the wider range of drone survey services available from Surveyed By Drone.
What About 360 Drone Panoramas?
A 360 drone panorama is another useful output.
This sits somewhere between progress photography and a site walkaround. A drone panorama allows a viewer to look around the site from a fixed aerial position. This can be particularly useful for remote stakeholders, project managers or clients who cannot visit the site in person.
A panorama does not replace an orthomosaic. It does not give you the same corrected map-like view.
But it does provide a very easy way to understand the site visually.
If you want someone to explore the site from above, then 360 drone panoramas may be a good option.
Which Output Is Best for Construction Sites?
For construction sites, the answer often depends on who will use the information.
A site engineer may prefer an orthomosaic because it can be used as a practical site reference.
A project manager may prefer both an orthomosaic and progress photographs because one helps with planning and the other helps with reporting.
A client may prefer aerial progress photographs because they are easy to understand.
A commercial team may value a dated orthomosaic because it can help show what work had been completed at a certain point in time.
This is why it is worth starting with the question:
“What do we need the drone survey to help us do?”
If the answer is “understand, compare or measure the site”, then an orthomosaic may be best.
If the answer is “show progress clearly”, then aerial photography may be enough.
If the answer is “allow remote people to look around the site”, then a panorama may be useful.
What Information Is Needed Before Quoting?
Before quoting for either an orthomosaic or aerial progress photography, it helps to know:
1.) Site location.
2.) Approximate site size.
3.) What output is required.
4.) How the images or survey will be used.
5.) Whether this is a one-off visit or a repeat service.
6.) Any site access restrictions.
7.) Any known hazards or airspace considerations.
8.) The required timescale.
This information helps decide what is possible, how long the work may take, and which output is best suited to the project.
If you are unsure what you need, it is usually better to have a practical conversation rather than guess.
You can request a drone survey quote and provide the site details for advice.
For a straightforward orthomosaic flight, Lichfield Survey Supplies also has an option to book an orthomosaic drone flight online.
Do You Need Drone Surveys Covering the Midlands?
Surveyed By Drone is Midlands based and works on construction and land-based projects where practical.
For many clients, location matters because drone work is affected by site access, airspace, weather and the time needed on site. A local or regional provider can often advise quickly, plan efficiently and understand the practical requirements of construction sites.
If you need drone surveys covering the Midlands, the first step is to send through the site location, approximate area and the output you are hoping to achieve.
From there, it is usually possible to advise whether an orthomosaic, aerial progress photography, panorama or another drone output is most suitable.
Summary
Orthomosaic drone surveys and aerial progress photography are both useful, but they are not the same thing.
An orthomosaic is best when you need a clear, corrected, top-down view of the whole site. It is practical for planning, records, comparison and CAD backgrounds.
Aerial progress photography is best when you need clear visual updates for reports, clients, presentations or marketing.
On many construction projects, the best answer may be to use both.
The most important part is to decide what the drone output needs to achieve before the flight is planned.
If you need help deciding what is best for your site, Surveyed By Drone can help provide practical advice and suitable drone survey outputs.
Key Points from This Article
- Orthomosaic drone surveys and aerial progress photography are different outputs.
- Orthomosaics are corrected top-down images that can be used as practical site references.
- Aerial progress photography is useful for visual updates, reports and stakeholder communication.
- A 360 drone panorama can help remote viewers understand a site from above.
- Construction sites may benefit from using more than one drone output.
- The best output depends on what decision, record or communication the survey needs to support.
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