More Than Just Drone Photography
When most people think about drone surveying, they picture a drone flying overhead taking photographs. While that is part of the process, the images are only the beginning. At Eagle Surveying, Aerial Photogrammetry is one of the primary technologies our Reality Capture Department uses to document existing site conditions. By combining aerial imagery with advanced processing software and traditional surveying principles, we create accurate datasets that support engineers, developers, contractors, municipalities, and landowners. Whether mapping a commercial development, documenting construction progress, or collecting data for design, photogrammetry allows us to gather large amounts of information efficiently while maintaining the accuracy our clients expect.
“Our goal is not simply to fly a drone. It is to deliver accurate, useful data that helps our clients make better project decisions.” — Keith Christensen, Director of Reality Capture Operations
What Is Photogrammetry?
Photogrammetry is the process of creating accurate measurements and three-dimensional models from overlapping photographs. Using drones equipped with high-resolution cameras, our field crews collect hundreds or even thousands of images along carefully planned flight paths. Specialized software identifies common features between overlapping images to reconstruct the site in three dimensions. From a single dataset, we can produce orthomosaic imagery, digital surface models, contours, earthwork calculations, three-dimensional site models, and other deliverables used throughout planning, design, and construction.
How Eagle Surveying Uses Aerial Photogrammetry
Every successful project begins long before the drone leaves the ground. Our team evaluates the project's goals, required accuracy, site conditions, and expected deliverables before developing a flight plan that accounts for image overlap, flight altitude, survey control, weather, lighting, safety, and site access. After collection, the imagery is processed using specialized photogrammetry software and reviewed through our quality assurance and quality control procedures. The final datasets are then coordinated with Eagle Surveying's drafting department to support the project's deliverables. One of the most rewarding aspects of photogrammetry is watching thousands of individual photographs become an accurate digital representation that helps clients solve real-world challenges.
Real-World Applications
Aerial Photogrammetry creates a detailed digital record of visible site conditions, making it valuable across a wide range of industries. Eagle Surveying uses it for commercial developments, residential subdivisions, transportation corridors, municipal infrastructure, construction monitoring, topographic mapping, and earthwork calculations. Traditional field measurements remain essential, but they document selected points and features. Photogrammetry complements those measurements by capturing millions of additional points across the visible project area, providing a richer dataset that project teams can continue using long after field collection is complete.
Why Choose Aerial Photogrammetry?
For many projects, photogrammetry offers an excellent combination of speed, detail, and efficiency. Large areas can be documented quickly while producing high-resolution visual records and reducing the need for personnel to work in steep, congested, or difficult-to-access locations. Repeated flights also provide consistent construction progress documentation. From a single collection, clients may receive orthomosaic imagery, surface information, contours, volume calculations, and other products that support multiple phases of a project. Photogrammetry is not the right solution for every site. Dense vegetation prevents cameras from seeing the ground surface, making Aerial LiDAR Mapping the better choice when bare-earth terrain beneath tree canopy is required. Our team evaluates every project and recommends the technology, or combination of technologies, that best supports the client's objectives.
Accuracy Depends on the Entire Workflow
One of the most common misconceptions about drone mapping is that accurate data comes simply from flying a drone. Accuracy depends on every stage of the workflow working together: planning, survey control, field collection, processing, coordinate management, and quality assurance. A dataset may look impressive while still failing to meet project requirements. When each step is properly executed, photogrammetry becomes a dependable surveying tool capable of supporting engineering, construction, land development, and infrastructure projects.
A Recent Eagle Surveying Project
A recent project in Weatherford, Texas, is a great example of how Aerial Photogrammetry can support a project throughout construction. For this site, Eagle Surveying's Reality Capture Department collected aerial imagery and processed the data into a DroneDeploy deliverable that gives the client a detailed visual record of the project as construction progresses. Rather than capturing the site only once, our team will continue flying the project at selected intervals throughout construction. Each new dataset will allow the client to compare current site conditions with previous collections and monitor how the project is developing over time. One of the biggest advantages of this approach is the ability to overlay the client's site plan directly onto the photogrammetry data. This gives the client a clear visual comparison between the planned design and the conditions captured in the field, helping them track whether construction is progressing as expected. By combining repeat aerial collections with high-resolution imagery and the client's design information, photogrammetry becomes more than a snapshot of the site. It becomes an ongoing tool for construction progress monitoring, documentation, and project coordination.
Questions We Hear from Clients
How accurate is drone photogrammetry?
Accuracy depends on project requirements and the complete workflow. Flight planning, survey control, image quality, processing methods, and quality assurance all contribute to the final accuracy. When performed correctly, photogrammetry produces highly accurate mapping products for many surveying and engineering applications.
Can photogrammetry see through trees?
No. Photogrammetry relies on visible imagery, so the camera must have a clear view of the ground. Where vegetation blocks the surface, Aerial LiDAR Mapping is often the better solution for generating bare-earth terrain.
What deliverables can Eagle Surveying provide?
Depending on the project, our Reality Capture Department provides orthomosaic imagery, digital surface models, contours, earthwork and stockpile volumes, three-dimensional site models, and data supporting topographic mapping and other final survey deliverables.
Is photogrammetry better than traditional surveying?
No. Photogrammetry complements conventional surveying rather than replacing it. Traditional methods remain essential for survey control, verification, and collecting features that cannot be reliably captured from aerial imagery.
What types of projects benefit most from photogrammetry?
Photogrammetry is well suited for developments, construction sites, transportation projects, utility corridors, municipal infrastructure, earthwork calculations, and other large areas with visible ground surfaces. The best collection method always depends on the project's specific goals.
About Reality Capture Insights
Reality Capture Insights is Eagle Surveying's monthly technical blog series exploring the technologies, workflows, and best practices behind Aerial Photogrammetry, Aerial LiDAR Mapping, Terrestrial Laser Scanning, point clouds, and other Reality Capture solutions supporting surveying, engineering, construction, and land development.
About Eagle Surveying's Reality Capture Team
The Reality Capture Department combines expertise in Aerial Photogrammetry, Aerial LiDAR Mapping, Terrestrial Laser Scanning, and advanced geospatial data processing to deliver accurate, dependable project information.
- Keith Christensen — Director of Reality Capture Operations, overseeing operations, project planning, processing, quality assurance, workflow development, and strategic growth.
- Connor Fraser — Aerial Operations Manager, coordinating projects from field collection through processing and quality control.
- Cameron Lowe — FAA-certified Reality Capture Pilot specializing in Aerial Photogrammetry and Aerial LiDAR collection.
- Darian Rick — FAA-certified Reality Capture Pilot focused on producing complete, high-quality field datasets.
Together, our team combines technical expertise, advanced technology, and practical field experience to help clients make informed project decisions.
Continue the Conversation
Every project presents unique challenges, and selecting the right Reality Capture technology can make a significant difference in the result. Whether your project is best suited for Aerial Photogrammetry, Aerial LiDAR Mapping, Terrestrial Laser Scanning, or a combination of technologies, Eagle Surveying can help identify the most effective approach.
Coming Next in Reality Capture Insights
Part 2: Photogrammetry vs. LiDAR — Which Reality Capture Technology Is Right for Your Project?
One of the most common questions we receive is whether a project should use photogrammetry or LiDAR. In our next article, we'll explain how each technology works.