OpenDroneMap can generate a calibration file called cameras.json from a small sample flight. To mitigate this effect, there are a few options but the simplest are as follows: fly two patterns separated by 20°, and rather than having a nadir (straight down pointing) camera, use one that tilts forward by 5°.Īs this approach takes longer than traditional imaging, pilots and teams may apply this technique to a smaller area and use the collected data to optimize future flights. James and Robson (2014) in their paper Mitigating systematic error in topographic models derived from UAV and ground‐based image networks address how to minimize the distortion from self-calibration.īowling effect on point cloud over 13,000+ image dataset collected by World Bank Tanzania over the flood prone Msimbasi Basin, Dar es Salaam, Tanzania. Automatic or self calibration is possible and desirable with drone flights, but depending on the flight pattern, automatic calibration may not remove all distortion from the resulting products. Temperature changes, vibrations, focus, and other factors can affect the derived parameters with substantial effects on resulting data. mesh-size should be increased to 300000-600000 and -mesh-octree-depth should be increased to 10-11 in urban areas to recreate better buildings / roofs.Ĭamera calibration is a special challenge with commodity cameras. texturing-data-term should be set to area in forest areas. Using this flag will increase runtime and memory usage, but may produce sharper results. ignore-gsd is a flag that instructs ODM to skip certain memory and speed optimizations that directly affect the orthophoto. Decrease this value for a higher resolution result. orthophoto-resolution is the resolution of the orthophoto in cm/pixel. Your computer is running out of memory, what can you do?.Are there other licensing options aside from the AGPLv3?.I want to build a commercial application that includes ODM.If I use the native version of the software, how can I allocate more resources for processing?.The software is not using all of my CPU cores / memory / GPU all of the times.Can I process two or more orthophoto GeoTIFFs to stitch them together?.Getting Started with Distributed Split-Merge.What Are Cloud Optimized GeoTIFFs (COGs)?.Why would one use a particular Camera Lens Model?.
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