FREE TRIAL

Five Tips for Better Drone Photogrammetry and High-Quality Aerial Data

High-quality drone photogrammetry provides important insights into rock mass stability, materials, and site conditions. The key to clear, detailed images starts before takeoff — with smart flight planning, the right camera settings, and efficient data processing, you can efficiently create well-structured 3D models. Follow these expert tips to get the most out of your drone imagery.

1. Plan Your Ground Sample Distance with the Smallest Features in Mind

The finer the details you need to capture, the more important Ground Sample Distance (GSD) becomes. GSD determines the real-world size of a single pixel in your image and serves as a key input parameter for flight planning. It should be chosen based on the smallest rock mass features or fragments that need to be measured.

Since flight altitude is the distance between the camera sensor and the object surface, it directly influences GSD. Altitude adjustments must also account for focal length and sensor pixel size to maintain the necessary resolution. Higher altitudes increase GSD, reducing detail, while lower altitudes improve resolution but require more images to cover the same area. Planning your flight altitude and camera settings around this ensures that even subtle features are recorded accurately.

2. Improve Efficiency with the Ideal Flight Plan

The way a drone moves during a flight affects image consistency and how much effort it takes to capture the photographs. A few key planning steps make a difference:

Use the right overlap settings: Drone cameras capture images at predefined intervals, both along the flight path (interphoto distance) and between adjacent tracks (intertrack distance). Maintaining 80% forward overlap and 75% lateral overlap ensures seamless reconstruction with having all details captured (Figure 1).

Figure 1. An example of a flying grid, where Dp is the interphoto distance (Dp [m] ≤ 0.2 . #pixels Y . GSD [m]) and Dt is the intertrack distance (Dt [m] ≤ 0.25 . #pixels X . GSD [m]).

Choose the ideal flight type for your drone survey: The area of interest determines the optimal flight plan and camera angle. Nadir flights (vertical view) alone work well for low muck piles, where height variation is minimal and a grid flight pattern provides sufficient coverage.

For rock slopes, bench faces, and very high muck piles, oblique views are necessary to create a complete model. To tie in oblique images, adjust the camera angle to capture the surface effectively, fly frontal to the face, and use intermediate tracks with adjacent camera angles of less than 30°.

Figure 2. This example of a manual flight at a bench demonstrates how to combine one nadir track with multiple oblique views. The green pyramids indicate camera positions, ensuring complete surface coverage and reducing blind spots.
Figure 3. A visual example of the proper setup for angular changes and tying in oblique views.

Proper flight planning reduces the risk of missing key features and ensures a more reliable dataset for geotechnical analysis.

3. Adapt Your Drone Flight and Imaging to Local Conditions

The success of your drone survey depends also on how well you adapt to environmental conditions, from dry or tropical areas to high up in the mountains. Factors like terrain accessibility, weather, and lighting can significantly impact image quality and resolution of the final 3D model.

To maintain sharp, high-resolution images, reduce the drone’s flight speed in challenging conditions. This helps prevent motion blur, especially when surveying steep rock faces or uneven ground. Adjusting the camera’s f-number (aperture) based on lighting conditions ensures proper exposure, whether you’re working in bright sunlight or low-light environments.

Using your drone’s full range of capabilities can also enhance survey safety. A carefully planned flight path can help you capture difficult-to-reach areas without putting survey teams in risky situations. By fine-tuning these settings and making full use of your drone’s capacity, you can maximize the quality of your aerial data while improving efficiency and safety on-site.

Figure 4. An example of the level of detail possible in your drone surveys when using the proper settings.

4. Keep Your EXIF Data Intact for Seamless Processing

Every image your drone captures contains hidden metadata — EXIF (Exchangeable Image Format) data — that plays a crucial role in processing. This includes camera model, focal length, pixel size, and resolution. Without EXIF data, MultiPhoto (the 3D model generator available in all 3GSM software) won’t function properly.

Before a flight, check that your EXIF data is being stored and disable auto-corrections that could alter image geometry (see next section).

Figure 5. An example of the EXIF data for a photograph. Pay special attention to the camera model, focal length, pixel size, and resolution for best results.

5. Use Auto-Calibration, Not Auto-Correction

Image processing software often includes auto-correction features that adjust exposure, contrast, and sharpness, but these can unintentionally distort spatial relationships and alter your image geometry.

Instead, use auto-calibration in MultiPhoto, which refines camera parameters based on the actual imaging conditions rather than applying a one-size-fits-all correction. Auto-calibration accounts for lens distortions, sensor misalignments, and flight-induced variations.

Ready to Improve the Accuracy of Your Drone Photogrammetry?

Start applying these five tips using 3GSM software today and see the difference in your next survey! With a carefully planned GSD, smart flight paths, adapting your drone to local conditions, properly stored metadata, and the right processing approach, you can capture engineering-grade images every time.

3GSM software streamlines every step of this process, from capturing high-quality images to generating precise models with MultiPhoto’s auto-calibration and advanced photogrammetric tools. A well-planned survey will save time, reduce manual adjustments, and ensure efficient integration into your workflow.

Start a free trial of ShapeMetriX, FragMetriX and BlastMetriX here.