Photogrammetry is both an art and a complex science, and mastering it often requires learning from the experiences of those who came before. When working indoors, where GPS is unavailable and lighting can be limited, the challenges increase significantly. This blog post will guide you through the process of using the Elios 2 drone to collect high-quality data for indoor photogrammetry. Whether you're new to the field or familiar with outdoor applications, you'll find useful tips tailored for indoor environments.
The key to successful indoor photogrammetry lies in image quality and flight planning. Let's dive into how to achieve optimal results with the Elios 2.
**Image Quality**
Indoor photogrammetry relies entirely on visual data, so image clarity is critical. Here are some best practices:
- **Use 4K resolution**: Capture images at the highest possible resolution. You can always downscale later if needed. Inspector, the Elios 2 software, allows you to extract video frames as images.
- **Maximize lighting**: The LED lights automatically turn on at full brightness. Avoid dimming them.
- **Keep the view clear**: Don’t tilt the camera below -30° to prevent the cage from blocking the shot.
- **Adjust exposure**: Set EV compensation to 0. If flying near walls, face them to avoid underexposure.
- **Avoid high ISO**: High ISO increases noise, which can affect accuracy. Fly closer to the subject to reduce ISO.
- **Limit exposure time**: Keep it under 1/60s to minimize motion blur. Fly closer to objects to get better lighting.
- **Fly slowly**: Motion blur increases with speed. Avoid rapid movements and rotations when possible.
- **Fixed focal length**: The Elios 2 uses a fixed focal length, which is ideal for photogrammetry.
The **Photogrammetry Flight Mode** helps automate several of these settings, including maximizing light intensity, fixing EV to 0, reducing yaw rate, and keeping the camera angle stable.
**Flight Trajectory**
A well-planned flight path is essential for capturing accurate data. Consider the following:
- **Explore first**: Use your first flight to identify landmarks and plan your route.
- **Use a grid pattern**: Fly in horizontal or vertical lines to ensure consistent coverage. Look for linear features to help maintain alignment.
- **Choose the right distance**: Adjust based on desired detail (GSD) and visibility of guiding features.
- **Maintain a constant distance**: Consistent scale improves image matching. Use the Distance Lock feature to stay steady.
- **Ensure overlap**: Aim for 50% lateral overlap between images for better reconstruction.
- **Maintain visual continuity**: Avoid sudden changes in scene or direction that could disrupt the model.
- **Close the loop**: Revisit areas you've already covered to help the software correct any drift.
**Train, Try, and Persevere**
Indoor photogrammetry is challenging but rewarding. With practice, you’ll improve your skills and gain confidence. Remember, every expert was once a beginner. Pix4D also offers valuable resources, including webinars on indoor mapping.
This article is part of a series on photogrammetry, covering topics such as why indoor 3D modeling matters, how to use drones like the Elios 2, and how to process the data effectively.
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