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Last Wednesday, November 9, we hosted a webinar titled "How to Make Survey-Grade 3D Models with the Elios 3 and GeoSLAM Connect." It was one of our most engaging sessions yet, with nearly 1,000 registrations and more questions than ever before. Due to time constraints during the live session, we couldn't address every query, so we've compiled this detailed follow-up to cover all the topics that came up.
This article is your go-to resource for answers on accuracy testing, data processing, operations, LiDAR specifics, and more. You can navigate by category using the menu below or scroll through all the answers directly.
If you're interested in diving deeper into the accuracy tests we discussed, we’ve included links to two white papers that provide full details on the global and local accuracy assessments.
For those who missed the live event, you can still watch the recording by filling out the form on this page.
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### Questions Related to Our Accuracy and Precision Testing
**Q: Is the accuracy reported from the global accuracy and georeferenced accuracy test only valid when using the silver reference pads?**
A: The silver reference pads (or reflective targets) are not required to achieve the accuracy we reported. The results apply to scans taken without targets. These targets are used for consistent feature comparison between the Elios 3 scan and a reference scan, but they don’t enhance the actual accuracy of the Elios 3’s data.
**Q: Is it possible to improve the accuracy, maybe with a scanner that has greater accuracy?**
A: Future software and hardware updates may bring improvements, though no specific timeline has been set. The latest Ouster sensor offers better precision and range, and upcoming GeoSLAM upgrades could allow for non-rigid registration of GCPs, potentially improving accuracy.
**Q: Is the accuracy error of Flyability due to the flight or the device capabilities?**
A: The error comes from several factors: sensor performance, mapping algorithms, flight technique (such as speed and coverage), registration method, and how target centroids are measured.
**Q: The flight time for the Elios 3 is 8.5 minutes but the accuracy results shown were based on three flights—so how is the accuracy based on one flight?**
A: Each 8.5-minute flight captured the entire asset, and each scan was analyzed individually for accuracy.
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### GeoSLAM and Data Processing Questions
**Q: Can I create a textured mesh out of this data?**
A: While GeoSLAM doesn’t natively support textured meshes, other 3D tools can convert point clouds into meshes.
**Q: Would it be possible to export a timestamped trajectory and point cloud to use inside TerraMatch for time-based corrections?**
A: Yes, both the point cloud and trajectory can be exported and reprocessed in GeoSLAM Connect.
**Q: Can you combine your 3D model with picture recognition or tags?**
A: Tags are under investigation, but there's no official release date yet.
**Q: After merging multiple flights within GeoSLAM Connect, can the file be exported to Autodesk Recap Pro? Or can GeoSLAM Connect mesh the point cloud?**
A: The file can be exported to E57 format for CAD use. With GeoSLAM Draw, you can also mesh the point cloud or export to CAD formats.
**Q: Is it possible to obtain data on displacements of production walls over time, how many pre-coordinated points should be?**
A: GeoSLAM Connect includes a Change Detection workflow. For alignment, four targets are recommended if using the new target georeferencing workflow.
**Q: Can I generate a colorized point cloud?**
A: The point clouds from GeoSLAM Connect are colorized using LiDAR intensity values, which give some texture but aren’t real RGB colors.
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### Elios 3 Operations and Best Practice Questions
**Q: How can we receive training to develop skills to not only fly the Elios but to learn more about case use scenarios?**
A: Flyability’s AAIM training covers various use cases. Learn more and enroll here.
**Q: Is there a way to use a tether system for recovery of the drone?**
A: Tethers are generally not recommended except in specific environments like silos, due to the risk of tangling.
**Q: How does it behave in underground mines if it flies below sea level?**
A: The drone operates well in underground mines, even at altitudes as low as -3,000 meters. At high altitudes, special precautions are needed due to lower air density.
**Q: We want to map culverts, some of which are quite long. What is the max distance with the Range Extender? How far can the Elios 3 fly from the pilot?**
A: In straight lines, the drone can fly up to 500 meters, but symmetrical environments like sewers may challenge the LiDAR.
**Q: Is it possible to integrate another type of sensor into the Elios 3? Which protocol can I use?**
A: Currently, no third-party sensors are supported, but the Elios 3 has a second modular payload slot for future integrations.
**Q: Can I capture images with Flyability's drones? What are the images' resolution?**
A: Yes, the Elios 3 captures 12MP images with strong lighting.
**Q: Can the drone be bought without the LiDAR payload?**
A: Not currently, but the LiDAR can be removed if not needed for certain missions.
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### LiDAR Questions
**Q: What is the distance limit of the LiDAR?**
A: The maximum detection range is 30 meters, but for high-accuracy mapping, we recommend flying within 10 meters.
**Q: What is the file extension of the LiDAR?**
A: The raw data is saved in .bag format. After processing, it can be exported to .las, .laz, .ply, .txt, and .p57.
**Q: How many points per second does the LiDAR sensor create?**
A: 300,000 points per second.
**Q: Is the LiDAR single or multiple return?**
A: The OS0 LiDAR is multi-echo and returns the strongest echo.
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### LiDAR Data Collection Questions
**Q: How do you control the Elios 3’s flight speed during data collection to keep it constant?**
A: In Assist mode (ATTI), the drone will not exceed 1.5 m/s, making it ideal for LiDAR data collection.
**Q: About pipe inspections (very similar features in the travel), how can I prevent a wrong SLAM result? Can you give me some additional recommendations for best practices?**
A: Pipes with few features can be tricky. Keep visible geometrical features in the field of view, and consider flying sideways to maximize the LiDAR’s side FOV.
**Q: Would it be possible to control the scanner field of view used to create a point cloud in GeoSLAM Connect now or in the future? For example, if you only want to use the button 120 degrees from the scanner?**
A: This feature hasn’t been explored yet, but it’s something we’re keeping in mind for future development.