Progress Photos vs Orthomosaic

These two terms get used as if they mean the same thing, and they do not. Progress photos give you a dated visual record of how a site is changing. An orthomosaic gives you a measurable, top-down map of it. Both come off a drone, both are useful, and paying for the wrong one is a common way to overspend or come up short. Here is how to tell which the job needs.

Key takeaways

Progress photos are for seeing the site: dated, clear, and easy to share with owners.
An orthomosaic is for measuring the site: corrected so distances and areas are true.
Most projects need progress photos often and an orthomosaic occasionally.
Buying an orthomosaic when you only need a visual record is the usual overspend.

What progress photos do

Progress documentation is a set of clear, dated aerial images captured on a schedule, usually monthly. The point is a reliable visual timeline: what the site looked like on a given day, from angles the ground cannot show. When a subcontractor disputes what was in place last month, or an owner wants an update without a site visit, the dated set answers it.

This is the everyday workhorse of progress documentation. It is fast to capture, fast to deliver, and cheap enough to repeat every month without a budget conversation.

What an orthomosaic does

An orthomosaic is built differently. The drone flies a grid and captures hundreds of overlapping images, and software stitches them into one continuous top-down picture. The important part is the correction: the image is adjusted so distortion from lens and terrain is removed, and every pixel lands in its real-world position. That is what lets you measure off it. Area of a pour, distance between footings, position of a stockpile, all pulled straight from the image.

That processing costs more and takes longer than a set of photos. You are paying for measurement, so it only makes sense when you actually need to measure.

Side by side

Need	Progress photos	Orthomosaic
Dated visual record	Yes	Yes
Share an update with owners	Yes	Overkill
Measure area or distance	No	Yes
Track a stockpile or earthwork	No	Yes
Low cost, repeat monthly	Yes	Costlier
Fast turnaround	Yes	Slower to process

The pattern most sites settle into: progress photos every month for the visual record, and an orthomosaic at the milestones where someone has to pull a number off the site. You are not choosing one forever, you are matching the deliverable to the question you need answered that month.

Where the Viewer changes the math

A folder of dated photos is useful. The same photos inside a Viewer are far more useful, because now you can scrub the timeline and put any two dates side by side. That is what turns a documentation habit into a dispute-settling record.

Construct Viewer

Every flight on one timeline.

Dated progress captures land in the Construct Viewer, so you compare any two dates and settle what was in place, and when, in a few clicks.

See the Construct Viewer

Construct Viewer showing a construction site with a dated progress timeline

Common questions

Do I need an orthomosaic for construction progress?

Not always. If your goal is a dated visual record to settle disputes, update owners, and track the build, aerial progress photos do the job at a lower cost. You need an orthomosaic when you have to measure: area, distance, or position on the site. Many projects use progress photos monthly and add an orthomosaic only at key milestones.

What is an orthomosaic, in plain terms?

It is a single top-down image stitched from hundreds of overlapping photos and geometrically corrected so every pixel sits in its true location. That correction is what lets you measure real distances and areas off the image, which a normal aerial photo cannot do.

How often should we document a construction site?

Monthly is the common cadence for progress documentation, with extra flights before pours or covered work you will want on record. High-activity sites sometimes go every two weeks. The right interval is whatever matches how fast the site changes and how often you report to owners.

Get the right documentation for your build.

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