Now that you understand the benefits of using photogrammetry to create 3D models of indoor spaces and how to collect the right data with the Elios 2, it's time to process that data and build your very first 3D model. In this guide, we’ll walk you through how to use Inspector to prepare your dataset for processing with Pix4Dmapper or other photogrammetry software. Then, we’ll go step by step through the process of creating your first 3D model using Pix4Dmapper. To follow along, you'll need an Elios 2 dataset, the Inspector software, and access to Pix4Dmapper. If you don’t have these yet, here’s how to get started: - **Download an Elios 2 dataset** - **Download Inspector** - **Get a trial of Pix4Dmapper** --- ### Preparing Your Data with Inspector The first step is to extract individual frames from your video and save them as images. Open your Elios 2 video in Inspector and navigate to the “Export” menu. From there, select “Export frames as images.” This tool lets you choose the start and end points for frame extraction, as well as the frequency. For a 30fps video, selecting “one image every 30 frames” gives you one frame per second—ideal for most applications. If you're flying fast or the environment has few visual features, consider increasing the frequency to “one image every 15 frames.” For Pix4D users, two processing templates are available: **Fast Processing** (best for datasets with high overlap) and **Robust Processing** (for less detailed or unevenly captured data). These templates automatically set optimal parameters and are saved alongside your images when selected. --- ### Processing with Pix4D When you create a new project in Pix4D and add the images extracted by Inspector, the software will recognize the camera model based on EXIF tags. For 4K footage, the correct model is **Elios2_2.7_3840x2160**. If you used a different tool, you'll need to manually select the camera model. Pix4D also supports importing custom processing templates (.tmpl), which can be generated directly in Inspector. Once imported, they can be reused for future projects. If you're processing multiple flights together, make sure each flight overlaps sufficiently with the others. This helps the software align the images correctly. A good rule of thumb is to fly overlapping paths with clear visual features. The more consistent the imagery between flights, the better the final model will look. --- ### Using Other Photogrammetry Software You can also use alternative software if it supports untagged images. While the camera model might differ, many tools allow you to input approximate values, which the software will refine during processing. For best results, start with a simple dataset—like an outdoor scene with good lighting and plenty of visual details. Here are the key specs of the Elios 2 camera: | Feature | Details | |---------------|---------| | Sensor size | 7.564 mm (H) x 5.476 mm (V) | | Focal length | 2.71 mm | | Lens type | Fisheye | | 4K resolution | 3840 x 2160 | | FHD resolution| 1920 x 1080 | | Photo resolution| 4000 x 3000 | Depending on the software, you may need to adjust settings like image resolution or matching strategies. These choices can significantly affect both processing time and model quality. --- ### Referencing the Model and Taking Measurements By default, your 3D model won't have a defined scale or orientation. To make measurements, you'll need to add **ground control points (GCPs)** or **scale constraints**. GCPs are real-world points with known coordinates, often measured with GPS or a total station. Scale constraints help define the model’s actual size, while orientation constraints ensure it's aligned properly. After adding these elements, re-optimize the project, then proceed to densify the point cloud and generate a 3D mesh. --- ### Share Your Work! Photogrammetry is a powerful way to create digital twins of any space. We’d love to see what you create using the Elios 2 and Pix4Dmapper. Feel free to share your models on social media using #elios2photogrammetry, tag us on LinkedIn and Facebook (@flyability), or tweet us at @fly_ability. We’ll feature your work and help spread the word! This article is part of a series on photogrammetry: - Why use photogrammetry for indoor 3D modeling? - Mining drones: Elios 2 creates photogrammetric models - Building 3D models with Elios 2: How to capture good data - Building 3D models with Elios 2: Processing data with photogrammetry software - Elios 2 tested for indoor stockpile volumetry, achieving 1 cm accuracy

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